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Thread: reeds and blocks

  1. #11
    FFX-61
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    um, it's about used parts in the used parts pile, with dirt on them, just shots of the styles mention above.........

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

  2. #12
    FFX-61
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    so i'll relight this off...

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

  3. #13
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    great stuff
    have you got your CFD package running?

  4. #14
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    no, no CFD, just old school, what worked, what didn't , i'm movein right now, so may be slow gettin this up, but it brakes it up for me

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

  5. #15
    FFX-61
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    so, the coated block seal up nicer, but ether works. the block, the max amount of air and fuel is determined by the size of the blocks windows. the biger they are the more air fuel gets by.

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

  6. #16
    pdt
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    would it also help with top end if the reed housings were highly polished to aid the flow of air ?
    and also chamfering the edges to get that little bit extra from them again top end.

    looking at the 2 stage reeds, are these infact single reeds with the tops thinner ? or two separate leafs ?

  7. #17
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    linein up the blocks on the intake with a fresh gasket is time well spent, as well for the carbs to the intake with a fresh set of gaskets.
    you can remove the ribs of the block, use a full peddle reed on the second stage, this increases the volume, have had problems with cold sneeze, to get around the cold sneeze used a squeez bottle to choke her as she comes up to temp. omc squirt gun style choke or sled hand pump choke works.

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

  8. #18
    Sam Cullis Mark75H's Avatar
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    Quote Originally Posted by pdt View Post
    would it also help with top end if the reed housings were highly polished to aid the flow of air ?
    and also chamfering the edges to get that little bit extra from them again top end.
    Only if the reeds & cages were the limiting factor to begin with. If something else, like porting or carb is the real limit, all the polishing in the world won't make a bit of difference
    Since 1925, about 150 different racing outboards have been made.


  9. #19
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    polishing it's self, i've found that it's more about makin it flow smooth as in gasket matching, a seamless match of the cases, high spots, alinement corrections, ect..., a buff shine looks nice............ but smooth works about the same, less work.

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

  10. #20
    pdt
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    that makes good sense, and less work sounds real good.
    i have a spare reed housing and looking at it, its realy not that pretty at all.
    I shall just smooth it now, instead of polishing to a lustre ha ha

    thanks on the tip.
    .

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