#5 piston damage...what happened.. Pics inside

Reply Subscribe

Thread Tools

Search this Thread

Mar 26, 2006 | 06:12 PM

speedo

Thread Starter

10 Second Club

iTrader: (15)

Joined: May 2004

Posts: 652

Likes: 0

From: Minnesota

#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

Mar 26, 2006 | 06:14 PM

Grimes

TECH Addict

iTrader: (3)

Joined: Mar 2003

Posts: 2,636

Likes: 2

From: Northern NJ

perhaps the previous owner was running a 100 shot?

Mar 26, 2006 | 06:19 PM

black01_WS6

TECH Junkie

iTrader: (13)

Joined: Sep 2004

Posts: 3,857

Likes: 0

From: Fort Myers, FL.

could be from nitrous, but it usually takes out #7 not #5. how did the rest of them look like?

Mar 26, 2006 | 06:23 PM

speedo

Thread Starter

10 Second Club

iTrader: (15)

Joined: May 2004

Posts: 652

Likes: 0

From: Minnesota

Quote:

perhaps the previous owner was running a 100 shot? ?

Buddy thinks the same thing.....being on the bottle but everything else looks to clean. I forgot to add the cylinder looked really good also. Slight hone job is all it needed.

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....

Mar 26, 2006 | 06:54 PM

GuitsBoy

TECH Senior Member

iTrader: (4)

Joined: Apr 2003

Posts: 6,249

Likes: 3

From: Long Island, NY

Whats weird is that there dosnt seem to be much pitting on the top of the pistons from running lean, but im not sure how else he could have broken those ringlands. Id put money on it that the car was running some sort of power adder though.

Mar 26, 2006 | 07:23 PM

indyboom

Banned

iTrader: (11)

Joined: Mar 2006

Posts: 259

Likes: 0

From: YOUR MOMS

I third or fourth that.. Maybe they only rana few passes, That break sure is clean too..

Mar 26, 2006 | 10:20 PM

PREDATOR-Z

TECH Senior Member

Joined: Mar 2004

Posts: 14,620

Likes: 17

From: BFE

Quote:

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?

Looks like mine, and it took out both #7 and # 5 (nitrous)

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Pouria Savadkouei

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Verdad Gallardo

7 Most Reliable High-Performance Engines GM Has Ever Built

Verdad Gallardo

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Mar 26, 2006 | 10:53 PM

cantdrv65

TECH Junkie

iTrader: (3)

Joined: Nov 2001

Posts: 3,202

Likes: 0

From: TEXASS

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....

Mar 27, 2006 | 01:26 AM

#10

lowchevy2go

Launching!

iTrader: (4)

Joined: Mar 2005

Posts: 210

Likes: 0

From: memphis, tennessee

was your car knocking?? how did you know it did that ..waht were the signs

Mar 27, 2006 | 01:38 AM

#11

cantdrv65

TECH Junkie

iTrader: (3)

Joined: Nov 2001

Posts: 3,202

Likes: 0

From: TEXASS

It will miss like a bitch and have alot of blowby with just a cracked ringland. Eventually they end up like this and depending on where the pieces go the noise could get fairly loud.

Mar 27, 2006 | 03:53 AM

#12

eallanboggs

TECH Addict

iTrader: (1)

Joined: Mar 2002

Posts: 2,080

Likes: 1

From: New Orleans

I'd like to know where those chunks of metal went since they're not missing from pin end side of the piston where there is a relief. It's hard to believe the cylinder walls were not damaged.

Mar 27, 2006 | 11:36 AM

#13

VORTECFCAR

Launching!

iTrader: (2)

Joined: May 2005

Posts: 285

Likes: 0

From: Rochester Mn

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

Mar 27, 2006 | 11:58 AM

#14

Fireball

TECH Senior Member

iTrader: (21)

Joined: Nov 2001

Posts: 8,484

Likes: 0

From: Cecil County Raceway!!!

Quote:

Originally Posted by VORTECFCAR

when my #7 failed that is what happened, pieces were held in place by the rings.

Mar 27, 2006 | 12:37 PM

#15

slowpoke96z28

TECH Addict

iTrader: (2)

Joined: May 2005

Posts: 2,099

Likes: 9

From: cedar hill, tx

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.

Mar 27, 2006 | 04:44 PM

#16

BES Stroked Nova

TECH Fanatic

iTrader: (24)

Joined: Oct 2004

Posts: 1,442

Likes: 2

From: Lawrenceburg Indiana

my buddies 01 ws6 has the same thing on #5..... no power adder.

ohh well **** happens

Jun 4, 2006 | 10:41 AM

#17

ramairws6

9 Second Club

iTrader: (33)

Joined: Sep 2004

Posts: 2,013

Likes: 85

From: Hicksville MN!

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