ONE Piston gone
Thread Starter
Racer
Joined: Jul 2008
Posts: 273
Likes: 2
ONE Piston gone
Hi gents,
A friend of mine who installed in his 6.0L sealed power pistons with comp cam and I can't remember what is the spec of that cam. He tuned his car and tested it more than seven times on street from 0 to 120 mph. After that, he noticed a sound came from the engine. what do you think caused the piston to go away?!
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A friend of mine who installed in his 6.0L sealed power pistons with comp cam and I can't remember what is the spec of that cam. He tuned his car and tested it more than seven times on street from 0 to 120 mph. After that, he noticed a sound came from the engine. what do you think caused the piston to go away?!
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Last edited by lingenfelter200; Nov 17, 2012 at 01:18 PM.
Melting Slicks
Joined: Feb 2006
Posts: 2,163
Likes: 5
From: Houston
If he shut it down pretty quick after that last pull, and those are timing marks near the threads that I see, it would seem he detonated from too much timing. Pretty hard to make that call from pics though.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
That is about the worse I have seen in a motor. Plus really looks lean. Hate it for him tell him next time to get a good tuner that know what he is looking at on HP TUNERS. 
Robert
AKA "The CLOWN"
Joined: Feb 2010
Posts: 6,261
Likes: 13
From: Chicago South Suburbs
Thats a piston?
I am no pro in any way but that is the worst failure I've seen.
That piston looks like a fossil clump of some kind!
Very sorry for the failure, these threads make me said!
I am no pro in any way but that is the worst failure I've seen.
That piston looks like a fossil clump of some kind!
Very sorry for the failure, these threads make me said!
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
That sucks. It looks alot like one I blew up. Mine was a destructive chain of events with rod and piston failure. Lots of parts looked (and sounded) like they went thru a garbage disposal.
Team Owner
Joined: Jan 2007
Posts: 29,063
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From: cookeville tennessee
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
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Right off you can see the following:
The red arrow shows the timing mark for this plug which indicates too much timing.
The green arrow shows where the timing mark should be, right at the apex of the bend on the ground strap.
The yellow arrow is pointing to the porcelain which looks very white with hardly any fuel deposits and could indicate not enough fuel. The picture is out of focus so it's hard to get real specific.
The red arrow shows the timing mark for this plug which indicates too much timing.
The green arrow shows where the timing mark should be, right at the apex of the bend on the ground strap.
The yellow arrow is pointing to the porcelain which looks very white with hardly any fuel deposits and could indicate not enough fuel. The picture is out of focus so it's hard to get real specific.
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
Also, testing from 0 to 120 on a new combination is a very aggressive way to try and dial the car in.
What is the:
Compression ratio?
N/A or forced induction?
A/F ratio?
timing at WOT?
Fuel Octane?
Meth Injection?
What is the:
Compression ratio?
N/A or forced induction?
A/F ratio?
timing at WOT?
Fuel Octane?
Meth Injection?
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Thread Starter
Racer
Joined: Jul 2008
Posts: 273
Likes: 2
2. N/A.
3. I can't remember what was the AFR, I have to ask the tuner.
4. It's 23 deg - EFI-live tuner.
5. 91.
6. No Meth.
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Last edited by lingenfelter200; Nov 18, 2012 at 11:52 AM.
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
Ive damaged engines through detonation and all sorts over the years. IMO that is not detonation damage.
I'm not saying the tune was either right or wrong, but IMO the tune isnt what killed it.
Was the wrist pin in one piece ? ( if one was even fitted lol ) Post a picture of another piston, side view, underside, to see how it is constructed. And post a good picture of the bore itself.
I'm not saying the tune was either right or wrong, but IMO the tune isnt what killed it.
Was the wrist pin in one piece ? ( if one was even fitted lol ) Post a picture of another piston, side view, underside, to see how it is constructed. And post a good picture of the bore itself.
Drifting
Joined: Aug 2006
Posts: 1,629
Likes: 6
From: Little Rock Arkansas
32 degrees? Did you mean 23?
I have seen rod bearings stack and jerk the pin from the piston and do just like that. Look at the rod bearing on that hole. 32 degrees N/A was bad but I don't see it taking out a piston like that.
I have seen rod bearings stack and jerk the pin from the piston and do just like that. Look at the rod bearing on that hole. 32 degrees N/A was bad but I don't see it taking out a piston like that.
Thread Starter
Racer
Joined: Jul 2008
Posts: 273
Likes: 2
Cruising
Joined: Nov 2012
Posts: 13
Likes: 2
no force induction, about the fuel ratio they didn't tell me, I'll try to get some information to the tuner later and the timing at WOT, by the way am the one who build the engine. Octane I think 96. The cam shaft is LIVERNOIS 2C.
Cruising
Joined: Nov 2012
Posts: 13
Likes: 2
correction: about the octane he's using cause here in UAE
95 octane here in US its only 91 octane rating and the 98 octane here is only 93 octane in the US.
So Lingenfelter earlier mention is correct only 91 octane.
95 octane here in US its only 91 octane rating and the 98 octane here is only 93 octane in the US.
So Lingenfelter earlier mention is correct only 91 octane.
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
And were both circlips installed at the time of build ?
I can only see this as being a build problem, or a very remote chances of the piston being defective somehow. That's re-enforced even more when you say this is a normally aspirated engine.
I can only see this as being a build problem, or a very remote chances of the piston being defective somehow. That's re-enforced even more when you say this is a normally aspirated engine.
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
The failure you have is very extreme. IMO, no amount of bad tuning could cause it, especially on a n/a engine.
And again backed up by the fact the valves still appear to be intact in the head, so it isnt a failure relating to a dropped valve etc.
The rod itself has not broken, although clearly it is now in a bad way.
Post pictures of the other good pistons. But it sill looks like a build issue to me.
And again backed up by the fact the valves still appear to be intact in the head, so it isnt a failure relating to a dropped valve etc.
The rod itself has not broken, although clearly it is now in a bad way.
Post pictures of the other good pistons. But it sill looks like a build issue to me.