melted pistons
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melted pistons
we were street tuning the car with the tuner on the highway the car was driving fine my wideband was showing that i had enough fuel it was at 11 at wide open throttle i'm trying to find out what caused this i cheched the injectors and they all work.
#6
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Re: melted pistons
All on the intake side.... look like pre-ignition as well.
New pistons, new tuner and try it again. Obviously the tuner has no idea what their doing.
New pistons, new tuner and try it again. Obviously the tuner has no idea what their doing.
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Re: melted pistons
well what i'm thinking is that the tuner mess up i just had replace the head gasket a 1 month ago when he was tuning the car he made it detonate and it cracked the head gasket around the fire ring and also on top of the pistons was pitted on the intake side of the valve.
Last edited by jprelude92; 02-24-2010 at 04:16 PM. Reason: miss spell
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Re: melted pistons
pre ignition is a case where something physical (i.e. hot spot carbon) causes the a/f mix to light before it is supposed to.
detonation is caused by lack of octane, overly advanced ign timing, or too much boost causing the a/f mix to destabilizt and light on its own.
with that, detonation is caused by, lean mix, over boost, lack of octane, too much timing, or any combination of the 4.
detonation is caused by lack of octane, overly advanced ign timing, or too much boost causing the a/f mix to destabilizt and light on its own.
with that, detonation is caused by, lean mix, over boost, lack of octane, too much timing, or any combination of the 4.
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Re: melted pistons
"Preignition" is caused by carbon build up, too hot of a spark plug, sharp edges on the piston, etc. That's not what did it here though.
I hate that term, because it does not specify if the "pre" is from an early ignition spark, or a hot spot. lol. But either way, obviously, pre ignition will cause detonation under high load conditions, since if it lights the mixture too early, that's the same exact thing as having too much timing advance.
Looks like all that happened here was that, too much timing advance, just like everyone said. Although I remember a thread a few years ago about where quite a few people had this happening with cp pistons on supposedly good tunes..
I'd smack the tuner upside the head with the laptop.
I hate that term, because it does not specify if the "pre" is from an early ignition spark, or a hot spot. lol. But either way, obviously, pre ignition will cause detonation under high load conditions, since if it lights the mixture too early, that's the same exact thing as having too much timing advance.
Looks like all that happened here was that, too much timing advance, just like everyone said. Although I remember a thread a few years ago about where quite a few people had this happening with cp pistons on supposedly good tunes..
I'd smack the tuner upside the head with the laptop.
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Re: melted pistons
thats detonation from to much ignition timing on a lower grade fuel. if it was 91-93 octane its easy to detonate without the porper tuning knowledge. a little to much timing for a long period of time aka a few back to back pulls will result in what you see in the pics.
new pistons, a real tuner and geturdone right
new pistons, a real tuner and geturdone right
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Re: melted pistons
they are definatly not the same thing and they happen for different reasons completely as well as at different times during the engine cycle.. most peoples idea of what detonation and pre ignition are is incorrect and or incomplete.
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Re: melted pistons
wow that is messed up!! i cracked a sleeve on my oem bottom on 10psi...but my pistons were mint no sign of detonation like that..those are melted and they are forged..you tuner should not be touching timing on a street tune..you can't measure the power difference while street tuning..he should have left timing slightly retarded and gotten your fuel right and then taken you to the dyno and play with the timing..
Last edited by cibao2ner; 02-24-2010 at 07:25 PM. Reason: text