I've got a 97 Type-S bottom end (11:1 cr) with a OBD1 head. What compression numbers should I be seeing when I do a compression test?

I just bought a compression tester and I need to know what numbers I should be within.

Also, Should the engine be warm or cold?

 

no way for us to tell you. different gauges will read the numbers differently. The key is having all cylinders within a close proximity.

 

At sea level with stock cams my Type-S block/OBD1 H22A1 head made about 245psi in each cylinder years ago. But remember that every compresion tester will be different and consistancy between cylinders is probably more important.

Pirate

*damn, Blake beat me to it*

 

aaarrrggggg!!!

 

I'd suggest doing it when its warm. Your car runs mostly while warmed up. Anywhere in around 200 is average. As they both stated (almost in a duet) as long as they are withen 10 psi (10 is still a bit off in my personal opinion but that wouldn't indicate anything wrong to my knowledge) of eachother, theres nothing to worry about!

Just so you know too, I think you only need to crank the car like 3-4 times (or atleast thats all I had to do to get an accurate reading, but mine also storred the reading)? Some guys here suggested to crank it like 10 times and I never thought anybody had to crank their car that many times to get a reading. After 3 cranks it went up to 187 (on my h23) and even with a few more, It didn't fluctuate much so I'd assume it only takes a couple cranks.

 

I was in between 260 and 270 all the way across.

As far as how many cranks, it took me at least 5 or 6 to get it up to a constant pressure.

 

Sounds good to me.

 

Thanks for the input guys.