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Broken piston rings

Subject: Broken piston rings
by a12dato120y on 2019/12/14 11:08:03

Have a slightly worked a12 with a cam and h89 head and this is the second time i have broken the top compression rings.

The first time i suspect due to running to much timing. But when replaced the rings i put the timing back to factory 8 degrees and i just took the engine apart to put in some flat top pistons and all rings where good except cylinder 4 top ring was broken again.

Is this caused by detonation? Engine revs to 7500-8000rpm every know and then do i have to run less total timing then factory for these rpms?

Realy want to figure this out before putting the flat tops in and upping compression.