[Question] flywheel
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flywheel

  1. #1
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    Default flywheel

    I currently have a 454 big block and the previous owner was running a flexplate. when starting the boat I was getting a grinding with a shwing noise after doing some research and asking around I was told to not run a flexplate in a jet boat. Went and got a flywheel and now my issue is the bellhousing is not mounting flush to the block. I was then told to get a marine flywheel. being I have 14" diameter and was told I needed 12". Does the diameter change the width of the flywheel because what I have now is the face of the flywheel hitting the top mount of the bellhousing where the starter would be located. Do I run a marine flexplate or will the 12" marine flywheel solve my problem? And where is a good place to order it from?

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  3. #2
    Senior Member cyclone's Avatar
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    I've never run anything but a flex plate in my jet boats.

  4. #3
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    Thanx for replying man I really appreiciate it. Where would you get one from and what's a good name? I use Cp performance here and there. what I was affraid of is if the width is the same on the marine fly wheel i'd prob half to replace the bellhousing too. should I try shimming the starter to stop that noise? The starter isn't over throwing the flexplate though its having trouble engaging it. So I grinded the face down of the starter about 1/16" to a 1/8" of an inch and it engages alot better but still get a miss here and there. So I was told a flywheel would solve the problem?

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  6. #4
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    You can use either a flywheel or a flex plate, and most likely 168 tooth. If you have a quality starter and flex plate or fly wheel, shimming the starter should not be needed. May run into a problem changing from one to the other, with the thickness between the two. Could create a problem with the shaft distance to the bearing of the pump or a fit issue with the spline.

  7. #5
    Senior Member jetboatperformance's Avatar
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    Good Info above but to add and agree , we typically use flex plates (preferably SFI) when possible and practical , when switching between to two (flywheels Flex), the type of engine "balance" may be a critical factor , also consider like suggested that flywheels and flex plates utilize distinctly different PTO's (power take offs) and or drivelines (depending on the type driveline itself) As for your starter issues , check the depth engagment of your starter pinion carefully for clashing or binding , if your not certain feel free to Pm I will explain how Tom

  8. #6
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    Default Flywheel and starter

    What type of starter are you using?? There were hundreds of Mini-starters on the market that were machined wrong. We race in the SDBA and were plaiged with starter issues in 2009 and 2010, went thru 4 starters and 2 flexplates. Our supplier discovered the problem and stopped selling the mini 3hp high torque starters until the issue was resolved. Now you buy one from them and they guarentee it for life, racing or whatever. Even though it cost us a championship then, we have had no issues since, always run a 168 tooth flexplate [SFI].

    Good luck - noisy starter= bad mesh and trouble on the way!!

  9. #7
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    My friends boat had a flex plate that was out of round, caused major starter problems. New flex plate fixed it.

  10. #8
    Senior Member carreradude's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Good Info above but to add and agree , we typically use flex plates (preferably SFI) when possible and practical , when switching between to two (flywheels Flex), the type of engine "balance" may be a critical factor , also consider like suggested that flywheels and flex plates utilize distinctly different PTO's (power take offs) and or drivelines (depending on the type driveline itself) As for your starter issues , check the depth engagment of your starter pinion carefully for clashing or binding , if your not certain feel free to Pm I will explain how Tom


    X2 on the SFI flexplate useage!! I run one as well. Stock OEM flexplates tend to wobble due to no torque converter bolted to them. SFI's are thicker. Useing a flywheel is good for mellowing a cam to allow a lower idle (long duration). BUT, if you unload that pump at max RPM with a heavy flywheel, when the pump re-loads, that heavy flywheel wants to keep spinning and loads the crank pretty hard! Could be bad!!

  11. #9
    Senior Member Sweet Pickle's Avatar
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    The Mezeire flexplate is the best to use. It is one piece super heavy duty and true. Call them direct

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