FML... I'm done for now with sr's and maybe 240's

[S14DB]

Originally Posted by racepar1

A lean mixture can cause detonation or "pinging" just the same as timing can. Ever gotten some bad gas? It pings like shit... A lean mixture is almost certainly what happened to the first piston pictured. Timing can't do that. Lean = heat, heat = melted shit. I also seriously doubt that it was timing that caused his latest failure as well. I suspect either an oiling issue or incorrect clearences related to that piston caused it. The way the piston came apart it looks like it seized in the bore and the rod smashed it's way through it.

Lean mixture melting shit is different then detonation.

Bad gas you describe is low octane or resistance to detonation. Not the air:fuel ratio. Bad gas doesn't change the A:F ratio.

I am not saying his damage was caused by detonation or running lean or both. I am saying that his statement that you can't detonate while running rich is false.