No Compression on Cylinder #7 ??

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Oct 23, 2007 | 10:35 AM

#21

jovette

Melting Slicks

Joined: Feb 2006

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From: Des Moines Iowa

Quote:

Originally Posted by Millenium Z06

Theres no may to it; you need to replace all the rings on all the pistons, not just that one thats not good practice.

Did you make sure you had the throttle body, fly by wire, butter fly air valve opened fully when you were cranking the engine over when performing the compression tests? You will get much lower readings if the throttle plate is not wide open.

Oct 23, 2007 | 10:45 AM

#22

BonestockZ06

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Drifting

Joined: Apr 2007

Posts: 1,848

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From: Central Florida

Quote:

Originally Posted by jovette

No I did not do that. I wasn't aware of these facts. I suspect thats the cause of the lower readings. However, #7 was dead completely. Thanks, that makes me feel somewhat better knowing that had I done this the reading would have been higher.

Thanks for the info

Oct 23, 2007 | 10:50 AM

#23

gdphillipsvette

Burning Brakes

Joined: Nov 2004

Posts: 961

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From: Albuquerque NM

Quote:

Originally Posted by BonestockZ06

pour water in the cylinder, it swallowed it as fast as I poured it in. I checked all on drivers side the same way and that was the only one thirsty.

Pour water into the cylinder? I've never of such a test procedure! But if water is going through that fast, sounds more like a ring land is broken or a hole in the piston.

Gordon

Oct 23, 2007 | 11:01 AM

#24

Millenium Z06

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Quote:

Originally Posted by gdphillipsvette

Pour water into the cylinder? I've never of such a test procedure! But if water is going through that fast, sounds more like a ring land is broken or a hole in the piston.

Gordon

I'd pull the head(s) before I started buying parts.

Oct 23, 2007 | 11:18 AM

#25

BonestockZ06

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Drifting

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From: Central Florida

Quote:

Originally Posted by Millenium Z06

I'd pull the head(s) before I started buying parts.

The heads are off, the test was done with the heads off. It's very simple, if you don't see a whole or a crack on the piston and the head is fine, then pour something in there (water, antifreeze or oil) and wallahhh. I use to see my mentors do such things when I was a kid and still proven till this day.

Oct 23, 2007 | 02:29 PM

#26

Millenium Z06

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Whats the piston and the cylnder look like?

Oct 23, 2007 | 02:51 PM

#27

clif

Melting Slicks

Joined: Jul 2007

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From: Simpsonville SC

St. Jude Donor '09-'10

Quote:

Originally Posted by BonestockZ06

Can you post some pics of your work? We can all learn something from your experience!

Oct 23, 2007 | 03:02 PM

#28

BonestockZ06

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Drifting

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From: Central Florida

Quote:

Originally Posted by Millenium Z06

Whats the piston and the cylnder look like?

I should have it completely out by tomorrow night, i'll post the findings.

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Oct 23, 2007 | 03:08 PM

#29

BonestockZ06

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Drifting

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From: Central Florida

Quote:

Originally Posted by csdunaway

Can you post some pics of your work? We can all learn something from your experience!

Here are some great links for yaa.. Step by step with plenty of pictures. I followed the same exact procedures, step by step. It did help some that I been working on cars for 15+ years and have a 2 car garage with most tools needed for any job.

http://www.cajundude.com/engineswap.htm

http://www.ls1howto.com/index.php?article=1

Oct 23, 2007 | 10:01 PM

#30

Millenium Z06

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Is it just the angle or does that piston look like there is no ring left on the front side of it and it's dragging the cylinder? (The front is where the dot is) Is the piston loose in the cylinder?

Oct 23, 2007 | 10:23 PM

#31

BonestockZ06

Thread Starter

Drifting

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From: Central Florida

Quote:

Originally Posted by Millenium Z06

Is it just the angle or does that piston look like there is no ring left on the front side of it and it's dragging the cylinder? (The front is where the dot is) Is the piston loose in the cylinder?

It's not the angle, your observations are correct. I should have it out tomorrow. However, I guess since I caught It right away, I may have saved the cylinder wall from damage.

Since you mentioned that, I went out and looked at all 8 and they all looked identical. The side with the dot seems to have no clearance against the wall (at least not visible to the eye). So I don't think that means much.

Last edited by BonestockZ06; Oct 23, 2007 at 10:30 PM.

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