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Old 09-19-2010, 12:29 AM   #1
340Duster
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Default Victim of Det?

I read mostly about cracked ringlands on the pistons, or spun bearings. It looks more like a lean condition on the cyl. Trying to figure out exactly what caused the erosion of the piston/ it melting to the bore. Sorry the second pic is from my phone.



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Old 09-19-2010, 12:33 AM   #2
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Were those marks in the cylinder, or it that from you trying to free it up??
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Old 09-19-2010, 12:36 AM   #3
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Thats aluminum of the piston melted onto the steel of the bore. The engine was running when I pulled it.
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Old 09-19-2010, 10:08 AM   #4
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Nothing?
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Old 09-19-2010, 10:14 AM   #5
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Probably. Its not like there are a whole lot of possibilities here. What mods were you running?
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Old 09-19-2010, 04:18 PM   #6
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Looks somewhat familiar... I'd start by getting your injectors checked out. Looks like cylinder 3???

Here is mine:
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Old 09-19-2010, 07:42 PM   #7
340Duster
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Quote:
Originally Posted by yaya20 View Post
Looks somewhat familiar... I'd start by getting your injectors checked out. Looks like cylinder 3???

Here is mine:
Thats exactly what I came up with today, I think its an injector failure, but Idk... I suppose #3 is more prone because its probably the hottest running cylinder. I have pictures to add.
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Old 09-19-2010, 07:47 PM   #8
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I think it ran lean and melted the piston, but thats my guess, I'm looking for other opinions
It was a Cobb stage 2, then was open source tuned to run 18-19 psi on just a ported TD04. I have a large TMIC, short ram and exhaust. Thats pretty much it for engine mods.



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Old 09-19-2010, 08:18 PM   #9
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Man thats not fun.
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Old 09-19-2010, 08:22 PM   #10
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I wish I could give you more info. I just got the results from my injector test last week and they were fine. Mine was a built ej205.

The clean piston top makes it look like the cylinder wasn't getting fuel. But it's possible that after the loss of compression the heat and the fuel washed away a lot of the carbon build up. Injector is the first thing I would check. After that I'm all ears.
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Old 09-19-2010, 08:23 PM   #11
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Here is my cylinder wall too:



My motor has not been broken down yet as I doubt anything in it will get reused.
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Old 09-19-2010, 08:37 PM   #12
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Yeah I am right now looking to find someone to flow test them. I'm working on a new build, only the cams from that engine are being reused. I need to figure out what caused this though. Next is to post this to the built motor discussion, people with more engine experience hang out there.

Quote:
Originally Posted by yaya20 View Post
I wish I could give you more info. I just got the results from my injector test last week and they were fine. Mine was a built ej205.

The clean piston top makes it look like the cylinder wasn't getting fuel. But it's possible that after the loss of compression the heat and the fuel washed away a lot of the carbon build up. Injector is the first thing I would check. After that I'm all ears.
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Old 09-19-2010, 08:52 PM   #13
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I suppose a bad coil could be an issue, but I would think you would have misfires before it got to that point of destruction.
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Old 09-20-2010, 01:11 AM   #14
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Yeah there was no CEL at all or anything other than the loss of power when the compression went to almost 0.

Have you had your tune looked at or the car logged for any issues on that side of things?

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I suppose a bad coil could be an issue, but I would think you would have misfires before it got to that point of destruction.
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Old 09-20-2010, 01:24 AM   #15
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Old 09-20-2010, 09:48 AM   #16
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Quote:
Originally Posted by 340Duster View Post
Yeah there was no CEL at all or anything other than the loss of power when the compression went to almost 0.

Have you had your tune looked at or the car logged for any issues on that side of things?
I had no previous CEL either. I was on the highway at about 15psi and building boost then boom and no power. I literally had zero compression in that cylinder.

I have not had the tune looked at by anyone other than the original tuner and no logging as the car was run as little as possible since the incident.

Interesting article btw.
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Old 09-20-2010, 01:28 PM   #17
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Same here, except it was around 19psi, and I had the tuner go over the map, He said all the AFR numbers and timing were within the normal range for the setup I was running. So

Quote:
Originally Posted by yaya20 View Post
I had no previous CEL either. I was on the highway at about 15psi and building boost then boom and no power. I literally had zero compression in that cylinder.

I have not had the tune looked at by anyone other than the original tuner and no logging as the car was run as little as possible since the incident.

Interesting article btw.
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Old 09-20-2010, 01:56 PM   #18
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Sounds like we are in the same boat. I'm going to see about maybe tearing down my block pretty soon and see how the skirts and rings look on the rest of the pistons. Maybe something that can show me if it was tuned too rich.

Hopefully some other folks will chime in here with some ideas.
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Old 09-20-2010, 02:34 PM   #19
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No I agree, I don't see how too rich would cause it though? I could see in the case of a bad injector, the AFR was in line with by running 3 cyls rich and one lean. That was my earlier thought.
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Old 09-20-2010, 03:42 PM   #20
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The article you linked described how it would be possible in a situation that is overly rich...
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Old 09-20-2010, 05:12 PM   #21
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Yeah, I just don't understand the lifting of the ringland, I would think in a cast piston it would simply crack. People talk about tiny amounts of fuel getting combusting and blowing the ring lands all the time.

Where's Soobaviator when you need him?
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Old 09-21-2010, 10:16 AM   #22
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If the ring were to get pinched and allow enough oil to get into the combustion chamber, then there would be detonation. Now, if the oil was to pool a little on the bottom then start to combust (oil burns hot and slow), then I could see it melting a piston in the location we both had it happen in.
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Old 09-21-2010, 10:51 AM   #23
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Did this thing have a blown head gasket on that cylinder?
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Old 09-21-2010, 08:27 PM   #24
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Nope, head gasket was good. Has no one else melted a piston in one of these engines?

And does that seem like a rich problem or an oil control problem? how many miles were on your engine before it died?
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Old 09-21-2010, 11:56 PM   #25
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3 is the leanest cylinder and if the injector failed on 3 then the lack of fuel would be the problem. unless tthe rings were that bad then there would not be enough oil blow by to cause that. noow the guy with the built motor if the builder did not properly stager the ring groves then detenation could have ccaused yours but other than that. i would look at injectors if a coil goes bad then it wouldnt fire it fire unless told to do so. then that would be a computer problem. so guy i would have some one else look at the tune other than the orignal tuner he would not admit he messed up no matter what. to lean on that cylinder is what will cause that because it is the hottest cylinder and to rich wont huurt anything but power.
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