Compression Test Results

Wileyk24 · 03-12-2012, 02:32 AM

Hey guys, I just picked up an 87 turbo in December. Had some really nice weather lately so I decided to give her a tune up. I replaced the air filter, spark plugs, spark plug wires, and since I had to pull off so much crap to get to the damn plugs I went ahead and did the valve cover gaskets as well.

While I was in there I figured I would do a compression test too. Here is what I found.

no. 1 cylinder - 180 psi
no. 2 cylinder - 185 psi
no. 3 cylinder - 165 psi
no. 4 cylinder - 165 psi
no. 5 cylinder - 170 psi
no. 6 cylinder - 185 psi

I like how high the readings came back. I performed the test on a cold engine and cranked 7 times for each cylinder. However, I am not sure if I should be concerned with the large difference on cylinders 3 and 4 vs the rest. The guy I bought it from has records that I haven't picked up yet, but he said the HG was done already. Its a super clean car with 91000 miles.

What do you guys think? Thanks in advance.

cre · 03-12-2012, 02:40 AM

A cold test is unreliable. Do it again with the engine warmed up as much as possible while still permitting you to handle it... It's best to do this by running it up to operating temp and letting it cool a bit with the hood open or work with gloves. This allows the components to cool enough to handle on the outside while the internals remain warm.

03-12-2012, 02:32 AM	#1
Wileyk24 Stock Join Date: Dec 2011 Location: Middletown, NY Posts: 27	Compression Test Results Hey guys, I just picked up an 87 turbo in December. Had some really nice weather lately so I decided to give her a tune up. I replaced the air filter, spark plugs, spark plug wires, and since I had to pull off so much crap to get to the damn plugs I went ahead and did the valve cover gaskets as well. While I was in there I figured I would do a compression test too. Here is what I found. no. 1 cylinder - 180 psi no. 2 cylinder - 185 psi no. 3 cylinder - 165 psi no. 4 cylinder - 165 psi no. 5 cylinder - 170 psi no. 6 cylinder - 185 psi I like how high the readings came back. I performed the test on a cold engine and cranked 7 times for each cylinder. However, I am not sure if I should be concerned with the large difference on cylinders 3 and 4 vs the rest. The guy I bought it from has records that I haven't picked up yet, but he said the HG was done already. Its a super clean car with 91000 miles. What do you guys think? Thanks in advance. Last edited by Wileyk24; 03-12-2012 at 02:35 AM. Reason: more Info

03-12-2012, 02:40 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	A cold test is unreliable. Do it again with the engine warmed up as much as possible while still permitting you to handle it... It's best to do this by running it up to operating temp and letting it cool a bit with the hood open or work with gloves. This allows the components to cool enough to handle on the outside while the internals remain warm. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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