compression test, quick question

[Lynx331]

Im doing a compression test on my 87 gt, how exactly do i do it? How many times do i crank it? Because i cranked it about 10 times and ended up with 180 psi out of cylinder #1. How exactly do i do it?

 

[maverick0716]

Take out all the spark plugs so it's not as hard on the starter to turn the engine. For each cylinder you should only have to have it turn over 2-3 times...Just until the guage keeps saying the same thing I guess.

 

[1986LX2002]

make sure the throttle body is opened all the way to let air in to be compressed. I dont know the exact number on what the compression numbers should be.

 

[Lynx331]

well ive did 2 cylinders so far on the drivers side, and have gotten 180, and 185.....

 

[1986LX2002]

here you go, found this off google.com

http://www.motorage.com/motorage/article/articleDetail.jsp?id=16170

 

[HISSIN50]

the absolute numbers (if within reason) are not so important as the fact that they should be close in proximity (within 10%). there are enough differences in how people do the tests, it can mess results up.

you can do a wet test after the dry test to check the rings. the larger the delta, the more blowby you got.

good luck.