Oh, the boat had a half tank of gas when i got it too, which more than likely was old. Sign in with Twitter. AutoAnything offers FREE SHIPPING & One-Year Lower Price Guaranteed on Subaru Standard Crate Engines. The calculator will automatically compute the 5 th variable. Then, I made my homemade Jet Boat, that was very cool and I did a video about it: But the motor was a brushed one, so the lipo batter…. So they are pitched a little high to prevent it from exceeding the top RPMs on a light boat. That's why, IMHO, Hamilton wasn't worried about the 212's tendency to drop in efficiency over 4,500 RPMs - it didn't really matter, anyway. (High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min. Too much oil can result in problems as well - oil spraying out of various orifices or getting into other places where it should not be like the combustion chamber. Run your boat at WOT 3. Find the perfect Abba 1977 stock photos and editorial news pictures from Getty Images. A kinked or pinched hose can cause significant performance problems in an outboard engine, especially at higher RPMs, while pinholes in fuel lines can introduce air to the fuel, as well as create a safety problem. series are performance engines to the max. Discussion RC reciever output to arduino Homebrew Hacks for Model Boats. Your WOT RPM operating range is 5000-6000, and you should be in the second half of that range at WOT at trimmed for best RPM. Michaels, Maryland to Hilton Head Island, SC October 2018. But I also think your measurement is off due to the angle the motor is sitting versus the boat. I would like to know if anyone has experience with these engines and if running them at 1800 rpm at 170 degrees is ok, they do load up a little and I like to run them up to 2200 rpm to blow em. i pulled the trottle body off and cleaned it and all the senors. Check for too much ignition advance. I know you put the motor in base timing mode and in gear to set the idle at 650. 3 L Cobra 5200-5600 2. Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. Put your car or truck in 1st gear and drive e it all week long. There is no power until around 6500 RPM and my engine never revs higher than 7200 rpms? No torque. You can have it identified at a propeller shop, or if you can read a part number order that way. what is : 6" jackplate: a realistic top speed for this combo? PS. Shop currently working with Honda to see if they can figure it out. Re: High RPM on start try checking worn cables and linkages. General Q & A - Water pressure too high? - When the boat is idling Im getting a menial 1-3psi water pressure on a mechanical gauge at the helm However, once I get up higher in the RPM it really gets high and actually pins the 30psi gauge once over 4000RPM or so!. But many aircraft engines are geared to slow the engine RPMs down such that the. If no improvement, repeat until desired results are achieved. Checking air supply is easy: Run the boat at high rpm, say, 200 below maximum. The high temps started the first day I launched the boat this season, I was just going from the ramp to my slip for my other boat a couple hundred yards away and it went up to 200 for a few seconds. I noticed last year that I was getting low RPMs WOT while boating at Union Valley Reservoir just south of Lake Tahoe. my boat came with a cleaver, but I changed it to a standard SS 3B to drop my rpms and I Gained about 1 mph at 200 less rpms when I did. this seemed to clear up after a few minutes, i assumed it was air in the fuel line, then we docked the boat and the starboard engine put up an alarm. Passenger Cars, Mini Vans, SUV Service and Repairs. Fuel temperature (at the engine’s fuel inlet fitting) and the amount of vacuum required by the fuel pump to draw the fuel from the boat’s fuel tank can contribute to vapor locking. I don't think it will be caused by a choke unless the butterfly is allowed to fluctuate on and off. Jet Ski & Motorbike services, repairs and modifications. 5 tonnes (7718lbs), maximum payload 1158kgs (2553lbs). I have twin mercury 8. Boats that are troublesome to get on plane, underpowered or used in watersports where top speed is not critical perform well with four-blade props. You should be running at least 37-38 and hopefully 40 mph with the engine trimmed up where the boat's nosecones are out of the water. The handling of the Trophy was really good too. Check the fuel filter or filters for water and drain it before you start the engine. Replace the housing too, not just impellers. And when you say "throttle down" that would indicate that it's droppng in RPMS so how many RPMS is it dropping? Could be boat isn't propped correctly, engine height could also be wrong. 4 merc 2001 mag mpi motor. a 125cc machine that routinely lived in the 10,000 - 13,500 rpm range ran 20:1 or 24:1 -- The 250cc engines that ran between 6,500 and 9,000 rpm ran 32:1 or 40:1, and the Open Class machines. having so issues with my boat. If the boat has been driven for a long period of time or at high speed, allow the engine a two-to-three (2-3) minute cool-down period at low idle (600-800 RPM). Since we bought it new, our 2006 2. All are lakeside and The Black Pearl at Blackjack Cove and Anchor High are Floating Restaurants. Some say that the motor is too high, wrong shaft length etc. At 5200 RPM at WOT I am getting about. This throttle is a must have for safe operation of high performance boats. There were lots of ups and downs, some grades were 14%. Upon starting the engine it needs to run for about 5 minutes before it will generate any more RPM´s than idle speed. