Bennett124

Alright so my s2000 has been running just fine I have had no problems at all with it. The motor has about 10k miles of being turbo charged on the fresh build with CP 9:1 compression pistions in it and I wanted to do a compression check on it just for piece of mind. I just finished and this is what I came up with.
What do you guys think about the numbers?
#1-145
#2-150
#3-145
#4-140

And yes I did drive the car around until it got up to operating temperature.

Spoolin

The numbers are all fairly close together which is good but they seem too low for 9:1 CR. Shouldnt they be closer to 180's?

siadam

I'd think, but I bet he didn't hold the throttle to the floor, I've seen taht cause low numbers.

It's hard for the motor to pull any air through a closed TB.

Spoolin

Oh yeah, you are correct there. I hadnt thought of that but I bet youre right. Good call. SO, if thats the case, then he should be good to go as all the numbers are fairly consistant.

m R g S r

all testers read differently. be concerned with the % difference between the highest and lowest. if they are really all that low, then maybe something is wrong with the HG sealing, but you would have coolant/overheating issues if that were the case.

Bennett124

Yes I did hold the throttle open all the way when I was doing the test. I will try to get my hands on another compression gauge and see if the numbers change at all.
Is the somewhat low numbers something I should worry about or not so much?

spectacle

If it drives fine I wouldn't worry too much about it

dsddcd

If you want a real idea of what is going on you need to do a leak down test. Here is one I made that works quite well.

civicej8

what kind of headgasket do you have? im sorry i might of missed that.

Deception

stock HG w/ 9:1 pistons