No engine power in a 350 mag MPI. from snotty days to days on the pacific when its like a lake. They are the most common motorized method of propelling small watercraft. I drive a 98 vtir manual prelude. Bow thruster. thank you for any help. The engine starts easily and idles fine with the normal response in power from idle up to WOT. but WOT only gets to 3900 rpm and 21 mph. For example; Detroit diesels are notorious for having no oil pressure at low/idle RPMs. Runs great otherwise and there is no hour meter on this boat or tach. Low rpm on 454. The bow comes down in less than three seconds on the hole shot now and stays down no matter what the speed. I'm usually running in the 47 range @ WOT. of fresh 87 oct. Electrical System. We normally cruise at less than 1,500 rpm to conserve fuel and relax, but I have no worries running at 3,000-3,200 rpm for extended times (other than my wife's comments at the fuel dock). Car engines can't. RPM at WOT is about 4000 with 3 people and a fulltank of gas. From marine electrical and electronics systems to plumbing and sail handling, this is the place to find it. Evinrude * WOT RPM Range Chart; HP/Model Year Wide Open Throttle RPM Range* BOAT DEALER RESOURCES. question is, at WOT i can only get 4850 rpm. If my boat has more drag because of its length, weight, or any other factor, then that reverse energy would impart a higher opposite force on the prop causing more strain on the engine and therefore less RPM. Current Great Ouse river safety license. You mentioned in an earlier email that you run your Cummins 270Bs at 2250 RPM. I boat on Bartlett Lake in AZ which is at about 1,600 ft elevation. The boat's motor will still operate and function as it should, but the lack of a connection between the propshaft and propeller blades drastically reduces the boat's top speed. There no difference in rpm or boat speed at 3/4 or wot but at wot the motor has more of a growl rather than a high pitched 2 stroke whine at 3/4. Once the correct propeller is selected, the engine will run at wide-open-throttle within the recom­mended maximum RPM range. Cruising is very relaxing at 15-20 mph. Takes me about 30 minutes to get to the ocean if I obey all the no-wake zones. I have a 94 Sea Ray 240 BR with a 350 mag and alpha one. Lowest prices & largest selection of Suzuki Outboard engine propellers. my boat is really heavy. Vary the trim angle for optimum performance. Which tells me the decrease in RPM's at normal WOT is due to the increased drag from my hull bottom condition. Doublecheck the tach and post speeds (from a gps) and the RPM. >How could you run your boat at wot all the time because there isn't >enough lake or smooth conditions on an ocean to pull it off. If you have any questions, please email or call us at 425-353-0436 ***Please consult your engine manual for the manufacturer's WOT RPM's as this chart is only a rough guide. The boat has been flawless (nearly) and perfect for us, it is an ocean boat for the west coast but I use it inland on the lakes in British Columbia Canada. With a heavy load of three anglers, tackle, ice, and 60 gallons of fuel the engine turns 5850 RPM at WOT. I am also pushing low rpms. Re: Low RPM, time to repitch impeller? Mon Aug 03, 2009 1:14 pm I don't think you want to do the dist. Normal maximum RPM = hull problem. need help from idle to WOT my boat stalls at about 3000 rpm's for 1 to 2 seconds but recovers and runs fine, also runs fine the rest of the time. My girlfriend who doesn't know the first thing about the car even noticed yesterday -- "where's the pull?" she said. You can partially compensate for this decrease in performance by carrying a second prop with reduced pitch, making it easier for the engine to achieve the correct rpm at WOT. Engine RPM Chart for Proper Boat Propeller Sizing. Without a tachometer, the operator has little opportunity to know if the engine is at a dangerously high or low rpm level. the right height on the boat? If it is too low there will be. Not a Mirage plus. These numbers seem low with what I expected but I did have close to a full tank of gas, bottom paint and was a. Prop dimensions (# of blades and pitch) 8. It would drop 300-400 RPM and come back. With our wakeboarding boat we rarely exceed 3000 rpm. Often people put on extra large props for fuel economy. 3 Measure using an accurate service tachometer with engine at normal operating temperature. You get a little more out of it in white water probably because your getting some air. I can cruise at 3200 rpm and get 12 mph. 3: Yamaha WOT RPM Range Chart* - Solas Boat Propellers Wide open throttle RPM range chart for Yamaha powered boats. The engine is mounted in the lowest position/top hole. Re: Indmar Vortec rebuild low RPM List of possible causes of low WOT (Wide Open Throttle) rpm. Prop Selection is probably the most over looked aspect of making an outboard perform properly. 