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1. All run on 87-octane fuel. I now iac has 12. Normally it is best to attain speeds near to hull speed without too much load on the engine. With so many bits and pieces to examine and maintain, figuring out what’s wrong can take some time. I used to be able to go around 50mph running I believe was 4500-4800 RPMs. here's one for ya. I am currently using a SS 10 pitch prop. CRSED - CRSED: F. A hydraulic pump is driven off the cam shaft of the main engine which powers the helm sending fluid to the twin cylinder steering quadrant in the rudder room. AutoAnything offers FREE SHIPPING & One-Year Lower Price Guaranteed on Subaru Standard Crate Engines. RPMs too high at full speed, trim up. Re: RPM too high at WOT Based on figures given & 1. Un-tie the string and allow the rpm's to come down. Joel van Houdt for The New York Times. How could I get the car to pass a check without paying a fortune to get it repaired? Is there anything I could do?. Homelite pressure washer manual Photo: 50statesclassifieds. I just ordered a 16 ft aluminum fishing boat and plan on putting a 75 hp e tec on the back. I do make sure the boat is loaded right with people up front too to help get the nose down. Engine RPM Chart for Proper Boat Propeller Sizing. Here is the key, make sure you reach 3850-3900 rpms at WOT. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions. Pre-ignition can be caused by too much spark advance or too low octane gas. These are governor settings for an unloaded engine hence the word "idle". For gasoline-powered boats, you're looking at around 3,000 to 3,500. Also, due to the jobs. diesel locomotives) 350 to 1200rpm. The volume of the column of air described in Step 2 is pi (3. Almost toooo fast. Before you know it, your boat engine starts acting up and your day of fun is over. When it comes to boat polishing and automotive detailing, this is a highly-regarded tool with plenty of positive boat buffer reviews. I’m having a small issue with the idle being a bit high on this f115lb. I am not over propped, that for sure. In our next column, we'll look at how some of the available prop options - aluminum vs. Injector sizing becomes limiting as well with a TB. My strategy on my custom boats is actually to target the lowest possible RPM with the largest prop that will still result in good handling. I was water testing a boat yesterday on the river and noticed 10mph difference and 1000 rpms difference between zero trim and max trim. I don't have a jackplate on my Waterman, but it does have a slightly elevated transom. Today, in outboards, the four-strokes are beating two-strokes in. 4200 is too low. Many things including :- * Worn crankshaft bearings * Oil pump failure * A lack of oil * Low oil pressure due to worn crankshaft,camshaft bearings or a worn out oil pump or the pressure relief valve is sticking open * General fatigue due to weak c. Shop online or Call (800) 544-8778 to order today. What's wrong??. Are the props cavitating when you first start out and rev up to 5600-6000 rpms? Did you get a chance to try starting with the motors tucked in to hold the bow down and "pop up" the stern? How about with the tabs down on the takeoff? Still need to get those rpms up on top-end, too. braking keeps going, so I miraculously slide over in traffic to a side. Turns out some boat builders are letting transom height get closer to 21 inches or 26 inches. Here’s my question. Discover better boating: Active Trim by Mercury makes boating easier and more enjoyable by automatically. less slippage at the same rpm means more speed. 0 in a 17 or 18ft boat are around 40 mph Your 30 mph I think indicates issues other than prop selection. Browse our catalog and please contact us directly if you can not find the high performance alternator for your application. Too high of a pitch prop will cause the boat to take off slowly when you go full throttle from a standing start. Outboard engines come with 3 lower unit lengths; 15", 20" and 25" for example. In a 645f7b engine instaled in a fishing boat and this engine activate the crankcase pressure detector switch after rise the 900 rpm we have checked all the normal but we cant find the soluti?. Recommended fuel/oil ratios from 10:1 to 100:1. Extreme changes to the angle of the bow on the move, combined with sea conditions. In high speed level flight, thrust from such a propeller can drop too low to overcome drag long before the plane has reached its designed flying speed. I have lost 3. It has the Volvo 5. Cruise at 4500 RPM or slower. The 26" Laser II sucked, 23" Mirage carried the bow really good but top end was non existant. Too much pitch will limit the engine from reaching its peak rpm for maximum speed. A prop that is easier to turn requires less effort from the motor, so the motor is able to reach higher RPM. 5 inch of pitch. o A high load (high pitch and/or diameter) on an engine will result in lower engine RPM. Mount the outboard unit in a test tank or on a boat well secured. 0L is 4400-4800RPM. Daytona 27' with a 525 I have a modified ECU so I spin that at 5700 in the low 80's so I called BBlades and he said that 27' is really a 26' so that makes more since to me/ He just made me a Lab 28 I tried and it RPMS too high too. but I spend more of my boating time at 5-10 mph cruising around. Once a hub is spun, there generally remains enough friction to operate at low RPM –sort of a “get home” mode. 7LX Alpha 1, 19 pitch high five will top out at 38mph gps with a good load ( 2adults 2kids full fuel, water, beer etc. Bites much better. The 16x16 is too big (rpm's too low) for my boat and the 14x17 is too small (RPMs too high). If I am lighter I will usually see about 42mph. I want to try a 25" prop and drop engine: Even with pad. Get contact details and address | ID: 22544865955. HELP!, Optimax RPM too high @ idle In the beginning it ran great, I had an older remote control for it (1984) but it was fine. While I wait for the tool, does anyone have any ideas on why disconnecting the TPS sensor allowed the boat to accelerate ( Tach is running very high for some reason so I don't know how many RPMS I was running at). My problem now is that both motors idle at about 600 rpm's. But, the voltmeter is WAY to high. Lots of rainy days ? Engine that needs a minute of cranking to start & run steady You need to be on plane with no appliances running to catch up on short 10 to 15 minute out & back runs. While watching the tachometer, have a crewmate open an exterior door and an engine compartment hatch. 