compression psi to ratio: compression test results!
 

im not exactly sure that this is where this belongs but this is where its going...im wanting to figure out how to turn a compression test into a compression ratio. ive looked around on a few different sites but i havent came up with much nor do i know if its even possible...?

Re: compression psi to ratio
 

I don't think its possible. Maybe rough approximation, but not exact. If your compression is low on all your cylinders, is you compression ratio drop? No. There's too many variable for compression ratio.

Re: compression psi to ratio
 

ok well then will...a d15 with 9.5:1 compression have different numbers than an h22 of the same compression ratio when a compression test is ran?

Re: compression psi to ratio
 

mabey due to bore and stroke

Re: compression psi to ratio
 

ok cool i dont feel quite as dumb now. im not the only one that doesnt know. the reason i ask i have an h22 hatch and im wating to turbo it. supposedly something has been done to it the guy i got the motor got it from a guy that got it from a guy... its supposed to have really high compresson and when i took it to get it tuned it put down like 225 and dan said hes never seen an h22 put down that much power that was stock. im gonna go run a compression test probably tomorrow when i get off work. im just trying to figure out what is done to this thing without pulling the head...

Re: compression psi to ratio
 

Well obviously the lower the compression ratio the lower the compression of the motor and vice versa. If your compression ratio is 10:1 you will have a much higher psi reading on the gauge than if you had a motor with a 9:1 ratio. All you need to do is find what the service standards are for a compression test on the H22 and see where your numbers sit at. ;)

Re: compression psi to ratio
 

maybe dew to leaks !! more wear different engien more blow by?

Re: compression psi to ratio
 

7.0 is like 141, 8.0 is 162, 9.0 183... and so on. thats just what my gauge says

Re: compression psi to ratio
 

huh? i said it makes more power not less?


well yes i understand that more psi means higher compression ratio. i would just like to know what the compression ratio is on this stupid thing to figure out whats been done to this thing. oh well thats cool i just didnt know if theres a formula or something. thanks for the info though!

Re: compression psi to ratio
 

lol