What to do about engine now... - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 13th, 09, 04:58 PM Thread Starter
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Matt
 
Join Date: Jan 2004
Location: Saint Marys, GA
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What to do about engine now...

OK, so the guy who built my engine is saying he thinks the rings are bad in the #5 cylinder because all the other cylinders have about 150psi and that one has about 30psi.

He said the piston might be bad and the cylinder wall might be scratched but wont know until he tears it down next week.

My question is: If the piston is bad should I replace just the one piston (if I can even do that) with the same type hypereutectic piston or replace them all with a forged piston set? I am on a budget and the rest of the rotating assembly is a balanced eagle kit. If I should go the forged route what brand should I go with?

If the cylinder wall is messed up should I have him put a sleeve in that cylinder or have the block punched out to .60 over. It was a stock 350ci and just before the build it was punched out to .40 over. This is worse case.

Also, feel free to comment on any other considerations I should make since I am hoping this is the last time the engine will be out of the car. With in reason of course.

Thanks again for everyones imput. You guys are great!

Matt
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post #2 of 5 (permalink) Old Mar 13th, 09, 05:06 PM
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John
 
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Wink Re: What to do about engine now...

The rings would have to be missing to get that low a reading
I'd look at valve or piston issue before anything else.
Time to pull the head and quit guessing

Yes, you can replace one piston - GM did it all the time - but, you need to know why it failed first...
I would scrap the block if the cylinder is so damaged it needed a sleeve - blocks are much cheaper and easierto replace unless it is a "numbers" casting you need to keep.
I have pulled several engines apart with one or two cylinders bored over the others, never could fiqure out why someone did it - you may have just explained it to me
btw - they both ran just fine but were worn-out and needed a rebuild - really threw a wrench in the works when the one need a new block...

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Other V8 things - some of which float
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Other V6 things - none of which float
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If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
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post #3 of 5 (permalink) Old Mar 13th, 09, 05:22 PM Thread Starter
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Matt
 
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Re: What to do about engine now...

I think he is going to tear it completely down anyway so I will make sure he does a GOOD once over when it is apart.

Would having a bad valve put enough psi into the crank case to make it spit oil all over my headers?
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post #4 of 5 (permalink) Old Mar 13th, 09, 05:42 PM
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Ron
 
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Re: What to do about engine now...

If you're on a tight budget then just have the cylinder in question bored out....You may need to get everything rebalanced though!.....I had a 396 and upon pulling the heads, I noticed that only 1 cylinder was bored out .030" over, so that won't be a prob!.....I hope the builder is going to help you out with the cost!
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post #5 of 5 (permalink) Old Mar 13th, 09, 06:51 PM Thread Starter
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Matt
 
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Re: What to do about engine now...

I hope the builder helps out with the cost too!!! Last time I had it up there he charged me $300 bucks because he had to take the engine out and fix teh oil pick up arm that he put on and it fell off. He is already saying that the engine is messed up because I drove the car about 15 miles with little to no oil preasure. (because the pick up arm fell off) Im sure I will not be happy leaving his shop after this.
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