Piston Clearance?
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Piston Clearance?

  1. #1
    Member paradigm shift's Avatar
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    Default Piston Clearance?

    I searched first and it seems many run .0015 to .002 extra clearance for marine use. I need to have a block bored and the old set up had some slight scuff but I think it was from detonation issues I had more than clearance. Running JE 131670 piston so is .006 to .0065 clearance enough or do I need to open it up? Tall deck with 4.5 stroke. Light boost compared to some should be around 7 - 9 lbs. 29' deep vee boat not a river rocket if that makes a difference. 5600 - 6000 rpm tops as long as the rev limiter works.

    Thanks

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  3. #2

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    Post piston clearance

    I would open it up some. Call your piston manufacture and see what they recommend for supercharged marine engines.

  4. #3
    Member paradigm shift's Avatar
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    Quote Originally Posted by Boost Daddy View Post
    I would open it up some. Call your piston manufacture and see what they recommend for supercharged marine engines.
    Thanks BD. I have not called JE but here is what there spec sheet calls for.
    ***Clearances listed below are minimum. Some applications such as supercharged, turbo, nitrous and endurance applications may require
    additional clearance (.001-. 003"). Coldwater pickup marine applications may require an additional .002-.004".

    Piston sheet calls for .0045 plus what is listed above. Could be from .001 - .007 depending on how you read it. I am hoping for some real expierance feed back from those that run JE pistons in a lake blower motor on gas. I know every motor is different.

    Thanks Andy

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    The clearence was .007 on my engine. I used CP Pistons.

  7. #5
    Member paradigm shift's Avatar
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    Quote Originally Posted by Boost Daddy View Post
    The clearence was .007 on my engine. I used CP Pistons.
    Thanks BD are the CP pistons the same material as JE (4032)?

  8. #6

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    Quote Originally Posted by paradigm shift View Post
    Thanks BD are the CP pistons the same material as JE (4032)?
    I'm sorry to say I don't know if they are the same.

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