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Old 03-22-2011, 06:44 PM   #101
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Sure it is , we have talked about checking the J&S and the wide band both

Tom
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Old 03-22-2011, 07:30 PM   #102
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Quote:
Originally Posted by 1turbofocus View Post
Sure it is , we have talked about checking the J&S and the wide band both

Tom
Correct, I am not discounting anything. The one reason I do not think it is tune or EGT issues is the problem surfaced after a 100mile trip of constant 70mph driving. Before that it was fine and I do not believe that 3k rpm and 70mph can cause that high EGT's. Also with high EGT's will the score marks be more on the exhaust side or at least burnt on the exhaust side? It will be a little while before I get it running though. Need to take my SVT block and crank in to be measured to see if I can get away with a hone only. The original SVT block looks a whole lot better than this new block. It has no ridges or marks anywhere even after almost 100k miles even the rod bearings look newer on the SVT block. The number 4 cylinder has deep score marks on the bottom on the "built" block and also on 2 and 3 although to a lesser degree.
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Old 03-22-2011, 07:33 PM   #103
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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?
Yes, but as I recall he went all out to find what was causing his issue. I did not drive mine very hard at all.
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Old 03-22-2011, 09:30 PM   #104
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Whatever you do, dont put new pistons on your svt internals... just sayin.

Hopefully you can get your other block fixed up quickly. I know how it goes when you get your engine together to just have to tear it apart again...and again...

If I lived closer I would be there to help.
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Old 03-22-2011, 10:14 PM   #105
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Whatever you do, dont put new pistons on your svt internals... just sayin.

Hopefully you can get your other block fixed up quickly. I know how it goes when you get your engine together to just have to tear it apart again...and again...

If I lived closer I would be there to help.
Thanks :) I will be using the Eagle rods I had in the seized block with some new pistons.
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Old 03-28-2011, 08:45 AM   #106
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Well I took 2 of the pistons to a engine builder, engineering shop and they told me it is clear that the piston seized because clearance was not enough. I am taking him the block and crank to look at to mic it for size with the pistons.
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Old 04-11-2011, 04:52 PM   #107
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Any new info from the machine shop?
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Old 04-12-2011, 06:47 PM   #108
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He said he would have something for me this week. They are busy on my head and we are waiting on the new pistons to bore the original SVT block. I went with the JE ones that are 27thou oversize.
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Old 04-23-2011, 11:19 AM   #109
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What we found was that pistons 1-3 had between 3 and 5 thousands piston clearance. Piston 4 (most seized one) had 15 thousands clearance across the middle of the skirt. There are no seize marks on the middle of the skirt as you would expect with a overheated piston. The marks are on the edges of the skirts. All the cylinders was within spec. In cylinder 4 most of the seize marks are on 1 side of the cylinder at the bottom and the other side at the top.
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Old 04-23-2011, 11:26 AM   #110
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On another note we are rebuilding my SVT block at 85.5 mm oversize with 9.0 JE pistons and a 0.066 Cometic head gasket to get it to 9.0 compression ratio. Crank is still standard. Got a set of ARP head studs as well. Head is also being redone with guides and a grind and getting it square. Using the Eagle rods from the seized block.
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