Atomic

iTrader: (37)

410 iron block, forged rotating assembly, 9.5 compression, 500 miles
pt88 ~14lbs of boost
~12 degrees timing



Never detected knock or heard detonation, AFR was 11.5. Fuel system was within capacity (IDC <90%). Heat range 7 NGK plugs.

thoughts? theories?

O2Form

DENTONATION, find a new tuner. Look at the other piston, its about to toss its cookies too. Those pistons are WAY overheated. I'll guess someone tuned the knock sensors out.

Greekey

iTrader: (3)

Detonation is my guess

Quickfrc

iTrader: (10)

what does the plug look like? That should help some.

brian_rs/ss

more pics please.

you can definitely tell by the color of the pistons that they were over worked. what type of coolant system are you running? FMIC? what were intake temps like under WOT?

King Nothing

iTrader: (9)

should the coolant be dexacool????? anyway can a faulty knock sensor cause this? reason i ask is cause my rear knock sensor is sending a code and i'm wondering if i can go a few weeks without replacing it or if i should replace it ASAP i only live a mile from work so i can walk if necessary

O2Form

That damaged happened at WOT, don;'t drive WOT to work and you'll be fine.

Jon@Texas-Speed

iTrader: (18)

Looks like detonation. Did it melt the top ring land or did it break it off? Hard to tell from the pic.

Jon

Atomic

iTrader: (37)

Pretty sure it melted the ring land, although there are chips on the piston and cylinder head from what looks like fragments flying around.

I will know more when I pull the engine this weekend and can get a good look at it. Cooling system is basically stock with a 34" rad. Intake temps got up to around 170 but its pulling timing down to 3 or 4 degrees at that point.

Do you think that injector could be clogged?

King Nothing

iTrader: (9)

awesome thank you

O2Form

Looks to me like the tune was too close to the edge, I'll bet ALL the pistons are damaged and 7 and 8 always do run leaner than the rest.