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Old 03-21-2011, 11:06 PM   #91
Springbuck
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I also thought it was a clearance issue, but both block and pistons are STD. I cannot complain about the place I bought the stuff. They have been fair to me all along. I thought it was valvetrain related as well until I saw (very small) metal pieces in the bottom of the sump so I took the head off. If it was a lubrication issue I would think the rod bearings would go first, but that was not the case. Also the edges where it broke is not "burned" or smooth, it is very rough like it was just broken off. I also cannot understand why the worst scoring is at the bottom of the cylinder almost like the piston got stuck canted to one side. I was lucky that the broken piece did not damage my turbo. It looks like it went out without hitting anything. All the blades look fine. The seals from the intake are also all still there so it was not those that could have blocked the intake port. In any case if one of those got loose I would expect 1 cylinder to be affected not 3 of the 4.

This has been a bit of a ordeal. First the stock SVT breaks its ring lands, then one of the spings on the SPEC clutch plate breaks a loose and I have to take it all apart, then it starts running nicely and this happens. This is the 4th time I had to pull the motor or transmission out.

I am going to use the original SVT block once I get new pistons, but I am going to ask for some local help to put it all back together again. I am tired and its a pain doing it all alone :)
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Old 03-21-2011, 11:40 PM   #92
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That sucks man. Sorry to see all that. To me is almost looks like you had defective pistons. It seems like the pistons weren't perfectly round and the two spots were rubbing the cylinder walls. Just a guess.
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Old 03-22-2011, 12:17 AM   #93
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Spec clutches are junk your not the first ive seen that happen to.
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Old 03-22-2011, 12:28 AM   #94
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Was there any valve or head damage?
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Old 03-22-2011, 09:46 AM   #95
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Quote:
Originally Posted by iroc34 View Post
Was there any valve or head damage?
I saw no valve or head damage.
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Old 03-22-2011, 01:55 PM   #96
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I still feel this was heat related , Cyl temp not water temp

Tom
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Old 03-22-2011, 02:20 PM   #97
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I still feel this was heat related , Cyl temp not water temp

Tom
Quite possible Tom, but from what I was told in the case of that kind of heat issue you are talking about there would be score marks in the middle of the piston skirt in addition to burn marks on the pistons and cylinder walls. All references I found with the seize marks on either side of the skirt (thus 4 clear seize marks) the number 1 issue is incorrect piston clearance. I am not saying that is the issue, I am going to check if that was a factor. I am taking the block and pistons to have that checked. In the mean time I am going to rebuilt my original SVT block.
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Old 03-22-2011, 04:37 PM   #98
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I cant believe that with the amount of scoring and damage that the engine was still running. And good enough that you believd it was only needing a bucket adjustment...Sounds like your on the right trail, pistons over sized and a stock bore...
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Old 03-22-2011, 06:04 PM   #99
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When a piston gets as hot as I think yours did they will distort and change shape , what we need to find is what caused this

Tom
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Old 03-22-2011, 06:18 PM   #100
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I remember John had a chunk of piston melt off because his J&S malfunctioned and made his EGTs skyrocket. Plausible?
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