I have an 07 (DBW) w/46k and did not hold the gas pedal down....

Numbers: 260 250 250 250

https://www.s2ki.com/s2000/topic/956...st-track-pics/

 

Hey guys i just did compression test on all cylinder about 5hour ago, here are the numbers


1st time doing this so i did it twice just to make sure i do the right thing (Cold start, fuel pump fuse not taken out, cranked 6-7 times 1sec interval)


.......

And so after 3 hour, i decided to test it again because im not very satisfied with the first results, this time ive got 245 all across. (Warm start, fuel pump fuse out and also i cranked it continuously up to 4secs)

I really dont know why it gave me higher and consistent number this time. Maybe being the fuse is out, warm and cranking continuously...

But im happy with the results...

 

I've seen unusually high numbers due to excessive carbon build up. My suggestion is clean what you can, put another 500-1000 hard miles on it, and test again. If you are using a cheap gauge (I got a professional grade kit for ~$70 shipped from Amazon) it could also be a factor but that is a small probability.

 

Hello all,

I'm getting a car PPI inspection done at a Honda dealership in Denver and the results for the Compression test were 185psi across all cylinders. They are saying this is well within range and the car runs/feels fine during the inspection and overall condition of the car is excellent. Should I be concerned or is altitude a possible cause for the low readings?

Thanks

 

Altitude definitely impacts the compression numbers

 

The relative air density in Denver is 82% of sea level. I'd expect compression numbers to scale accordingly. So 185 in Denver is worth 225.6 at sea level, according to my calculator.

 

Ummmm what about doing it wet???

 

This is a pretty old thread... but I guess it's a topic that will keep living forever. A wet compression test can, at times, help boost compression numbers because the oil will act as a plug for a leak point in the cylinder, so it can hold a higher pressure.
The relative air density in Denver is 82% of sea level. I'd expect compression numbers to scale accordingly. So 185 in Denver is worth 225.6 at sea level, according to my calculator.
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Even though this response was from a long time ago I felt like I need to comment. In a compression test, the ambient air pressure should not matter. The compression is within the cylinder. It's holding in a high pressure from cranking over and has a point that it can't exceed, based on mechanical (and chemical, I guess, since oil plays a role on the cylinder walls) limits. It's sucking in air from the atmosphere, but it will just keep sucking until it can't (wow, that sounds dirty lol).

 

Does 220 / 215 / 195 / 220 sound good for a 2002 with 57k miles? I'm looking to finalize a deal with the owner.

 

My test results (05 stock 57k)

1-125
2-150
3-150
4-180

Going to have the valves adjusted, I'll post the results (#) after the adjustment.