8 L V4 Sea Drive 5000-6000 2. Also, 1800kv on 6s is actually a bit too high RPMs. Elevation - If you regularly run your boat at different altitudes, you know the importance of using boat props with a different pitch to match your engine performance. I maintained 75 mph the whole way dropping to 4th on the grades. That said, I really like the overall performance of the DWP849X buffer, especially its ability to polish multiple boats at the same time. I'm looking for some guidance when it comes to towing and RPMs. Some have rejected these and so have shipwrecked thier faith". Took the Merc 15 (2002 2-stroke) our after a few weeks of not using it and it was working fine, but about 3-4 minutes into my runs at WOT, the motor will jump from 5200 to 5800 RPM and slow down considerably in speed. That is the right height. Engine RPM at W. 22" Merc Chopper was pretty good all around and had the best slip at 10%, but I was only getting 70 mph at 7000 rpm. You'd probably need to raise the motor a bit too to allow more boat out of the water at top speed. 1S horizons. Plug in your info, and click "Calculate" on the item you want to compute. For surfing our boats wake, we select the throttle position (RPM) to give us the desired boat speed. A misfire will cause the engine to momentarily stumble or lose rpms and then regain its normal engine speed. If you want speed, getting a speed boat-hitting water at higher speeds isn't very safe and handling stability is more important than high speed. Homemade Brushless R/C Boat ---Revolution---: My favorite R/C vehicle is actually Boats! Most of my R/C boats were very slow and had a very bad radio system. In this article we will break down each parameter. Sometimes this can be fixed by turning the selector switch on the back a few times, wiping the contacts internally. If it's five years old, 250 is about right, and so forth. I am thinking that a 19" Vengeance or LaserII prop would get the RPMs up and help with holeshot but before I go ahead and find one I just wanted to know other thoughts. high engine temperature conditions, in both pre-mix and injection systems. boat loaded pulling a wakeboarder. Been a while) But we started working with a 25 pitch 3 blade stainless and had a guy the dealer knew tweet it until we got the 5600 rpm at full trim. As well as providing propulsion, outboards provide steering control, as they are designed to pivot over their mountings and. May 3, 2012 - Seven Marine is no longer producing their 557 and 627 outboard engines. An Allison SS 2000, one of the most beautiful performance boats you can buy, can’t run any of the big block engines, they’re just too heavy. #6 · Sep 18, 2012 (Edited) A lower RPM peak HP engine will require a bigger impellor helping the hole shot. The ideal propeller torque should be about 70-85 percent of the top RPM of the engine. We tested each boat propeller “light” (just the tech on board) and “heavy” (with 350 additional pounds in the boat), always with the 60-gallon fuel tank full. Each inch of pitch size will change the RPM by 150-200 RPM. The boat is slow out of the hole with the ballast full, and 5+ people on the boat. Ignition problems stemming from the distributor cap, rotor, ignition wires, or spark plugs can cause a high idling issue. Engine idle speed is the speed, measured in revolutions per minute (RPM) an engine is designed to run at when the engine is fully warmed up and the vehicle is stopped in park or neutral. Just purchased 2013 24' Avalon Windjammer tritoon with lifting strakes on inside and outside of all three 25" pontoons. It was showing 5,000-5,500 rpm, whereas the engine sound and boat speed were more consistent with something a little over 3,000. Three-blade props are generally best for recreational boats with three-, four- and six-cylinder outboards. So, keep idling to a minimum. WOT RPM's too high I just bought my first boat last week, a 1993 Diablo 180 with the 4. Replace the housing too, not just impellers. After picking up speed, when I thottle back down and go into neutral, the motor RPMs are WAY too high. The Kodiak is designed for, which includes a lot of hauling, it tends to be a slower-paced quad compared to its counterpart. The calculator below uses the above formula. Step 1: Slowly bring the control lever to the neutral position. With the price of fuel today, this is an important piece of information and we would like to be as accurate as possible. But I also think your measurement is off due to the angle the motor is sitting versus the boat. Gelcoat has little structural value but gelcoat protects the hull and gives it its color and shine. 5 rpms and climbing, I. 5-feet squared) times the column length in feet. 05m) Extension 84-825003A1. I do make sure the boat is loaded right with people up front too to help get the nose down. You want to use a pitch that gets you as close to 6000 as possible with just you in the boat. Or if the mounting holes in the transom are too low or high. I have a Yamaha 40, 2004. 383 CID B Big Block Engine. It is a 2004 VLX. hard shift [Archive] - Boat Repair Forum. 2 in a continous rhytm at idle or in stopped position. These include: Overload: Too much. The cruising RPM for your Yanmar is 2000 -2800. Its a 17P, and I really have to rev the motor to get it moving, have plenty of RPM and will redline easy. 172 Engine Power Limited Engine power is limited. Centrifugal advance comes in at around 950-1000 RPM and is all in by 2000 RPM. The idea is to give some added boost at the transom, the area where boats with hole-shot problems frequently "squat"as power is applied. Changing the pitch of your prop will change the boat's. I am far from an expert on. So if the head is too big it will be very lazy. This may not be all that common, however, brushless motors can fail. But so can a tin boat with a 30 hp tiller steer outdrive. I Have tried every prop acme has sent and every prop OJ recommended. It is not always easy to diagnose the cause because there are so many factors involved here. But many aircraft engines are geared to slow the engine RPMs down such that the. Coming back from a weekend trip recently my port engine alarm went off and the message said I was running the RPMs too high. Get contact details and address | ID: 22544865955. I replaced the thermostat today as the rubber had cracked. If motor is too high, why would the problem go away with an increase in speed, I was thinking the problem would be worse at higher speeds. 