hyper piston ring gap

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hyper piston ring gap

Post  GT300TD on May 8th 2013, 4:52 pm



I was reading a thread on ring gap for hypereutectic pistons and can't find it now. Can't remember if it was on this forum or the 'other' BBF forum. Bought a 468 to refresh w/KB 137 pistons and want to make sure of the ring gap. I believe .030 gap for the top ring was what was decided on. Pistons are flattop w/ one valve relief, .032 on hole and D3 heads.
Thanks Smile






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Re: hyper piston ring gap

Post  69F100 on May 8th 2013, 5:29 pm

On KB piston check with them I know when i was cutting my rings for my KB forged paper work from kb called for .004 than my rings called for.
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Re: hyper piston ring gap

Post  kim on May 8th 2013, 7:51 pm

Definatly check with KB, hypers, because the piston absorbs less heat something with the amount of silica in the material, push more heat into the ring. This coupled with a very "brittle" material means hypers require more ring gap in comparable bores than high performance forged, and way more than comparable builds with standard stock pieces.

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Re: hyper piston ring gap

Post  rmcomprandy on May 8th 2013, 8:05 pm

.0065"/.0070" per inch of bore size if running NA.

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Re: hyper piston ring gap

Post  GT300TD on May 8th 2013, 8:37 pm


Thanks Smile


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