#5 piston damage...what happened.. Pics inside
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#5 piston damage...what happened.. Pics inside
This is out of a guys 01 M6 WS6 with 68K on it. He has owned the car under a year so we don't know all the history on it but it came with just headers, catback exhaust and a 4.10 gear . He started getting #5 missfires last summer and it continued to get worse over a short amount of time with shooting the blues and such. Finally got it tore down this spring.
Shot some pics of the#5 pistion....what could of caused this damage? All the other pistions look like normal wear...
Couple more shots....
http://i27.photobucket.com/albums/c1...b/IMG_0935.jpg
http://i27.photobucket.com/albums/c1...b/IMG_0936.jpg
http://i27.photobucket.com/albums/c1...b/IMG_0934.jpg
Shot some pics of the#5 pistion....what could of caused this damage? All the other pistions look like normal wear...
Couple more shots....
http://i27.photobucket.com/albums/c1...b/IMG_0935.jpg
http://i27.photobucket.com/albums/c1...b/IMG_0936.jpg
http://i27.photobucket.com/albums/c1...b/IMG_0934.jpg
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perhaps the previous owner was running a 100 shot? ?
I think there would have been more damage to the top of the pistion due to detonation on the bottle and it would of took out a few more in the same area....
#7
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Originally Posted by black01_WS6
could be from nitrous, but it usually takes out #7 not #5. how did the rest of them look like?
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Yeppers...perfect example of what detonation can do, especially when on the bottle. It does/can happen N/A also, but much more often on the bottle. Many people do not keep close tabs on A/F when they spray, or even bother to tune properly....
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My '91 had two pistons that looked very similar after I overrevved it on a 150 shot...
the car was driveable but had serious blowby
Im guessing the missing chunks of metal were being held to the piston by the rings? if this were the case, there would be no scoring of the cylinder walls.
good luck, Nick
the car was driveable but had serious blowby
Im guessing the missing chunks of metal were being held to the piston by the rings? if this were the case, there would be no scoring of the cylinder walls.
good luck, Nick
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Originally Posted by VORTECFCAR
My '91 had two pistons that looked very similar after I overrevved it on a 150 shot...
the car was driveable but had serious blowby
Im guessing the missing chunks of metal were being held to the piston by the rings? if this were the case, there would be no scoring of the cylinder walls.
good luck, Nick
the car was driveable but had serious blowby
Im guessing the missing chunks of metal were being held to the piston by the rings? if this were the case, there would be no scoring of the cylinder walls.
good luck, Nick
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what did the plug look like? was the porcelain peppered with piston pieces? i cant see the picture here at work(****** firewall), but it sounds like you guys are talking about broken ring lands or a holed piston. if the nitrous didn't do it, i'd look at the injector for that cylinder.
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I worked on this car and did a leakdown test for compression. The guy bought it like this and had no idea there was anything wrong with the engine. It idled a little rough, but once you got the rpm's up, you didn't notice too much difference. Also,the check engine light didn't come on for miles of driving so the guy that sold it cleared the codes and sent it on it's way! There are some true shady people out there that pray on others that have no clue about whats going on. When I pulled the plug to do the compression check it was looking like new. I smelled a rat instantly! Oh well......live and learn the expensive way?! I'm almost sure nitrous was used on this car.Lots of switches and wire going nowhere hanging under the dash and in the console. Traver