0 L Model 400 4200-4600 1. Getting it right will allow you to enjoy your vehicle for years to come. No bigger than your boat is an aluminum prop should get you there without throwing a ton of cash at props. Does anyone know what the Max RPM range should be on my 2008 F225TLR 4 stroke. Shop online or Call (800) 544-8778 to order today. Heavy boats require more throttle to reach the same rpm as a lightly loaded boat. They customize their vehicle day after day so that they can drive at speeds of up to 270 MPH. Prop selection for this scenario is relatively straightforward. Batteries are getting too much charge. In the summer of 2001, a Norwegian freighter, the MV Tampa, rescued 433 asylum seekers, almost all of them Afghan, from a stranded fishing boat. When traveling uphill, if I were to maintain the speed limit of 65 mph, my RPMs would go as high as 4,000. The rpm you run your engine at, as long as its within reasonable numbers (below the redline) is probably the least contributing factor to abnormal/increased engine wear. As a rule of thumb, remember that the lower a propeller's pitch, the higher its rotations per minute, or RPM. Step 2 - Using the engine oil dip stick, check the oil level of the engine and ensure a proper level. View Details 225 HP Mercury 225XL V-6 4-Stroke DTS Cold Fusion. The high temps started the first day I launched the boat this season, I was just going from the ramp to my slip for my other boat a couple hundred yards away and it went up to 200 for a few seconds. All run on 87-octane fuel. WOT RPM's too high I just bought my first boat last week, a 1993 Diablo 180 with the 4. If an engine has the fuel mix ratio blended for sustained high-rpm flat-out running, than running it at a partial throttle at a lower rpm is going to increase your changes plug fouling, gumming up a ring, etc, though with modern oils, they are pretty tolerant of being run with too much oil for a given rpm range. 5 knots), normal max rpm under load is over 3100 rpm (which will normally drive the boat at just over 6 knots) At 2700 RPM thick black smoke would come out of the exhaust, if I backed down to 2500 RPM smoke went away and speed woud drop to 4 knots or so. You must have the boat in the water, running water through the motor at high RPMs. Can trim the motor all the way out now and never blows out, holds turns at 40. Talk to other owners of your boat and. Seems to work OK but I don't think it has the thrust at RPM of the original, though. prop is not spinning on the hub, pulled the hub out tonight since the prop uses separate hub. This would be 3. Windows 7 Forums is the largest help and support community, providing friendly help and advice for Microsoft Windows 7 Computers such as Dell, HP, Acer, Asus or a custom build. Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. Excessive RPM is usually caused by air entering the pump. Step 2 - An engine's tune up is a regularly scheduled service, when this service is neglected it can cause the engine to surge. They are simple to get to because of the center console. so looking for more top end speed and the right prop for this boat. Don't miss what's happening in your neighborhood. In 1996, this same model boat set new. You can cruise at a lower speed if you want to conserve your fuel, at around 3000 to 3500 RPM. The 16x16 is too big (rpm's too low) for my boat and the 14x17 is too small (RPMs too high). I attributed this to the altitude (4,870 ft. First, the engine has to work harder to get that high pitch prop spinning, meaning the boat will suffer from slower pickup. I now can barely hit 30MPH and revving at 5200 RPMs. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1. 6V92 engine questions. 20-04-2010, 07:01 # 5. In high speed level flight, thrust from such a propeller can drop too low to overcome drag long before the plane has reached its designed flying speed. are done with the maximum timing screw and idle timing screws. Difficulty Scale: 5 of 10. We have done it in the past using a mechanical latching relay, and maybe that is the best way, or maybe there is a better solution out there. Yeah it can pull one adult water skier or wakeboarder or knee boarder with 2-3 in the boat. 9 mph @ 5,766 rpm. Count them find you the blades, our items from boat owners who first to the fouling. I hope to gain a little more top end performance with the new SST prop. BenQ M300. Simply lower the rpms to the lowest setting to obtain the low speed needle valve adjustment. Sometimes it's not just the big prop that makes the boat get all weird. AVOID BOTH! Don't worry so much about too high an rpm as VARYING the rpm. Today almost any engine has a cutt-off so it is impossible to over-rev under normal use. Acceleration and sterndrive or register to maintain and engine rpms too. In that time the boat has always been used on the same lake, parked at our private dock, and stored winters indoors. It is a culmination of years of study and research into high volume pumping systems and their effects on a small boat's stability, controllability, dynamic loading and righting moments. If it was my boat I would get the cavitation plate equal too or slightly higher than the bottom of the boat and stay with the 15 degree prop. However, my N/A 572 BBC peaks at 5800 RPM and still pushes the boat to 110mph. The Correct Prop Pitch Because there’s always a tradeoff between acceleration and top speed, finding