4600 RPM is way too low; your boat's performance will suffer unless you can allow more RPM. With the 14x18 prop the boat gets up on top quickly and hits 25mph without having to listen to the engine scream plus it gives me great manuverabilty and steering maintenence at low rpm. If the actual WOT RPM's are above the recommended RPM range, install the next larger pitch option to decrease your WOT RPM. As I slowed down the rpm a. Current Great Ouse river safety license. The decreased RPM would result in less engine output force and therefore a slower boat. The boat gets out of the hole very quickly and I find it hard to believe that I still need to move up in pitch. mercury 90hp 2 stroke rpm, rpms on a 60 hp mercury outboard, what are the rpm for 90 hp for mercury, what is rpm of 90 hp mercury enging, what is the operating rate of a 90hp mercury?, wot rpm range 90hp mercury saltwater serier 2 stroke, youtube boat motor 2002 mercury 90 hp 2 stroke getting it ready for the water,. 28-29 psi at wot drinking gas 200 rpm loss 250 pro xs low slung cruiser. In the above scenario, a stock transmission might be used that would provide a 1. For every inch you go "up" in propping, you can figure about a 200 rpm drop at WOT, and the reverse is true as well. I get somewhere around 6100 RPM WOT running around 39-40 MPH. Although I'll be new to cruising, every boat I've ever owned had that certain speed/RPM where the ride was comfortable and the GPH was about the best it was going to get, for that speed. Propeller pitch or diameter, damaged blades 3. Transmission gear ratio 7. 4MPI low rpm WOT Hi I recently purchased boat from title and it was doing 27-30mph (depending on trim) at 3200rpm WOT, It did run very strong. Octane of fuel 9. I have a Alumacraft Dom sport with a 90 on it. This 2001, 40 hp Yamaha is made for saltwater. by pass at WOT that will mess with your advance that is for timing at an Idle but I could be wrong if so I stand to be corrected. The boat is not loaded down with a bunch of stuff, just me and the wife, a bag of ice in the cooler seat, fishing poles and sometimes our 2 young grandkids. How many RPM's are you turning at wide open throttle (WOT) with 2 people in the boat? If you are turning less than 5200 RPM's at WOT with 2 people in the boat, high probability is that the pitch on your propeller is way too high to allow the motor to rev with a heavier load and it is laboring. I have a 20 Foot Crestliner with larger 24″ pontoons. I've run at 6400 RPM and never got a beep, let alone a shut down. i would like to put a 3 blade propeller but need to know what diameter and pitch I need to get. Anything else you want to add that may make performance different It will be interesting to see how boats with. The number that you have now arrived at is the number of RPM you need to raise to maximize your boat's wide open throttle RPM range. Compare and save at FindersCheapers. how many models of the 250/300 v8 are there? base 4 stroke, sea pro, pro xs, and 250/300R correct? where can I find the tq and hp numbers for these engines? Im ready to put new engines on my 32 manta cc, the boat will spend most of its time hauling 22 passengers to and from Cartagena to my island hotel. Pretty sure Yamaha tested without a hardtop and I have one, so I wouldn't expect my numbers to be the same as advertised anyway. The boat is a 2007 Maxum and only had 26 hours when I bought it so it has been sitting around quite a bit the past few years. At this rpm the thing is hitting about 46-48 mph GPS verified. So with that said I run the boat by pyro and fuel burn. 0), prop pitch (the distance that a propeller would move forward in one revolution), prop slip (the efficiency of the prop, lower at high speed, but perhaps very inefficient at low speed) and the boat speed in mph. Without a tachometer, the operator has little opportunity to know if the engine is at a dangerously high or low rpm level. The answer is that once you know what RPM you are getting at WOT, you have a pretty good idea as to which changes you need to make to get into your recommended RPM range. prime, wot rpm yamaha 225, yamaha 200 hpdi low rpms, yamaha hpdi does not reach top rpm, yamaha hpdi low rpm at wot. 4l EFI Bridgeport can anyone help me with what propeller to run on this setup. If you don't have a tach you need to take it to a marine dealer to make sure that it is has the right prop. Propeller pitch or diameter, damaged blades 3. Check that the inner throttle cable is properly clamped and that you get the full amount of throw on the govenor regulator handle and check the outer cable is securely clamped. I don't have GPS to confirm speed, but I know the rpm is outside my upper limit. In neutral it will rev to 5500 rpm but I notice when we are going down the lake it only gets about 3300-3500 rpm. I get somewhere around 6100 RPM WOT running around 39-40 MPH. Takes me about 30 minutes to get to the ocean if I obey all the no-wake zones. 