Fireball

iTrader: (21)

Upon disassembly of my motor, I found a cracked ringland on #7

it was cracked in 2 places between the 1st and 2nd rings without any visible damage to the crown. Also found a small crack under the 2nd ring. No other pistons showed any damage.

Can detonation crack between ringlands and NOT damage the piston crown? Definately had severe blowby in #7

RGR Pete

Did the detonation close the top ringland? Stock pistons?

Fireball

iTrader: (21)

yes stock pistons but 100% N/A

the area above the 1st ring shows no damage. both cracks were between the rings and a small crack under the 2nd ring

dug

iTrader: (10)

Always #7

Fireball

iTrader: (21)

I know what caused it

93 octane and -2000' DA with over 11.5:1 compression don't work out so hot

I just find it fascinating that the crown of the piston above the 1st ring didn't get hurt

dug

iTrader: (10)

Maybe the detonation hurt the bearings too.

Wet 1

iTrader: (4)

I think several of the theories are interesting, but I'd love to positively know why it always seems to be #7.

Brains

iTrader: (7)

I've seen it on an LT1 before.. It was wild, the ring land darned near became another ring itself

Fireball

iTrader: (21)

quite possible. Not sure when they turned...but they don't look *that* bad, so I'm assuming it was relatively recent. Crank looked ok but I'm putting in a new crank as a precaution. Mains all looked great.

*disregard the last edited thing in your post...I accidently hit edit instead of quote *

Fireball

iTrader: (21)

here is that bastard

Turbo LS1 SS

iTrader: (7)

i had a 7 go ;(