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Engine Build Gone Wrong?

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Old 10-12-2009, 07:29 PM
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Ok get this car went back to the builder and here was the details.

Car used a total of 5qts getting there (4.5hrs)............... She pulled over a few times to check it.
They pulled the plugs and all were soaked in oil
Pulled the intake and it had oil all in it.
Catch can was full of oil.

So guess what they removed the catch can out of the loop and added a filter on the valve cover however this makes really no sense to me. Wife said it stopped smoking. I have still yet to get him to do a leak down test. Its almost like there is something to hide. To top it off he put it on the dyno and made a few pulls with still not understanding why it ate the oil. This is driving me crazy............

Can anyone explain this........
Old 10-12-2009, 08:00 PM
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Get somebody else to look at it....Call Erik or maybe Greg....They are close.....
Old 10-12-2009, 08:00 PM
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Sounds to me like he's hiding something for sure. I'd tear that bitch apart myself and take a peek at what's goin on.
Old 10-12-2009, 09:12 PM
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Originally Posted by Blackhawk777
Sounds to me like he's hiding something for sure. I'd tear that bitch apart myself and take a peek at what's goin on.
I told them direct to do the test and if he does not then I will get it done on my own dime when she gets back. If its found to be a issue someone has hell to pay as everything that can cause a motor to consume oil as rapidly as it does he touched changed or rebuilt. I have bent over backwards so far trying to get this issue solved.

What I think it is.....

1. Rings were gaped wrong.
2. RA on the cylinders was incorrect causing the rings not to seal
3. In correct ring size.

I think it has so much blow by that its pushing the oil into the intake and oil catch can. Its coming from the rings not sealing and the only way you can see this is with a leak down test. A compression check was done and he said it checked good but that does not tell me what % of leakage I have.
Old 10-12-2009, 10:06 PM
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Ok lil update. They made 10 dyno pulls and did not use oil. Car made 390rwhp and I guess this ok???? for a low comp n/a 408 combo thru a auto with a 3800 stall.

Wife is on her way home and will be checking the oil again. If it uses any then she will be back tomorrow and they will rip the out out for a complete rebuild.
Old 10-13-2009, 01:33 AM
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damn does that thing have zero compression?
Old 10-13-2009, 06:46 AM
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Originally Posted by fox16
damn does that thing have zero compression?
Man at this point it makes me sick...... I am out of town for work so I cant do it I am calling around to a few local shops this morning to get it in there for a compression check and a leak down.
Old 10-13-2009, 07:36 AM
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I am damn curious what shop you have been dealing with here in Houston. Have her bring the car to G-Force and I promise they will get you lined out.
Old 10-13-2009, 09:29 AM
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Could be loose fitting pistons too.
Old 10-13-2009, 10:16 AM
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Originally Posted by niceguyyy01
I am damn curious what shop you have been dealing with here in Houston. Have her bring the car to G-Force and I promise they will get you lined out.

I am pretty sure that it isnt in Houston. I think I know where it is but I am not letting the cat out of the bag just in case...

Good luck getting everything worked out!
Old 10-13-2009, 10:49 AM
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It's either the rings were filed incorrectly, or just put on wrong. Each piston/ring has it's own home in each cylinder. Sounds like to me the builder or machine shop didn't do their job.
Old 10-13-2009, 10:54 AM
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Originally Posted by TT632
For the life of me I don't understand why these shops can't do a simple rebuild, unless their is some unknown...bad batch of oil control rings?
Well if you put them in upside down you can't really blame the ring can you?

don't know if thats the case here but you would be surprised at some of the things that get done
Old 10-13-2009, 12:06 PM
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Originally Posted by 1INSANEGTO
lol I never put the kit on the car. Its a N/A 408 now with a 250 shot waiting if we can ever get past the break in
Why would you spray a low compression engine that was built for FI. No doubt the heads and pistons will make for a poor nitrous application.The HP/TQ will be relatively low in comparison to a purpose built 408 nitrous engine,also the engine won't produce much grunt N/A either.
Old 10-16-2009, 03:18 PM
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Originally Posted by david vericker
Why would you spray a low compression engine that was built for FI. No doubt the heads and pistons will make for a poor nitrous application.The HP/TQ will be relatively low in comparison to a purpose built 408 nitrous engine,also the engine won't produce much grunt N/A either.
Long term goal is FI. Before it was Stock ci with Nitrous. There is over 5k with of nitrous stuff on the car and I would never get that out of it so why remove it? Plus it all came with the car when it was bought.

Ok the builder wanted it back however I had a leak down and compression check done on the motor by a 3rd party.

Cylinder #1 10%
Cylinder #2 20%
Cylinder #3 8%
Cylinder #4 8%
Cylinder #5 5%
Cylinder #6 20%
Cylinder #7 10%
Cylinder #8 10%

Compression was 145-150.

So everything is within range from what I know besides cyl 2 & 6. Guy pulled the plugs looked caked up with oil crap. Thinks its not venting enough for the crack case.

Why would I be having excessive crankcase pressure?

Last edited by 1INSANEGTO; 10-16-2009 at 03:24 PM.
Old 10-16-2009, 03:20 PM
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With that much leakage of course its going to be using oil.Pull the oil cap off with the engine hot and hold the rpms at 2500...how much smoke comes out?
Old 10-16-2009, 03:25 PM
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What should the leakage be on a new motor let me ask that
Old 10-16-2009, 03:27 PM
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If i paid a machine shop to build a engine it better be less than 8% ...10% absolute MAX!

Leaking 10% of your combustion into crankcase is like pouring CRAP into your oil...engine aint gonna last veryt long!

I bet your oil looks dirty fast.
Old 10-16-2009, 03:33 PM
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I really hate to tell you this....anything over 5% is too much. I hope you get it solved with out too much stress on you.

Thats also why your compression is a little low..i would expect at least 160 arcross ALL the cylinders in a fresh motor.
Old 10-16-2009, 03:40 PM
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Originally Posted by 99RTA
If i paid a machine shop to build a engine it better be less than 8% ...10% absolute MAX!

Leaking 10% of your combustion into crankcase is like pouring CRAP into your oil...engine aint gonna last veryt long!

I bet your oil looks dirty fast.
So this sums it up.
Cylinder #1 10% OK but pushing it
Cylinder #2 20% BAD
Cylinder #3 8% GOOD
Cylinder #4 8% GOOD
Cylinder #5 5% Very GOOD
Cylinder #6 20% BAD
Cylinder #7 10% OK but pushing it
Cylinder #8 10% OK but pushing it
Old 10-16-2009, 03:44 PM
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I know it sux butt i was trying to nice....sorry dood.



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