the correct propeller pitch will depend on how the boat is to be used. Unfortunately at idle, the calculations are small and may not show a big difference until at higher rpms. 5L OptiMax 150 Pro XS. Re: RPM too high at WOT Based on figures given & 1. Top Speed of almost 70 MPH! Cruise speeds. The current prop is 13. Lugging the engine, i. Find the perfect Abba 1977 stock photos and editorial news pictures from Getty Images. Getty Images offers exclusive rights-ready and premium royalty-free analog, HD, and 4K video of the highest quality. but in my experience I've found that a worn water pump or impeller might shift enough water through the system at low rpm, but struggle to keep up with the demands of the engine when it turns over faster. Ventilation occurs when surface air or exhaust gasses are pulled into the boat propeller blades. Boneyard Beer: Must stop - See 135 traveler reviews, 42 candid photos, and great deals for Bend, OR, at Tripadvisor. Running too many rpms. so looking for more top end speed and the right prop for this boat. Is this a boat without much in it? 21ft would normally be out of range for 50 HP. i pulled the trottle body off and cleaned it and all the senors. having so issues with my boat. October 9, Tuesday. when im pulling my trailer im usually shifting at about 3,000 vs 2,500 when not towing. The 75 is a 3 cylinder compared to the 60's 2 which I believe would make the 75 a smoother running motor. Mount the outboard unit in a test tank or on a boat well secured. Ten years later, in 1958, Strang was working for Mercury, while it was being led by its founder, Carl Kiekhaefer. At this rpm the thing is hitting about 46-48 mph GPS verified. This would be 3. Calcs show about 13% slip. 174 Fuel System Fuel Pressure is low. 4,000 to 5,450 rpms no issues at all. 25 square feet x 800 feet = 628. What give's ??. enging would die. Debunking Five Common Diesel Engine Myths. 12-27-2005, 01:28 PM #3. Marine engine s are made to withstand more rpms. It is not always easy to diagnose the cause because there are so many factors involved here. The 26" Laser II sucked, 23" Mirage carried the bow really good but top end was non existant. Seems to work OK but I don't think it has the thrust at RPM of the original, though. If it’s five years old, 250 is about right, and so forth. 6 L Sea Drive 5000-5500 1. It is running at 900-1000 rpm when warm. Divide rpm by volts- in this example, 3600 / 1. These high strung motors do not like high motor timing. The motor is what powers the boat so the two go hand-in-hand. With the engine well warmed up, bring the boat quickly up to peak rpm and observe the peak rpm numbers. Almost toooo fast. (from the boat speedo--i dont have a gps--yet). Mercury engines are not like car engines, which are optimized to operate at low to mid-range rpm. The steering system was manufactured by HydroSlave in Rockport Main, and has been a rock solid, high performing system on our boat. I hope to gain a little more top end performance with the new SST prop. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1. The 6L80 has a maximum RPM limit of 6500 RPM. After that the engine was normal, idling at 7-800 rpm and we took it for a test run. Contact your local dealer or consult your manual for optimum RPM ranges for your engine. Thanks for the replies, both. 0 Replace the propeller. Get contact details and address | ID: 22544865955. Acceleration will be slower as well. 5 L Sea Drive 5000-5500 1. So if your engine should rev to say 5,000 rpm but you can only achieve 3,000 rpm then the pitch is too high. I replaced the thermostat today as the rubber had cracked. Oh yeah, your WOT (wide open throttle) RPM for the 96 3. I want to try a 25" prop and drop engine: Even with pad. QUICK FIX: Ream the tell-tale, from the outside in. Before you know it, your boat engine starts acting up and your day of fun is over. I dont feel something is right. You need to compare the current performance against that target in order to determine how (IF) you can tune better. posted by SmogTips Support. Obviously I do not want to burn up the motor but I would like to drive it a bit. It can provide an early warning to potential engine problems, and it. Need a new propeller for your boat?. Remove the fuel cap to drain the old fuel. TROUBLESHOOTING AND DIAGNOSTICS 90-883065 APRIL 2001 Page 3B-3 4. I have a 3 blade Gori folder (15"x9") at 3000 rpm run at about 6. If it reaches full rpm at much less than full throttle, the prop is too small and the engine revs will be unnecessariy high for a given boat speed. Also consider that the faster you spin an engine the fast it is going to wear out. A prop's pitch is similar to an airplane wing as well, with high and low pressure sides. Show Boat: Directed by George Sidney. If it's five years old, 250 is about right, and so forth. Too little pitch will result in engine revving past its recommended rpm operating range. Check Engine Light MIL. I don't normally motor at that rpm its to noisy, normally around 2500 rpm. I used to be able to go around 50mph running I believe was 4500-4800 RPMs. com your online source for high output alternators. I think your meter is off. That said, I really like the overall performance of the DWP849X buffer, especially its ability to polish multiple boats at the same time. The lowest shifting RPM for 2-3rd gears is 1090 plus/minus 200RPMs so the inspector wants it set at 890RPM for the engine cut off speed which is about idle speed !Not sure if it will even start when its colder because the choke will be on and that makes the RPMs too high. Be patient. Again, we're assuming, in the interest of customer service they performed otherwise. By doing this, you will be looking at what the tachometer sees for power and ground, combined. And, it is likely that you are seeing the tach register 2,000 RPMs between shifts, not 20,000 RPMs. Just one tach is about 2500 - 3000 rpm's higher but both motors are running at the same tone if that makes since. Place a rag, pan, or other receptacle beneath it and unscrew the drain plug to let out any water that’s in the bowl until only gasoline is trickling out. Full throttle engine rpm too high 1. 