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Discussion Starter #1
I have a question for everyone. I am in the process of rebuilding a 1991 Stealth TT. I pulled the heads and saw that the 6th cylinder had a broken/melted piston. I am pretty sure it was caused by predetonation. So my question is- what exactly causes predetonation? I am currently rebuilding the engine so id like to know how to avoid something like this happening again- can anyone help me?
-Shaun
 

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Too much boost
Too much timing
Inadequate cooling (both engine coolant and intercooling)
Too little fuel
Spark plugs with heat range that's too "hot"
Sub standard fuel quality
Oil in the intake charge
 

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All of the above are excellent ways to kill an engine. I use alcohol i jection to stop detonation. But if thats not your thing. Get a knock sensor. Run really good gas. Make sure your car stays richer then 12.7. Decrease boost on hot days.

WD
 

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Discussion Starter #4
Hey thanks guys. I know that the rear tubro had gone out not even a month before the piston did. I am betting that is what caused the piston to break. Sound like a possibility? Anyways, thanks for the help guys-
-Shaun
 
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