Ring gap requirements

Forced Induction Mopar

  1. 440magcars

    440magcars Active Member

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    The top of 3 of my pistons broke off above the top ring. Engine builder gaped the rings at .024 top ring and .015 2nd ring. seems a little tight for a forced Induction engine. Anyone know for sure what the ring gaps are supposed to be? Engine is a 508 stroker F2 Procharger.
     
  2. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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    What's the bore size?
     
  3. 440magcars

    440magcars Active Member

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    Bore is 4.36
     
  4. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    4.36"x.006"=.02616" top ring and put second ring at .028" even a little more on both won't hurt. if block hard filled x .00675"

    my bore is 4.040" and gapped rings at .027" top and .029" second ring. my block is 2/3 filled
     
  5. RustyRatRod

    RustyRatRod Weenie idiot loser. FABO Gold Member

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    Call your piston manufacturer if you want a real answer.
     
  6. 440magcars

    440magcars Active Member

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    Ok thanks guys!
     
  7. mcat

    mcat Well-Known Member

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    .028 top .030 2nd on my boosted 3.917 bore
    you were definitely too tight
     
  8. 70Duster440

    70Duster440 Well-Known Member

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    70wayfarer outlined the general rule of thumb. I used a factor of .0065. On a 4.35" bore I was at .028" and .030" respectively. I'm curious to know what your static compression ratio was and what kind of boost level.
     
  9. 440magcars

    440magcars Active Member

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    compression is 9.2 and around 10lbs boost at half throttle.
     
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