Thread: Fast Fred's OMC Mod 50 secrets Thread #2

  1. #161
    Team Member Detroit Whitey's Avatar
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    find your self a 65hp pancake flywheel

  2. #162
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    Default Flywheel mods

    For cast aluminum flywheels, most of the strength is in the skin. Cutting these down is outright dangerous unless you add a scattershield to catch the schrapnel. Ductile iron flywheels are tougher and can be cut to some degree. Any cut down flywheel should be balanced and spin tested to 1.5 times the intended operating RPM. If you need electic start, the Mod50 flexplate flywheel is the best option for you.

    Good luck!

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    Default 1972

    72 was the only year for the Pankake flywheel. 9 lbs vs 10lbs on the others

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    Quote Originally Posted by Powerabout View Post
    Hi Fred

    Do you know if the 92 70 new style flywheel is lighter and or can be modded?
    Is it diecast so we must leave it alone? They look sand cast ish?
    SST 60's didnt use I wonder why?

    Thanks
    This flywheel came out after the SST60 and it's heavier.

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    Default pancake flywheel

    The pancake flywheel will work on the 49 and 56 motors with the newer style ignition. It will have to be cut on the hub like the SST 60/ fishing 56er to allow the black trigger to clear.

  6. #166
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    Default making a flex plate

    Ok
    What do I need to know to make a flex plate for an OMC?
    Could I machine the hub out and bolt that to the flex plate and then machine out outer ring to hold the charge coil magnets and bolt this to the flexplate....or install Merc components and use one of their flywheels??

    Std flywheels are too ugly

    for $350 i would buy one but its been a while since they were that price
    Buy one and copy it to recoup the investment?
    Is there any magic in the manufacturing of an OMC one?
    Make a mold and make one from pre preg carbon?

  7. #167
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    What are you trying do or achive by adding a light flywheel.Bet if ya put one on and did a blind test ya coulnd`nt even tell the differince.depends on the rig?

  8. #168
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    bet i could..

    harder to start and bad idle

    No your right not much gain except maybe on a drag boat.
    But it will soften the load on the crank and top bearing when the engine moves around
    If you have ever watched an inline merc running with the top cowl off you will be amazed at how far the gyroscope effect moves the ring gear even in calm water.
    Of course we all know Evi's are tougher than Merc's
    Last edited by Powerabout; 09-22-2009 at 04:13 AM. Reason: added data

  9. #169
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    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052

  10. #170
    Team Member sheuninck's Avatar
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    Default here is a pic of the pancake flywheel on ebay


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