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Old September 27th, 2008, 07:13 PM
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Question Piston Damage, What caused this?

I tore apart a 1988 3800 and found this on #3.
What could of caused it?
Attached Images
  
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87 TR

MAFT Pro, LC1, PL, Tpro, Extender Pro, 30 over 109 block, stock crank, rods, and cam, Sealed Power forged pistons, stock irons w/larger valves, stock intake and tb, RJC plate, 60's, GT 6152 E, PTE FMIC, Razor Alky, stock headers, 3" ATR dp, 3" single-shot, 3200 Precision multi disc lockup, Deep trans pan w/ rear pickup.....
Diapers and politicians need to be changed regularly....and for the same reason!
Transmission DOA. Anyone want to help a fellow TR aficionado who is down on his luck?
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Old September 27th, 2008, 09:04 PM
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Aint no telling?
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Old September 27th, 2008, 09:12 PM
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I've seen SC pistons chunk the edge of the piston off from detonation. Yous looks like it wore off rather than breaking off. The edges look smooth where the piston is missing. Or at least it appears that way. I wouldn't think and NA would detonate enough to chunk a piston. I guess pull it out and get a closer look.
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Old September 27th, 2008, 09:31 PM
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Is that a big dent in #1, or a reflection?
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Old September 27th, 2008, 09:36 PM
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Looks like detonation to me!
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Old September 28th, 2008, 02:33 PM
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Looks like a lean condition followed by detonation. My first guess would be a clogged injector, but there are many other possibilities.
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Old September 28th, 2008, 04:37 PM
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Lookin at the difference in piston color and the head gasket between the front 2 cylinders im leaning on detonation man!
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New forged 428" LSX/4L80 in the works for some-tim'ish in late 09 Bowtie LSX block - World Warhawk 6 bolt heads - Callies Dragonslayer crank cryo'd and nitrided - Oliver rods - Diamond Pistions - 4L80E built with a PTC 3500 10" stall - Bowtie Single Plane EFI intake - Fast XFI - Dual nozzle methanol - Precision PT101 - RJC Megacooler - Aeromotive pump with - drop sump fuel cell - and alotta time and money

1986 Grand National - Turbo LSX conversion and all the goodies to make it work.......

Visit my Myspace page, always looking for Turbo Buick friends...

www.myspace.com/rysfly

30 pounds of boost is like a smokin hot chick with an STD, you really wanna hit it but are afraid of the concequence.......
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Old September 29th, 2008, 07:34 AM
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While diagnosing a very rough idle I found this:
Code 43-knock sensor bad
Fuel injectors were were badly clogged with rusty bits from a fuel filter that had come apart, especially number 3.

I was leaning toward detonation damage myself.
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87 TR

MAFT Pro, LC1, PL, Tpro, Extender Pro, 30 over 109 block, stock crank, rods, and cam, Sealed Power forged pistons, stock irons w/larger valves, stock intake and tb, RJC plate, 60's, GT 6152 E, PTE FMIC, Razor Alky, stock headers, 3" ATR dp, 3" single-shot, 3200 Precision multi disc lockup, Deep trans pan w/ rear pickup.....
Diapers and politicians need to be changed regularly....and for the same reason!
Transmission DOA. Anyone want to help a fellow TR aficionado who is down on his luck?
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