4 hours ago · At such low altitudes there was the added danger of bird strike. Times and dates in your local timezone. when cruzin at say 4k rpm, raise the trim (drive) slowly. if the tranny cks out, brakes, catalytic converter and 02 sensor. I have a difficult time getting up on plane if there are 2 people on the boat (both guys between 160 and 200) until one guy walks to the front (or sits on cooler up front) then itll jump up on a plane no problem. I can see the tach move about 100 rpm when it starts missing. Almost sounds like it's gettin too much fuel at wot but no spark advance to process the fuel. Pontoon Boat & Deck Boat Forum I trimmed up and down but just lost speed both directions so that was as fast as I could get it at WOT. I noticed last year that I was getting low RPMs WOT while boating at Union Valley Reservoir just south of Lake Tahoe. After the new fuel cooler and injectors I was up 4000 rpm, but still missing about 600-700 rpm. com) that lay this out in a logical way. Even at WOT, you can hear the drone in the exhaust. Faria Rpm Gauge Price comparison. that I habe owned the boat. 4 I/O New Topic On my last boat I would get slower and slower through out the season at the end of the season I would empty the boat to. Octane of fuel 9. For example; Detroit diesels are notorious for having no oil pressure at low/idle RPMs. The reason that I ask is if tyou changed it out yourself, you probably have some pre- and post- change information that you could share that I'd love to get my grubby mitts on. 0L MPIs and I was wondering what the most likely cause of this could be. Not a Mirage plus. Took the family out fishing and my boat started to surge after I got it up on plane. 4 NMPG at a slow cruise. 5 mph and a range of nearly 250 statute miles at 3500 rpm and 28. 3 different dealers have looked at it and still happens. The RPM's should not exceed 5500 RPM's. being under or over propped) or you may simply want to gain better fuel economy. Be sure to do your testing under your normal boating conditions and with a good propeller (not bent, cracked, or excessively chipped). Your boat may not have trim though I would think a Century would. 7 mercruiser engine miss at hi rpm; 5. The dealer said that is a little low but really did not justify the cost of buying a new prop to gain 300 to 400-RPM at the top end. I did the timing belt 30K ago along with new plugs and coils. The motor height looks fine. It does run a bit better in the cooler times of year, but nothing significant and no difference in RPM's that I've noticed. So if you're hitting the rev limiter running the boat light as you normally do, you have two options. 3 On average accel I get upto 2-4PSI and at WOT under dp-tuner econo80 I get about 10 PSI. Although I'll be new to cruising, every boat I've ever owned had that certain speed/RPM where the ride was comfortable and the GPH was about the best it was going to get, for that speed. Does these numbers sound healthy to you? It is not because I dislike a low fuel comsumption B) but I would like the setup to run at its best. The change in feel is immediate. Initially the engine rpm is low and as the boat speeds up rpm goes up (or the other way around). these are literally the most under stressed simple V8s that exist. No engine power in a 350 mag MPI. Without a tachometer, the operator has little opportunity to know if the engine is at a dangerously high or low RPM level. This may be comparing apples and oranges here, but with my older prostar 351 I am getting 39 MPH @ 3900 RPM with an Acme 543. My Merc 60 hp four stroke has a max recommended RPM of 6000. We didn't buy the boat with the idea that it would be a speed boat but it feels sluggish to me. Part of the process involves running the vessel at full, or wide-open, throttle—what engine manufacturers often refer to as WOT. Changing to a 4 blade and dropping pitch from 21P to 20P I expected similar wide open throttle (WOT) RPM between the 2 props. I keep an eye on the rpm and while the boat is on a semi-plane I start easing on the throttle never allowing it to go above 3800. The conditions I boat in and my personal preferences usually have me cruising at 3200 to 4000-RPM. Cruising performance since to be OK at 3600 rpm and 15 gph and about 20-25 mph but again with trim tabs down. Only pulled 105 speedo @ 7900-8000 on a corrected tach. With the 14x18 prop the boat gets up on top quickly and hits 25mph without having to listen to the engine scream plus it gives me great manuverabilty and steering maintenence at low rpm. Learn more about this unique design and what it can add to your boating enjoyment. I beleive its called leaning out the engine. We help you save hundreds and sometimes thousands of dollars on outboard motors, powerheads, lower units, outdrives, gear cases and more! Warranties available!. Transmission gear ratio 7. 