Burnt piston ----- pic inside !!!!!!!!!!
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From: St. Charles, MO
Burnt piston ----- pic inside !!!!!!!!!! Any ideas on what would cause this? Looks like the cylinder went lean. Car was on the dyno the day before and the air / fuel was fine. Was running 100 octane fuel and was N/A when this happened.
<img src="http://www.msnusers.com/_Secure/0RQAPIQEThH!n8xR3XlUWcsWeFN!JtiMq2qGNjHukAsH1kxGs4 fj3Zn1yAb2Blru!ZCnhVF8wyOewV*66rM26rAzxpxchx*W26wc Nsbxukls/engine-006.jpg?dc=4675418669381899297" alt=" - " />
<img src="http://www.msnusers.com/_Secure/0RQAPIQEThH!n8xR3XlUWcsWeFN!JtiMq2qGNjHukAsH1kxGs4 fj3Zn1yAb2Blru!ZCnhVF8wyOewV*66rM26rAzxpxchx*W26wc Nsbxukls/engine-006.jpg?dc=4675418669381899297" alt=" - " />
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From: New Jersey
Re: Burnt piston ----- pic inside !!!!!!!!!! That #7 definatly had detonation and or breached the head gasket and leaked coolant into that cyl under high temps. I would have #7 injector tested for flow and or replace to be on the safe side. Seems like you floated the valves at one point too? just confirm your P-V clearance upon re-instalaion to make sure you have enough room. Check that cyl wall closely on that burnt piston hole to make sure you didn't crack the liner too.
Joe.
<small>[ April 21, 2003, 05:19 AM: Message edited by: JPR ]</small>
Joe.
<small>[ April 21, 2003, 05:19 AM: Message edited by: JPR ]</small>
TECH Veteran
Joined: Aug 2002
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From: Hartsdale, NY
Re: Burnt piston ----- pic inside !!!!!!!!!! ...that makes me ill!!! ..can you sube the General?
Do you think this would have happened if our pistons were forged and not cast?
Lets write a letter to GM and ask that they make this change in the Gen six Vette... ..after all, they will be using the same low tech motor ...the least they could do is update the pistons for 1960's technology!
Do you think this would have happened if our pistons were forged and not cast?
Lets write a letter to GM and ask that they make this change in the Gen six Vette... ..after all, they will be using the same low tech motor ...the least they could do is update the pistons for 1960's technology!
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From: Lake Zurich, IL
Re: Burnt piston ----- pic inside !!!!!!!!!! Is that a gap at the top of the piston? Is a burnt piston denoted by the brownish color on top instead of carbon buildup?
My #3 looks kinda brown...
<img src="http://www.horist.com/images/headcam/IMG_2147_small.JPG" alt=" - " />
Is that burnt?
<small>[ April 21, 2003, 02:46 PM: Message edited by: horist ]</small>
My #3 looks kinda brown...
<img src="http://www.horist.com/images/headcam/IMG_2147_small.JPG" alt=" - " />
Is that burnt?
<small>[ April 21, 2003, 02:46 PM: Message edited by: horist ]</small>
Re: Burnt piston ----- pic inside !!!!!!!!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DOC OTIS:
<strong>
Had a problem with my throttle sticking (WOT) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What was causing the throttle to stick? That's one problem I would like to avoid!
<strong>
Had a problem with my throttle sticking (WOT) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What was causing the throttle to stick? That's one problem I would like to avoid!
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From: St. Charles, MO
Re: Burnt piston ----- pic inside !!!!!!!!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Cal:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DOC OTIS:
<strong>
Had a problem with my throttle sticking (WOT) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What was causing the throttle to stick? That's one problem I would like to avoid! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have TNT kit on the car and there is a set screw on top of the purple ring that mounts to the throttle body. For some reason the set screw vibrated out and caused the throttle to hang WOT. It took me awhile to figure this out so it happened 4 or 5 times. Easy fix I just put some loctite on the screw - no problem since.
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DOC OTIS:
<strong>
Had a problem with my throttle sticking (WOT) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What was causing the throttle to stick? That's one problem I would like to avoid! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have TNT kit on the car and there is a set screw on top of the purple ring that mounts to the throttle body. For some reason the set screw vibrated out and caused the throttle to hang WOT. It took me awhile to figure this out so it happened 4 or 5 times. Easy fix I just put some loctite on the screw - no problem since.
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Thread Starter
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From: St. Charles, MO
Re: Burnt piston ----- pic inside !!!!!!!!!! Thanks for the reply Joe. Building another motor and hope not to see a pic like this again. I looked at the head gasket real close and it looks perfect. Guess it could of been an injector but that is weird cause the car only has about 5000 miles on it. I am actually building a different motor for the car so I will be able to inspect the block closely for cracks in the cylinder.
Had a problem with my throttle sticking (WOT) thats is why the pistons are knicked I was pretty sure I would find that (hit the rev limiter [7000]4 or 5 times before I figured the problem out.
Had a problem with my throttle sticking (WOT) thats is why the pistons are knicked I was pretty sure I would find that (hit the rev limiter [7000]4 or 5 times before I figured the problem out.
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Joined: Apr 2003
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From: Nebraska
Re: Burnt piston ----- pic inside !!!!!!!!!! Well, after seeing that pic I wont be able to sleep without a nightlight.
Is your fuel system up to task? From the pic it looks like you had some serious detonation, and that melted gap is just ugly! Did you have your knock sensor tweaked too much?? Im kind of a noob with the LS1. But I have friends running lots of nitrous, and never have a problem like that. I agree the GM needs to get a clue and put forged pistons in everything V-8.
Is your fuel system up to task? From the pic it looks like you had some serious detonation, and that melted gap is just ugly! Did you have your knock sensor tweaked too much?? Im kind of a noob with the LS1. But I have friends running lots of nitrous, and never have a problem like that. I agree the GM needs to get a clue and put forged pistons in everything V-8.
Thread Starter
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From: St. Charles, MO
Re: Burnt piston ----- pic inside !!!!!!!!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by UWDLOSE:
<strong> Well, after seeing that pic I wont be able to sleep without a nightlight.
Is your fuel system up to task? From the pic it looks like you had some serious detonation, and that melted gap is just ugly! Did you have your knock sensor tweaked too much?? Im kind of a noob with the LS1. But I have friends running lots of nitrous, and never have a problem like that. I agree the GM needs to get a clue and put forged pistons in everything V-8. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I put a walbro 340 intank pump in and made one dyno pull with the 100 pills in. The air/fuel spiked to about 15 then flattened out. So it still is going a little lean but not bad. I drove the car at least 40 miles and made 4 N/A passes at the track when this happened. Either the piston was weak from an earlier lean condition or I have a new fuel problem (injector, pump, etc).
<strong> Well, after seeing that pic I wont be able to sleep without a nightlight.
Is your fuel system up to task? From the pic it looks like you had some serious detonation, and that melted gap is just ugly! Did you have your knock sensor tweaked too much?? Im kind of a noob with the LS1. But I have friends running lots of nitrous, and never have a problem like that. I agree the GM needs to get a clue and put forged pistons in everything V-8. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I put a walbro 340 intank pump in and made one dyno pull with the 100 pills in. The air/fuel spiked to about 15 then flattened out. So it still is going a little lean but not bad. I drove the car at least 40 miles and made 4 N/A passes at the track when this happened. Either the piston was weak from an earlier lean condition or I have a new fuel problem (injector, pump, etc).
