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95 imp · 08-04-2019, 04:41 PM

Back to OP- reading up on this, it is NOT a ring gap issue as some suspect.

According to TRW (and parent co.), The piston failed because of one (or more) of these causes:

Low Octane

Excessively High Compression Ratio
(Superchargers increase dynamic CR)*

Ignition Timing Too Advanced

A/F Mixture Too Lean

IAT Too High

This type of failure isn't caused by rings. One, more, or all, could occur while tuning a newly modded engine. Especially if IAT creeps up over multiple runs, or the car has low octane gas.

And, IMO, 91/93 is low for a static 11.5/1. Who knows what the dynamic CR is because of boost levels.

Section 3.4.5 has the dirt

https://www.memoparts.com/img/cms/Do...n%20Failue.pdf

*This part isn't stated in the PDF, but is common knowledge

08-04-2019, 04:41 PM	#95
95 imp Dumb Ass Deluxe Drives: A Tricked Out Mountain Bike Join Date: Jun 2019 Location: Arizona Posts: 1,963	Back to OP- reading up on this, it is NOT a ring gap issue as some suspect. According to TRW (and parent co.), The piston failed because of one (or more) of these causes: Low Octane Excessively High Compression Ratio (Superchargers increase dynamic CR)* Ignition Timing Too Advanced A/F Mixture Too Lean IAT Too High This type of failure isn't caused by rings. One, more, or all, could occur while tuning a newly modded engine. Especially if IAT creeps up over multiple runs, or the car has low octane gas. And, IMO, 91/93 is low for a static 11.5/1. Who knows what the dynamic CR is because of boost levels. Section 3.4.5 has the dirt https://www.memoparts.com/img/cms/Do...n%20Failue.pdf *This part isn't stated in the PDF, but is common knowledge