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Thread: squishing block

  1. #1
    Team Member genea01's Avatar
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    Default squishing block

    i was told years back about squishing the block on a motor and just wondering is this a true statement and is there any big gain in this

  2. #2
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    A pretty common practice on the mercury blind bore motors, big gain is another story, rather part of a combination of mods, port timing, open exhaust etc. If done poorly you've ruined your block as was demonstrated a few years ago by a very opinionated contributor to this site.

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    Sam Cullis Mark75H's Avatar
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    Even at that, I don't know if it has any use outside of "blue printing" a stock motor to allowable specifications in a "stock" racing class where no modifications are allowed.

    There would definitely not be a BIG gain
    Since 1925, about 150 different racing outboards have been made.


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    2010 SRG 3 CYL CHAMPION 88workcar's Avatar
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    The rules are "RUN WHATCHA BRUNG"
    Helping folks out around the globe.

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    When you say squish the block do you mean, squish the cylinder head to increase compression, or squish the crankcase to increase crankcase compression?

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    Sam Cullis Mark75H's Avatar
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    The head
    Since 1925, about 150 different racing outboards have been made.


  7. #7
    Dago fast
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    Default Port timing

    How does it increase power? Top end or hole shot? How is it acomplished?

  8. #8
    Sam Cullis Mark75H's Avatar
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    I would recommend a different thread to ask and answer the port timing question.
    Since 1925, about 150 different racing outboards have been made.


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    2010 SRG 3 CYL CHAMPION 88workcar's Avatar
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    He is refering to the BLOCK, not the head. That is a totaly differant thing.
    Helping folks out around the globe.

  10. #10
    FFX-61
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    16cc's gots to be head chamber size. addin epoxys, ect to boost charging of the case, well i've seen it, millin on the case matin surfaces, seen that too,
    was told it's old school and for the most part no gain.

    more head comp' makes more power to a point, it too is old school, old school that works.

    port timin works kinda like a high performance cam, opens the ports sooner, keeps them open longer, in hopes to transfer more volume to make more power and or to move the power curve.

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

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