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  1. #1
    ricky86's Avatar
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    riva piston ring end gap

    i'm rebuilding my motor with riva pistons (stock size) and i was wondering what ring end gap i
    should use. when in calculate it with the instructions that came with the pistons i have to use
    0.031 inch. is this correct for running with a ET 68-140.

    also what gap should i use on the oil rings??? because i hear different things about that,
    the one says use 0.015 inch and others say to use the same gap as the compression rings.

    thanks


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  3. #3
    ricky86's Avatar
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    thanks for the reply, i got the instructions. just want to know if the calculation i made is the correct one.

  4. #4
    Bob 1tommygunner1927's Avatar
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    According to Riva's instructions, .031" is the correct gap for the top ring (3.937 x .0080 = .031496").

    The rest of the instructions are not clear for the second ring and third. Call for e-mail Riva: (954) 247-0705




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  5. #5
    ricky86's Avatar
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    this is the reaction i got from riva tech support.
    The top ring should be adjusted to the proper end gap.
    The second ring should be .004-.008 inches more than the top ring.
    The oil ring should not be filed. It should have at least .015 inch gap

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