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.

 

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?

 

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.

 

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.

 

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.

 

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?

 

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

 

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.

 

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

 

stock HG w/ 9:1 pistons