Diamond Piston ?

[billy408stroker]

What would cause this on these diamond pistons...My friend has only ran these a few weeks and he changed heads and saw this..What would cause this ? 3 or 4 pistons have this in the same area only...

 

[HotFox]

detonation...
Ive seen some out of a tractor engine that looks like some one sand blasted the whole piston from running too lean.

Scott

 

[billy408stroker]

I wanted to beleive the same thing also....I found out just a few mins ago, he ran some 4 year old vp114 been sitting on concrete....Since the car was never raced and only ran while at idle , it just about has to be bad fuel...He gassed it a few times but never raced it nor ever left his shop...13:5.1 compression...

 

[Rick 91GT]

Correct that is from detonation...I'd just knock any rough edges off those dimples of any

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