I have read a LOT of posts on compression on HT so I did my own and I got 180-180-170-175. The thing is I don't know if its actually any good since almost all the posts are for modded engines. Mine is stock 97 H22A4
The only thing I forgot was to do the wot while tuning the ignition. Does that actually change anything? Up compression or lower?

Thanks for you "quality" feedback

 

WOT while tuning the ignition will give you higher numbers. Those numbers look fine for a OEM engine.

 

the rule of thumb to know whether its good or not is if the difference between the lowest and highest number is less than 10% then your good.

 

Yeah but what if I would have got 150-150-140-145 ???
Then wouldn't have ben good either. Most of the posts give around 200-250.... so I was wondering why I was getting 180-170

 

180 to 195 is normal for OEM H22a4, and you porb. would get 190ish if you had WOT during your test. 200-250 is what you get with higher compression ratio than 10:1

If you are down at 150 that's too low.

 

its unlikely that all cylinders would read that low simultaneously.

 

mine at 127k is 210 accross.. only mod is intake.

 

Yeah but is it a H22A4? did you do it on wot? If it is then mine seems a little low....
But 577HondaPrelude says its normal, so why the hell is every one getting over 200 on average?
mileage = 105k


Modified by jardolei at 3:17 PM 6/6/2007

 

How do you do a compresion test ?

 

nvm got it

 

depends on how babied the motor was too. If the seals are solid the compression is going to hold well and thus be higher

 

Well...for those guys that have high numbers...take into consideration that they might have significant amounts of carbon buildup in the combustion chamber. I think its possible. The oem specs for compression from the Manual are from 135- 180 psi or so. And if i remember each cylinder must be within 21 or 28 psi of eachother. just my 2cents