Good for you! And Him! I'm glad to see someone respects their parent.
However, I was driving the car and there was no sound of knock detonation or even pinging...AT ALL! I ran 93 octane fuel too.
Compare buckshots pistons that show detonation to mine and you'll see there is no comparison. Examine the cracked material in detail and you will see that there is an unnatural surface to a large part of it, it was not solid there. There are some small areas where there is a sharper brittle looking crack, but the rest of the area is not. This leads me to think that the casting did not cool and solidify uniformly in that area and when the ring grooves were cut it exposed a weak point. The weak point was strong enough for normal duty but not intake pressures of 7psi at 160+ degrees F.
Demon:
Forged pistons are nice, but after the above conditions and only one piston broke in a way that convinces me it wasn't detonation related but rather defective part related...I'm thinking that another stock piston that is carefully examined for defects is probably what I'll do.
And the INTERCOOLER! That will solve my problems.
warmonger