5x19 s/s prop on it, which is the manufacturers recommended size, but it would only go up to ~3400-3600 RPM WOT with a top end speed of between 36-41 depending on water conditions and weight in the boat. This was with two on the boat, and VERY full of fuel. This model has a recoil starter and power steering. question is, at WOT i can only get 4850 rpm. 4 GSI/DP Volvo Penta, 454 engine 1998 27 foot Doral, well last week I idled out of the bay which it ran just fine for about five miles then I pulled back to do a little trolling, after an hour I decided to pick it up and move to another spot and noticed that I couldn’t get on plan or accelerate over 2. Current Great Ouse river safety license. Re: Only getting 4200 rpm @ wot??? Don't know if you figured this out yet, but I work down on base (Pax River) and I know a BM2 who maintains the mercruisers on their port boats. Boat weight around 6000 kg. Type and Octane possibly old fuel 2. Boat gets WOT, no smoke?? Can't see any problem here apart from the readings! You're getting max rpm, even if it was at lower boost (Which is unlikely) so the engine is giving you the full beans. I put 5 gals. I remember someone posting about this years ago. My Merc 60 hp four stroke has a max recommended RPM of 6000. I saw little value to subjecting my engine to 5,000 rpm if all I accomplished was rpm with no increase in speed. Boat is in the water so I can’t verify prop size currently. Nice European design. Aboard the Ocean Prowler we will take you on an unprecedented coastal journey along the edge of the Tasman Peninsula, only 1 hour South of Hobart, with the option to snorkel with wild marine animals in their natural environment. my 2001 50hp mercury outboard at low speed skips and cuts out and then comes back' motor runs fine when igive it power,it only does it when i click in gear and low speed trolling. Typically, a one. How many RPM's should a 50cc sunny scooter turn, mine will only go 6200. This 2001, 40 hp Yamaha is made for saltwater. 57 mph @ 5600 rpm (gps). Numbers seem very low to me though? 2001 7. Fuel consumption was around 24 GPH @ WOT. Low rpm on 454. Sunseeker Predator 57 boot te koop, Motorjacht, Overig, € 1. We normally cruise at less than 1,500 rpm to conserve fuel and relax, but I have no worries running at 3,000-3,200 rpm for extended times (other than my wife's comments at the fuel dock). I noticed last year that I was getting low RPMs WOT while boating at Union Valley Reservoir just south of Lake Tahoe. A tachometer is necessary to determine the WOT RPM. Low WOT RPM - Merc 7. Boat & aircraft engines are quite de-tuned, they're meant to develop low/mid range torque v. Ive got a mercury 60 hp outboard and usually at full throttle I would see around 5000 - 5500 rpm and a speed of 30 -35 however recently when reaching 5000 rpm the boat would do about 15I was told it was a bad hub my mechanic said they didn't have the hub in stock but could put on a brand new prop that I guess comes with a new hub?? no ideaanyways they put the new prop on and now the. The tach is slightly fluctuating between 1500-17oo RPM's but even with the throttles fully advanced the engine will not go up to WOT. A good start for a stock propeller would be about a 14x17, (three blade). My understanding is that I'm now running about the correct speed/RPM for the boat, I'm just a bit concerned about the low WOT. 3:1 a/f) for supercharged engines to start. The high pressure fuel pump is in the tank. Basically 0 cavitation/ ventilation and she picks up and goes quick. 