250R & 300R FourStrokes. Getting it right will allow you to enjoy your vehicle for years to come. CRSED - CRSED: F. I suppose you could go to a 4 blade prop (choose carefully) and take weight off the boat (you'll likely easily find 100-200 pounds). In that time the boat has always been used on the same lake, parked at our private dock, and stored winters indoors. F****n joke for a $38,000 dollar brand new "8 person" boat with a wakeboard tower. Voltage and Current. I can manually push the bottom lever backward and the throtle speed goes to normal. A 2001 Mercury Racing 2. Contact your local dealer or consult your manual for optimum RPM ranges for your engine. Another vacume switch noise then drops the RPM to 700, finally! This blows, but the dealer has told me twice it's normal. The 383 Super Commando was a slight performance upgrade producing. Comes with pre-balanced Compressor Wheel & Turbine wheel, intake nozzle, Diffuser, Nozzle guide vanes, axle guide, vapor t…. Another possible cause is an air leak in the fuel line. 5 tonnes (7718lbs), maximum payload 1158kgs (2553lbs). Only in outboard motor operation does the speed remain fairly constant. The 13p prop brought the RPM up too high, at 6100 and the speed went down so we definitely know that is the wrong prop for this application. Check out these 10 simple solutions for the most common boating breakdowns. Having been introduced to the world at the Paris Motor Show last October, the Ferrari California Spider can now be admired on our roads, too. I outran a Triton TR19 w/175 'Rude: 60 mph @ 6000: who had GPS'd his boat @ 68. prop hub slippling / cracked hub / or if rubber hub - worn - slipping. I started with the high rpm and worked to the low rpm. The 1966-1967 383 had a 10:1 compression ratio. Free Shipping on all orders over $50 — Learn More; 813-925-7127 | Orders | My Account. My second post: The third tube is a 27" sport tube, all tubes have lifting strakes. Same boat and motor. The engine and propeller should be matched so that at full throttle, preferably in fairly smooth water, the engine reaches that rpm, or perhaps at least 90%. Presence of Dirt and Debris. Yeah it can pull one adult water skier or wakeboarder or knee boarder with 2-3 in the boat. Since than I have tested the fuel pump, changed the fuel filter, and rebuilt my Holley 4160 carb. Alright heres my situation. If boat is new to you and you have eliminated the other possible causes, it might be the carb was set up for automotive use, at 3000 rpm unlike on the street, the pump cams might be too far up the ramp to give a good shot, you'd have to watch where on the cam the accel pump arm is at speed to catch that, or perhaps the spring loaded actuater. RPM is a measurement of how many revolutions a computer's hard drive makes in a single minute. Acceleration will be slower as well. Its a 17P, and I really have to rev the motor to get it moving, have plenty of RPM and will redline easy. The propeller centerline depth below the plane surface is 3 1/2" paralell to the plane pad surface. Speed increase not: 60 mph @ 6100. I was right, it was running slow. Im trying to figure out why my boat is turning such a high rpm BOTH while accelerating up to plane and at top speed. Your motor's max WOT range is 5500-6000. Application of Using Low Timing. But, when RPM is increased, the engine revs with little or no boat acceleration because the prop begins to spin. Quartz Associates - Offering Sencan Electric Car Polisher 7inch, Model Name/Number: 701804 in New Delhi, Delhi. If motor is too high, why would the problem go away with an increase in speed, I was thinking the problem would be worse at higher speeds. We found the large face tach and speedo both to be extremely accurate (within 5% or better). No chainges. Different pound thrust motors with equal RPMs will achieve an identical top speed, this is because RPMs are limited by the amount of Volts which are applied to the speed coil. Sign in with Facebook. Calcs show about 13% slip. The dealer says the heavier engine causes it to ride low and that does seem to be true. The Life Expectancy of the Marine Engine The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. This would be 3. Shop online or Call (800) 544-8778 to order today. One prop gives decent hole shot but puts rpms too high and another struggles to pull a skier around turn island above 23mph at WOT. The 383 B block, or "low block", has a 4. i pulled the trottle body off and cleaned it and all the senors. The rpm total advance is reached is determined by the big spring. street, put the transmission in neutral and the RPMs go to 5 and which. I changed to this prop because my prop was danaged and the engine rpms where too high, and this was by far the best idea yet, the boat has all around better performance!! would highly recommend for a replacement!!. I have a P mono that I race that has a bit too high of RPM for my liking. With Kathryn Grayson, Ava Gardner, Howard Keel, Joe E. 5200 rpms at wide open throttle is about 1,000 rpms too low. As I posted, if the RPM at idle is higher than about 700, you may need to look for tightness/mis-adjustment in the throttle cable. