Piston to wall clearance?
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Piston to wall clearance?

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    Senior Member repoman's Avatar
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    Default Piston to wall clearance?

    what is the optimal piston to wall clearance on a blown 496 in a v drive?

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    Senior Member EVILFORCE's Avatar
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    Depends on the pistons you use to start with.
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    Senior Member repoman's Avatar
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    I'm using srp forged pistons . the paper that comes with them is confusing. blown applications may require .001-.003 to be added cold water pickup marine applications may require an additional .002-.004. the minimum for a big block is stated as .003-.0035 . . thank in advance for any ideas.

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    steelcomp was here
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    Quote Originally Posted by repoman View Post
    I'm using srp forged pistons . the paper that comes with them is confusing. blown applications may require .001-.003 to be added cold water pickup marine applications may require an additional .002-.004. the minimum for a big block is stated as .003-.0035 . . thank in advance for any ideas.
    I'd run no less than .006 to start. Some guys like 'em loose and will run as much as .008, some even .010. While the engine may like to run loose, it doesn't leave much room for a clean up hone should you ever need one.
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    gn7
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    With SPS's, I have the clearences set at .008 with an uncoated piston, then I send the pistons out to be coated. It closes up the clearences a little, but the coating will wear to what the piston wants. I would say between .006 and .008 depending on how hard you plan on running it. River racer maybe .006. Offshore maybe .008



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    Senior Member EVILFORCE's Avatar
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    When I build a motor I tend to set them up to the minium. Just take your time breaking them in. Get a lot of starts and up to temp then let it cool. The pistons will size to the cylinder after awhile. Seems like they work better and last longer that way for me.
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    Senior Member Morg's Avatar
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    I would also pay attention to what the manufacturer has to say. They should know the alloy & how much it will expand with heat.
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    Senior Member Jim W's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    When I build a motor I tend to set them up to the minium. Just take your time breaking them in.
    You mean.....scuffing them in?????

    That isn't going to work.

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    gn7
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    Quote Originally Posted by EVILFORCE View Post
    When I build a motor I tend to set them up to the minium. Just take your time breaking them in. Get a lot of starts and up to temp then let it cool. The pistons will size to the cylinder after awhile. Seems like they work better and last longer that way for me.
    I perfer not to have my pistons wear. I have some with quite a few hours on them and the coating is still there as, is the skirt machining. How do you know when they a "worn in" enough to real go out and beat on it. When the alumn stop showing up in the oil?



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    Last edited by gn7; 01-07-2010 at 04:20 PM.

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    Quote Originally Posted by gn7 View Post
    I perfer not to have my pistons wear. I have some with quite a few hours on them and the coating is still there as, is the skirt machining. How do you know when they a "worn in" enough to real go out and beat on it. When the alumn stop showing up in the oil?
    Ouch!
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