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Old 02-06-2006, 04:15 AM   #21
03sonicgt
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Default RE: Burnt piston in engine

Damn your lucky, my parents are lame and whine when I order things with their credit card even though I give them the cash the next day. Haha whatever. I kinda want the n/a route with nitrous for now.
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Old 02-06-2006, 11:59 AM   #22
cobra04
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Default RE: Burnt piston in engine


Quote:
ORIGINAL: Jglisson

Well...

Some of you do not know...but I blew my engine in my 99 GT about a month ago. I just now tore down my factory engine. Piston #7 has a nice chunk missing out of it. About half the cylinders were full of coolant when I pulled the heads. I still haven't determined what caused the piston to burn. The burn is underneath the intake valve which is strange as well. I wasn't spraying at the time the engine popped and what few times I have sprayed I was only running a 100shot with 93 octane.

Any ideas?

I will be getting rid of some good parts soon...If you name it, I have probably got it.

Good PI heads, sensors, etc.

i would have to say that your tuning was off....and maybe on a previous day when you where spraying you backfired and thats why your intake valve is burned and the piston mighteve gotten fatigued and when you punched it the last time....it just gave out at the stress point.
please go forged be4 you spray...and make sure the car's timing is right when the nos is going.or you'll be having piston pieces for breakfast again and again.
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Old 02-06-2006, 12:09 PM   #23
angcobra
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Default RE: Burnt piston in engine

Sounds like classic detonation. (If it looks like the top ring knocked the top edge of teh piston off right under the intake valve.) Forged bottom end will not protect you from detonation.
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Old 02-06-2006, 12:44 PM   #24
SOHCtimes2
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Default RE: Burnt piston in engine

Quote:
ORIGINAL: angcobra

Sounds like classic detonation. (If it looks like the top ring knocked the top edge of teh piston off right under the intake valve.) Forged bottom end will not protect you from detonation.
No, it sure wont....but TUNING will. So many people can't quite grasp the fact that cars need propper tuning....oh well.
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Old 02-06-2006, 01:10 PM   #25
Dsmfighter
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Default RE: Burnt piston in engine

+1. I dont know how many miles or how big of a spray he's running though.

Quote:
ORIGINAL: SOHCtimes2

Quote:
ORIGINAL: angcobra

Sounds like classic detonation. (If it looks like the top ring knocked the top edge of teh piston off right under the intake valve.) Forged bottom end will not protect you from detonation.
No, it sure wont....but TUNING will. So many people can't quite grasp the fact that cars need propper tuning....oh well.
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Old 02-06-2006, 01:10 PM
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