Compression Test** - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
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post #1 of 15 (permalink) Old 07-20-2011, 11:02 AM Thread Starter
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Compression Test**

Hello I recently did a compression test because I have a big oil leak and I am trying to determine what the problem is. Here are the numbers.

Test 1 without throttle..
Cyl 1: 135
Cyl 2: 170
Cyl 3: 160
Cyl 4: 100

Test 2 with throttle to the floor and semi warm engine..
Cyl 1: 150
Cyl 2: 180
Cyl 3: 170
Cyl 4: 90

Also in the middle of the test I had to keep recharging the battery so IDK if that effected the numbers. I am going to buy a new battery and redo the test again. If the numbers stay the same what should I do???
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post #2 of 15 (permalink) Old 07-20-2011, 11:20 AM
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What I read is that no cylinder should be reading less than 100psi and that is on the LSJ. I do not know about the set up you have. SC with a turbo swap should be the same. Looks like the first three cylinders are leaning and the 4th is flooding. Check the injectors.

EDIT!!

Your compression test should read at least 100psi per cylinder and no more than 30 difference in each. So do check the injectors but the informations imply that you have either a bad valve or piston rings which would explain all the smoke and oil leak.

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Last edited by RedSStreak; 07-20-2011 at 11:40 AM.
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post #3 of 15 (permalink) Old 07-20-2011, 11:47 AM Thread Starter
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Thanks for your input and mechanics keep telling me i may need new piston rings.. I may just order those and put them all in.
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post #4 of 15 (permalink) Old 07-20-2011, 11:48 AM Thread Starter
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Oh yeah and how would I go about ordering the right size piston rings? Do you think the rings are different from stock sc since the car was converted to a turbo? And any good websites that are recommended?
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post #5 of 15 (permalink) Old 07-20-2011, 11:50 AM
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I highly doubt it because you did not change the dimensions on the block right?? No bore over more specific....

If it is the stock 2.0L Supercharged only with your exception of the SC delete in replace of the turbo, then all parts still fall under the LSJ.

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post #6 of 15 (permalink) Old 07-20-2011, 01:31 PM
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u all have succeeded in making me feel dumb with this lmao


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post #7 of 15 (permalink) Old 07-20-2011, 01:36 PM
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Thank you, that is my job

If it wasn't for people like me.......... Well lets just say we don't talk about that.

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post #8 of 15 (permalink) Old 07-20-2011, 02:47 PM
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lololol my job is to make cars look pretty *hahahaha *


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post #9 of 15 (permalink) Old 07-20-2011, 02:56 PM
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And you have been stingy enough only to do it to yours....

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post #10 of 15 (permalink) Old 07-21-2011, 05:42 PM
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Quote:
Originally Posted by RedSStreak View Post
And you have been stingy enough only to do it to yours....
hahahaha ! not true. ive done mine. my girls . guy across the street, and parents


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