0L TKS idling and low rpm problems I bought my Maxum just about 6 weeks ago and have been using it around 25 hours during this time. There is no need to rev it past 4200-4500 rpm. With a 12:1 prop, Idle to WOT will take longer for the engine to come up to max RPM's (if at all) than a 10:1 prop. Someone suggested that the High RPM's may be a sign of a low compression issue, possibly caused by worn valve seats. It's a 5 speed, and has god knows how manny censors and such dead in the engine, but at just under 200k miles, I'm lucky it's running. Get whisker to whisker with super cute fur seals and other fascinating wildlife, above and underwater. Page 2- New Boat- WOT speed, RPM and water temp questions Engine / Drive Train One low reading but it is within 10%. the right height on the boat? If it is too low there will be. Only got 3400 RPM and reached 29 MPH. Forum adverts like this one are shown to any user who is not logged in. If RPM's are at the upper end of the range with a 3 blade prop, use a Revolution 4 of the same pitch. I noticed though, with 50 gallons of fuel, driving into the wind, with 2 people on board I am only going 30 MPH @4600 RPM. I had done my research on the verado but failed to understand the rpm operating range requirements (yes, shame on me) Anyways, when at the shop getting oil changed I was informed the engine was making oil. I currently have a high five propeller 13 1/2 diameter 25 pitch on it and it is doing 67mph wot at 6300 rpm. Rpm Bowfishing Price comparison. - set fuel in the low to mid rpm/any kPa to the desired lambda - predict fuel in unvisited cells - set timing to MBT in the above cells - predict timing in unvisited cells - sweep tests at the lowest boost to get correct timing at WOT - increase boost and new sweep tests till a limit is reached. VP indicates WOT around 4800 - 4900. You can partially compensate for this decrease in performance by carrying a second prop with reduced pitch, making it easier for the engine to achieve the correct rpm at WOT. I'm usually running in the 47 range @ WOT. question is, at WOT i can only get 4850 rpm. A month ago I took my boat out on a 300NM journey and only got 1. -no black or white smoke at WOT loaded or unloaded (a little stem above 3000 but nothing excessive). Im new to the forum thing so hopefully Im not hijacking any other post. this seem realistic to you guys. The engine is mounted in the lowest position/top hole. An under pitched prop would lead to higher RPMs, not lower. Information on this page is provided to you as a free service of iboats. Never a problem. com, the #1 full featured boating site in the world. That way, even if calculated load at WOT is relatively low at low RPM, the target ratio remains the same. 0 mercruiser high rpm wide open and over heat; 350 magnum fuel cooler engine running hot at 4500 rpm; 350 magnum mercruiser overheats only at low rpms; 350 mercruiser boat overheating at high rpms; 350 mercruiser rough running at 3600 rpm; 5. If with a light load at 1900 I'm 700 degrees exhaust temp and 21 gph that's how I run the boat with a full canyon load. I put it on with minor tension. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. 75" below the pad. thank you for any help. Also, newer motors go into "safe mode" if they sense a problem (over heat, low oil, etc. My 2004 232 BR with 350 MAG B3 has developed a miss at 2500 to 3000 rpm. Once the correct propeller is selected, the engine will run at wide-open-throttle within the recom­mended maximum RPM range. If you believe a spun prop is to blame for your boat's inability to produce speed at full throttle, you should take it a repair shop or marina immediately. The full throttle RPM chart shows WOT RPM for: Evinrude / Johnson, OMC, Honda, Nissan / Tohatsu, Volvo, Yamaha, Suzuki, Mercury / Mariner, & Mercruiser. from snotty days to days on the pacific when its like a lake. I'm with Muskie on this one. Welcome to the Internet's premier site for boat motors! This site is part of iboats. #1 PERIOD is WOT (engine RPM at wide open throttle) most engines have a 400 to 500RPM window at maximum RPM. I am reading on the internet I should be closer to 6000 RPM and 40 MPH with that setup. Two-cylinder motorcycle engines are often set around 1000 rpm. Twin MAN 680hp diesels. On my 2001 4788 (tel:2001%204788) I have been experiencing problems with speed, WOT RPM, and fuel economy. I have a '92 Mariah with a PCM 5. Why are Wide Open Throttle (WOT) RPM so important? As I have mentioned in a previous blog post, what WOT RPM you are getting along with your current propeller size and pitch are the most important numbers for us to determine which props you can and should be running on your boat. Boat is used for offshore fishing. I tried several props and now I am pulling 5,600 RPM at WOT and 18 mph on the speedometer and 15-16 on the GPS with three people on-board. View Profile. The boat has been flawless (nearly) and perfect for us, it is an ocean boat for the west coast but I use it inland on the lakes in British Columbia Canada. After breaking it in for about 1. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components. If you don't have a tach you need to take it to a marine dealer to make sure that it is has the right prop. The boat has been flawless (nearly) and perfect for us, it is an ocean boat for the west coast but I use it inland on the lakes in British Columbia Canada. will i damage the motor running it at this rang. Re: Low rpm problem at wot Bullet At Pioneer Marine in Tampa (now defunct), somewhere in the 1980's, a brand new 70hp or 75hp (I forget which), straight out of the box, just installed by the riggers they couldn't get it running properly worth a damn and called me to check it out. It is a six-cylinder, two-stroke outboard motor with a maximum rpm of 5500 at wide open throttle, a spline count of 15 and a gear ratio of 1. Each inch of pitch size will change the RPM by 150-200 RPM. Re: Low rpm problem at wot As far as your question to if I have oversized Pistons, it's been 4 years since I got the power head I truly don't remember but I'm assuming so, I do remember it was sold as a complete remanufactured not a rebuild. The prop is still the factory one from 96, with very minimal wear. In the past this boat ran just shy of 75mph GPS @ about 5800 rpms with the same prop etc. Forum adverts like this one are shown to any user who is not logged in. have now the VP 4. I ran the boat for the first time at WOT and hit 4500 rpm against a range of 4400-4800 and GPS speed of around 42 mph. I had done my research on the verado but failed to understand the rpm operating range requirements (yes, shame on me) Anyways, when at the shop getting oil changed I was informed the engine was making oil. 7L 250 All 4400-4800 1. I've thought from the first time out that the throttle itself seemed a little far "forward" even at low to mid rpm range (i. The dealer said that is a little low but really did not justify the cost of buying a new prop to gain 300 to 400-RPM at the top end. Boat & aircraft engines could easily be modified to spin faster than the factory makes them, but problems occur when this happens. My idle rpm went up to around 2000, when before it was around 1100. The high pressure fuel pump is in the tank. Note: WOT (wide open throttle) measurements are made with a tuned engine, a clean boat hull, loaded with an average boat load, and the propeller clean and undamaged. WOT @ only 5000 rpms. Re-test the WOT RPM. Converting miles per hour into inches per minute results in the number 1056 used in the formula. Flat bottom hull in case you wonder about that. Before I would start to chine: 25" ProSeries : but not bad. Type and Octane possibly old fuel 2. Learn more about this unique design and what it can add to your boating enjoyment. Powered with an Evinrude 300 E-TEC G2, the Robalo 246 Cayman had a WOT speed of 46. An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. Fuel injection, low fuel pressure can cause loss of power all the way though RPMs. If they want it to have maximum bottom end and mid range power, they port is so the peak power band is low in the rpm range. RPM at WOT is about 4000 with 3 people and a fulltank of gas. The main forward cabin has. Unfortunately the boat is on land so I will not test it out until spring. 0L inboard at WOT however the last few weeks we have had declining performance to the point that we can only get to plane at 15 knots with someone in the v-berth for weight. I get somewhere around 6100 RPM WOT running around 39-40 MPH. if the tranny cks out, brakes, catalytic converter and 02 sensor. 3 engines, WOT is 4000 @ 58 kmph. Motorisatie: 2 x Volvo 2 x D13. In no particular order Engine Won't Reach Operating RPM. Told me to try running at WOT for 15-20 min at the end of each trip to burn off fuel. In the above scenario, a stock transmission might be used that would provide a 1. The valve trains are good for 5500, and the rest is fine at those low RPMs as well. Both are low on rpm at WOT and have been since I've owned it (9 months). 23:1 reduction gearbox. any info. Bought the boat in May, and test drive boat ran great. In the process of putting engine back together the ESA unit was faulty, replaced that, then with the new carb, would not start, no fuel. My best guess is that I'm having some cavitation while accelerating from lower speeds at full throttle where rpm's were high despite a relatively low boat speed?. thank you for any help. Any thoughts on this odd problem are welcome: We used to have no problem popping out of the hole and up to 26knots in our 5. At WOT the engine will sporadically rev up to normal RPM for a few minutes and then bog down again. The boat came with a 40 hp Honda and it was fairly slow. Damworker, sir - Is that the impeller that your boat came with or