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. I replaced the thermostat today as the rubber had cracked. A 5 out of 5 stars (5) 5 product ratings - New Pro 3 HP 3450 RPM Air Compressor 60 Hz Electric Motor 208-230 Volts U. Comment on: Topic 'Stalling Crusader Engine Diagnosis Part 1'. See with a race engine, it hits around 15,000 rpm, so they have a much wider power band. 1-800-705-2215; Contact Us; Home. is probably the smallest you should try. Below are the top causes that a mechanic would look for. Increasing the pitch is what gives you more speed. This is a classic too high of an engine situation. But fuel economy can, too, since you should be able to attain a given speed with lower RPM. Here’s my question. Find professional Rpm videos and stock footage available for license in film, television, advertising and corporate uses. Be patient. But this is nothing new to the boat, I've been running it this way since 2015 and never hit the limiter before. This depends mainly on your needs and the boat's hull speed. Having cavitation issues at 4,000 or higher rpm. 5 is weak on the bottom end of the rpm range, the PVS system lets you limit that by getting out of the low RPM end quickly. removed impellers jet housing and nozzells everythign seems normal even wear no high or lows spots on impeller housing. In addition to being more efficient, these engines produce 20% more torque from as low as 1,250 rpm. My strategy on my custom boats is actually to target the lowest possible RPM with the largest prop that will still result in good handling. Engine Sputtering or Losing Power. You can use this boat propeller calculator to determine one of five variables: boat speed, propeller slip, propeller pitch, engine gear ratio, or engine revs. The diameter of a prop decides how much water you will disturb while the pitch determines how quickly you push the water displaced out of the way. es; en; fr; Sin categoría. No bigger than your boat is an aluminum prop should get you there without throwing a ton of cash at props. When i put it into forward gear, she wanted to. You will likely feel the prop slipping at high RPM. 2014 Yamaha f115lb idle rpm too high. Follow instructions below: a. Stay away from long hills, carrying a passenger or heavy loads during break-in. If you engine is rated at 3600 rpm (max), this would be 2500-2900 rpms. 4,000 to 5,450 rpms no issues at all. Quote Reply Topic: Boat feels maxed out at 1500-1600 rpms Posted: June-15-2021 at 2:30pm Hey everyone, so I just replaced the carb with a quick fuel 600, a née fuel pump and fuel filter/water separator. Chosen Solution. Is there a clutch plate or something which can be slipping? Max speed so far is 30 MPH with 1/4 tank gas and one person (me). My 25hp EFI trolled beautifully she would get down to about 1. High Elevation. In 1996, this same model boat set new. At that time the outboard engine position was set high. With the eight-speed transmission though, this is much smoother and the vehicle is not left in the high end of the gear's RPM. The misfire will usually reappear, either under specific operating conditions or randomly. 2) RPM too low (and not undertrimmed) - low engine height and/or prop pitch too high 3) Roostertail too high (and not overtrimmed) - engine too high or excessive prop slippage (change/rework prop) There is insufficient room to list all problems and their solutions in this article. I'd like to compare it in my set up. Same boat and motor. Other applications for low motor timing is to maximize run. This helps to lower the voltage spike at the coil's negative terminal to. Read our high elevation guide to learn about the elevation's effect on the performance of your prop. Chasing a problem on a '97 Johnson 225 venom. I know the rev limiter is set at 4750 but are those RPMS too high to run the motor wot. The handling of the Trophy was really good too. I tested from a high of 2600 rpm (maximum continuous rpm for my propeller) to a low of 1800 rpm (the lowest governing speed). When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. Replace the housing too, not just impellers. They customize their vehicle day after day so that they can drive at speeds of up to 270 MPH. The award-winning boating magazine publishes several issues a year and is an exclusive benefit of BoatUS. Batteries are getting too much charge. Please help me figure out why the boat I bought about a month ago is so disappointingly slow. Engine idle speed is the speed, measured in revolutions per minute (RPM) an engine is designed to run at when the engine is fully warmed up and the vehicle is stopped in park or neutral. the cruise speed at 4000 and 4500 rpm increases by 2 knots per each 1. Also, 1800kv on 6s is actually a bit too high RPMs. leakage - oil line terminates above fluid level 1. So you try again at a 90 degree angle, this is a high pitch angle, with the full flat part of the blade pushing the boat forward. At those speeds the noise can get bothersome. Now, with the higher pitch prop, assuming that the motor is running at the same rpm, and if there is no difference in prop slippage - your boat will be running faster at the maximum rpm. either way you will need something that will measure frequency. This small instrument dial, which details the revolutions per minute of the engine's combustion, provides a critical window into the boat engine's operation. Each of these single-stage rockets could not get to space, but they were used in large numbers for scientific study. All has to do with the internal programming of the cluster. Tape off the edges as needed. 1 breakdown reason — running out of fuel). The original equipment option tends to give poor speed, acceleration and performance when used on heavier boats or when towing a skier. I tried lowering the rpm in the *****ing mode but it would not go below. too high also. They are obviously focused on surf and wake boats. really the concern, although would like to go a little over 60; water pressure is. A well known sense that defines the basis of cruise speed determination of a boat. Non‑Critical ‑ Service Engine Soon. One engine will do the manufacuture specs of 4700 top rpm. Remove the debris using carb cleaner and a wire brush. idle speed of 1200 rpm, 3 cyl. It is running at 900-1000 rpm when warm. Mercedes 280E, Smog test aborted due to RPM Too High I just attempted a smog test today with my 1981 Mercedes 280E. I don't ever make long runs and even so i rarely hold the motor wide open for very long because of the RPMS. I find speed is really dependent on your weight and water conditions. A misfire will cause the engine to momentarily stumble or lose rpms and