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  1. #1
    mrbtd's Avatar
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    Help with conservative squish

    I have read every post I could about squish....

    I realize 38 to 40 thou is ideal performance wise on pump gas (cylinder decking, angles etc.. all accounted for).

    If fuel quality is a concern does the tighter squish raise the chances for deto problems ? 75 % of the time I will be able to get 93 octane fuel. I will not run the free flow exhaust !

    With a tighter squish does water ingestion become more of an issue ? In other words are the chances of throwing a rod outside the cases higher ? There is no doubt it ill get some water @ some point in the summer.


  2. #2
    Moderator OsideBill's Avatar
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    What is your compression? This needs to be factored in also

  3. #3
    mrbtd's Avatar
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    Motor is not assembled but it looks like compression will be between 150 and 160 - With two layers of 1300 head gasket.

  4. #4
    Moderator OsideBill's Avatar
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    Compression is more of a factor for the deto concern, at 150-160 you might want to get some octane boost to carry for those times you can't get 93 oct.

    Water ingestion is a good question, but I think if it were .060 or .030 squish enough water ingested is going to get you either way. I have been running outer wears for the rough water riding.

  5. #5
    Happily Self-Employed WFO's Avatar
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    One of the biggest concerns with a tighter squish is piston touchdown on the cylinder head, whether from over reving the motor, or running in heavy chop and the intake grate is constantly in and out of the water.

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