I did a compressin test in a s2k that im thinking of buying and I get 180 to 185 psi. Is that bad? Is 2001 with 80000km

 

From service manual:
Check at 250 RPM with wide open throttle.

Nominal: 228 PSI
Minimum: 135
Max Variation: 28 PSI

If you checked all of them and they are all fairly consistent with 180-185 then according to the numbers you should be fine. Aslong as there isnt any crazy numbers like 150-200-203-196. If I was in the situation id look to see the service history and look around for any other anomalies. You can take it to a shop and they'll do a 150 point (or whatever is) inspection for a few hundred bucks and they'll look over everything. Definitely worth spending the money vs spending more money down the road. A few hundred is pricey, but gives you piece of mind

 

yea i got all 190's but many things can affect the compression, as altitude, engine temp, etc. if the numbers are all close together you can say its a healthy engine.

 

Doesn't it also depend if they were read warm or not warm? OP: Those numbers are an indication that motor's in good health

 

Those numbers sound fine. Consistancy between cylinders is the important thing to look for. A lot of compression gauges aren't super accurate to the actual PSI. I say buy it, keep up your maintenence and drive it another 80,000km

 

Did you hold the throttle open while you turned the engine over?

 

I have a 2000 s2k with 80,000kms. Its been misfiring so i decided to do a compression test and my numbers have been 155,155,155,155 would this be considered not good?

 

again, there are so many variables with it. Altitude, the guage, the technique, the throttle position.

If your cylinders are all the same, that's good. misfires are usually plugs or coils.

 

What compression tester did you use?

I recently purchased a cheap US General from Harbor Freight and it does not have a Schrader/check valve at the tip of the adapter hose that screws into the head, as a result I had additional volume inside the hose that the motor had to compress and got results similar to you. However, I did have 1 low cylinder (165psi compared to 180psi). I redid the compression test borrowing another compression tester which had a Schrader valve at the end of the adapter hose and got readings from 200-240 psi. Not all compression gauges are built equally, but your readings seems consistent across all cylinders so it seems fine. I suggest finding another compression tester to see if you get the same results.

 

I got the s2000. So happy with my new car!!