Denali08

What do you think is the cause of this piston damage?.

Diamond 2618 forged pistons. NA application. Tuned with 12.8 AFR.

Note; Only pistons # 5 and 7 got damaged. Others were fine. Spark plugs tips were broken and melted.








Spark plugs. All three are on driver side.

hirdlej

iTrader: (31)

Show us the heads

kbracing96

iTrader: (26)

EXTREME detonation! That thing would have had to been rattling HARD to break forged piston like that. Basically too much timing and not enough fuel.

kbracing96

iTrader: (26)

I just noticed something... Both pistons broke where the top rings come together. This really makes me think that the ring gaps may have been set too tight and then they expanded and butted together, got tight and contributed to breaking the ring lands.

BlownChevy

iTrader: (20)

or a combination of both.........

KySilverado

iTrader: (7)

Is it me or is there a butt load to much piston to cylinder wall clearance there?

I agree... severe detonation. You can see where it etched the ring land that is still there. Piston let go then took out the spark plugs.

SILVERADO11

X3 severe detonation! maybe she went lean and had to much timing.

BlownChevy

iTrader: (20)

WOW

Foxxer

Who was your tuner :O !

Damn, so that's how detonation failure looks like, poor 55's.

Denali08

Correction: Diamond 2618 forged pistons.