Quote:
Originally Posted by 94cobra69ss396
I broke two pistons, twice, in the Cobra when I first built it with the supercharger. That was with a safe tune and only 15* of timing. Hypereutectic pistons don't handle detonation well. I had less than 800 miles on the engine both times and for the first 500 I didn't even get on it. The car only detonated between shifts and that's when it broke both times. I now have forged pistons and over 70,000 miles on it since. I drive it all the time. In fact I put just under 800 miles on it yesterday driving back and forth to Fresno to a customers.
|
Yeah I wouldnt go hypereutectic on a built motor, they contain way too much silicone. I have 25*+ of timing and run an e85 mix and rarely see any knock retard...maybe on a hot day after being in traffic and even then not really. Its all in the tune as well. I have like 7-10,000mi on mine but no problems yet....I hope it stays like that.