then regain its normal engine speed. Service during regularly scheduled annual checkups or every 100 hours of operation is recommended for outboards in normal recreational usage, annually or 500 hours for fishing guides or multiple-trip-per-week recreational fishermen. A set of "ear muffs" or "flush muffs" was fitted around the engine's gearcase to cover the water intakes, connected to a garden hose with a good water supply, and the engine was run for five to 10 minutes. Someone said that I should check my powervalve in my Holley? Any other thoughts? I am running a BBC with an aftermarket aluminum intake and a Holley 3310. It cruises at 24. Idle speed, sometimes simply called " idle ", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. If the prop pitch is too high (higher in inches) the motor may run below the WOT range—called “lugging the engine”—which can also put undue stress on. Reasons for a Rough Idle or High RPM. The Tach Output Terminal produces a 12 volt square wave signal with a 20% duty cycle. I am far from an expert on. Below are the top causes that a mechanic would look for. With the eight-speed transmission though, this is much smoother and the vehicle is not left in the high end of the gear's RPM. Check fuel level. When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. the Yamaha 15p prop feels much better and no problem getting on plane. New Pro 3 HP 3450 RPM Air Compressor 60 Hz Electric Motor 208-230 Volts U. The original equipment option tends to give poor speed, acceleration and performance when used on heavier boats or when towing a skier. 11 gear set and I am curious as to what rpm limit you would cruise at on a highway trip. Boneyard Beer: Must stop - See 135 traveler reviews, 42 candid photos, and great deals for Bend, OR, at Tripadvisor. problem all but went away. I asked this same question to "Michigan Wheel" Prop manf. this seemed to clear up after a few minutes, i assumed it was air in the fuel line, then we docked the boat and the starboard engine put up an alarm. 383 CID B Big Block Engine. Voltage and Current. It is a culmination of years of study and research into high volume pumping systems and their effects on a small boat's stability, controllability, dynamic loading and righting moments. A metallic tapping that keeps time with engine rpm means your valves, lifters, or rocker arms are in trouble. Marine dynamometers are available, too — taking into consideration boat operation by simulating on-the-water operation. I bought a MSD-5 (current product MSD-6A) for my Mazda rotaty that would eat points by about 4K miles. You are now down to a WOT RPM of 3400 on one engine and 3350 on the other, & WOT speed is only 23-24 K's. I've checked on civic forums, but no one has been able to help, so i thought i would try here. Are the props cavitating when you first start out and rev up to 5600-6000 rpms? Did you get a chance to try starting with the motors tucked in to hold the bow down and "pop up" the stern? How about with the tabs down on the takeoff? Still need to get those rpms up on top-end, too. I think its a better solution than throttling the incoming water flow. Acceleration will be slower as well. Long ago, pistons were made of steel, but their great mass kept engine rpm under 2,000. gENERAL INFORMATION. Then, I made my homemade Jet Boat, that was very cool and I did a video about it: But the motor was a brushed one, so the lipo batter…. Iim reading reports of the same boat with a 225 going up to 75. This is another RPM Sports choice quality boat. the Yamaha 15p prop feels much better and no problem getting on plane. Lugger as far as I know in its 500HP+ form is a Komatsu engine. 5 SS 280 HP, the ultimate lightweight powerhouse. We tested each boat propeller “light” (just the tech on board) and “heavy” (with 350 additional pounds in the boat), always with the 60-gallon fuel tank full. I used to be able to go around 50mph running I believe was 4500-4800 RPMs. fluid level too low 3. A prop expert can suggest what pitch prop you should have based on the performance of your boat in relation to its factory-rated WOT rpm. Today I don't know. Obviously, a 7,000-rpm 572 isn't going to want the same head as a 5,500-rpm 454. The problem is many boat mechanics seem to just try different parts until something works. I can manually push the bottom lever backward and the throtle speed goes to normal. This will give greater efficiency, speed, and fuel efficiency and enhance engine longevity. The 1966-1967 383 had a 10:1 compression ratio. If it was my boat I would get the cavitation plate equal too or slightly higher than the bottom of the boat and stay with the 15 degree prop. Iim reading reports of the same boat with a 225 going up to 75. All those RPM will make it swap ends on me coming out of a turn. ] you will find them to have extreme pitch, [or advance] and be of small diameter. Engine idles too high. The Jet ski Carb for the 550 Jet Ski is a Mikuni 38 mm Carburetor. The handling of the Trophy was really good too. I took the boat out, it was a choppy 4 footer with confused wave. We have thousands of hi output alternator upgrades available that may not be listed on our web site. If the ship is shaking and growling, alter the RPM. problem all but went away. 5 knots in speed. I was right, it was running slow. 9 mph @ 5,766 rpm. Dropping the jack plate will reduce rpms and you are currently on the low side of where you need to be on rpms. With the 18. We are adding these new products to our web site daily. With the eight-speed transmission though, this is much smoother and the vehicle is not left in the high end of the gear's RPM. 1 ; 4000-5000 RPMS 161. Calculate the CFM (volumetric flow of air) at 1,200 rpm. Don't miss what's happening in your neighborhood. A reverse transom that sits too high can impact the propellers of the motor and motor bracket. Check out these 10 simple solutions for the most common boating breakdowns. Press the gas pedal and note its effect on the tachometer.