did you change it yourself? I'm just curious, since sub 4K RPMs at WOT seems very low to me with a 350. Michigan Wheel, Solas, Turning Point, Stiletto, Quicksilver. Low max RPMs is a common symptom of propulsion problems. if you park it after waiting awhile it would be back to normal, about a month later it was then having a no fuel pump prime situation where it. - Ran it fully trimmed out in the bay on flat water with 4 guys, gear , bait and ice Easily hit 6K at WOT was running 44 MPH. The engine starts easily and idles fine with the normal response in power from idle up to WOT. A serious student of the Honda outboard, Jacoby knew exactly what I was talking about when I mentioned a bogging BF90, and had some advice for BF90 owners: Get the revs up: "The BF90 needs to be propped to run 6000 rpm at wide-open throttle, and that's with a full load of fuel, gear and passengers," said Jacoby. 0L TKS idling and low rpm problems I bought my Maxum just about 6 weeks ago and have been using it around 25 hours during this time. BTW- a lot of waterlogged boats don't get that way sitting in the. Volvo * WOT RPM Range Chart; HP/Model Year Wide Open Throttle RPM Range* BOAT DEALER RESOURCES. the 15X15 with an aggressive cup gives me the best performance on the water. At WOT the rpms will typically peak out at 5650 (sometimes the high 5500's to very low 5700's) with a top speed of about 38 mph via gps and spinning a Yamaha Saltwater Series II 15. Often people put on extra large props for fuel economy. Learn all about boat propeller fit with our Boat Propeller Fit Guide. I have a 135 on my boat and I have ran it at WOT for more that 3 and 1/2 hours up the inter-coastal water way before and had no problems. It was clean. These other sellers have cap. The subsequent sea trial produced 4100 rpm WOT. Diesel Engine Overload: Wide Open Throttle Measured by RPM. Check that the inner throttle cable is properly clamped and that you get the full amount of throw on the govenor regulator handle and check the outer cable is securely clamped. 3 On average accel I get upto 2-4PSI and at WOT under dp-tuner econo80 I get about 10 PSI. At 5000 rpm engine speed, the prop would be turning 3300 rpm. Boat gets WOT, no smoke?? Can't see any problem here apart from the readings! You're getting max rpm, even if it was at lower boost (Which is unlikely) so the engine is giving you the full beans. Boat spec: Length 50" / 127 cm Width 18" / 46 cm Weight 25 lbs / 11 kg Engine rpm 12-13k. 7 mpg for a maximum range of 149 statute miles with a 10% reserve. speed and rpm im new to the site and a new baja owner. Checked the cable connection at the carb and realized it wasn't opening up all the way. Wot rpm too low. as for running the engine at WOT, these engines are so under stressed and such a low RPM, its not an issue. 7L 300hp motor in a 20 foot boat. It sounds fine it only gets up to about 8. Both are low on rpm at WOT and have been since I've owned it (9 months). Current Great Ouse river safety license. I say approximately because the tachometer doesnt work and top speed at wot is 22 knots which would be around that rev range. haven't taken it out yet hopefully it runs more RPM's or at least the same as with the MSD. Re: RPM at WOT too low? (Mercruiser 3,0 TKS) Per the info you posted, and assuming that all of the adjustments in the linkage are correct, and the engine is in good working order (i. When you combine all these factors, you have the information you need to select the correct propeller for maximum performance, safety, and fuel efficiency. Should the rpm be higher than that. The engines were just overhauled and for some reason they will not turn up to 2300 rpm at WOT. Fuel condition. The book says rpm at WOT should be 4400-4800. 7L 250 All 4400-4800 1. If I don't do that my max WOT-RPM reaches 3850. There no difference in rpm or boat speed at 3/4 or wot but at wot the motor has more of a growl rather than a high pitched 2 stroke whine at 3/4. Adjust how you load the boat for the best performance you want the bow of the boat to come up a little at first when powering to WOT and then plane out nice and level. ethanol gas in the boat's tank. Max Speed at Wide Open Throttle 3. Compare and save at FindersCheapers. 3 On average accel I get upto 2-4PSI and at WOT under dp-tuner econo80 I get about 10 PSI. Restricted fuel pickup tube or anti siphon valve Fuel System Test 4. 7L 300hp motor in a 20 foot boat. How bad is low rpm 5th gear pull? After about 3 weeks of having my new OBP '12 WRX hatch (and with a lot of patience) I finally passed the 1k mile break in period after work yesterday and wanted to get a good feeling for how the car accelerates.