I did a compression test on my motor and the numbers were about 200 through all of the cylinders but I only turned it over twice on each one. Some people say that you can calculate the motors compression through that and they say that is a stock h22's compression not with the type s pistons. But are they right because I've read some of the ways to do it and it says your supposed to turn it over almost ten times and at least 6. Thanks

 

You crank your engine over til it acheives it's highest reading in each cylinder. Of all the engine's I've tested, none have reached it's peak compression in just two revolution, so go back and try it again.

 

If you do a compression test i dont think you need to calculate anything else to see how much compression you got, I am sure 4 times is good enough or 5 if you want to, since it is a 4 stroke motor anything more than 4 cranks wouldnt make any more difference.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by builtprelude &raquo;</TD></TR><TR><TD CLASS="quote">I did a compression test on my motor and the numbers were about 200 through all of the cylinders but I only turned it over twice on each one. Some people say that you can calculate the motors compression through that and they say that is a stock h22's compression not with the type s pistons. But are they right because I've read some of the ways to do it and it says your supposed to turn it over almost ten times and at least 6. Thanks</TD></TR></TABLE>

I think your confusing comression RATIO with the compression TEST that you perform on each cylinder to see if your rings are wearing down.

There is a formula for calculating compression RATIO, that has to do with specs on crank liter size, piston dome height and wrist pin location, combustion chamber size, cylinder width, etc. This formula once figured out will give you the compression ratio such as 10.1, 11.1, etc. Its not the same as doing a compression TEST though (although I could be slightly wrong).

Compression TESTing lets you know how well your piston rings are holding up, mainly. It's not really a way to find out what your compression ratio is, although there might be a way if your good with math

I hope I read your question and answered it right..lol..

 

well some of the people in the prelude forum were saying that they have seen motors with type s pistons in them having compression of about 230 in each cylinder and that made me wonder

 

when i did a compression test on my motor it was 245-247 across on an H22...i crank 7 times though....

 

people do 4 or 5 but it usually takes about 7 cranks ( there is a point it just stops compressing but the motors I have seen go past 300 psi ( which if not using the right gauge will break them) and thats doem high compression hehe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Katman &raquo;</TD></TR><TR><TD CLASS="quote">

I think your confusing comression RATIO with the compression TEST that you perform on each cylinder to see if your rings are wearing down.

There is a formula for calculating compression RATIO, that has to do with specs on crank liter size, piston dome height and wrist pin location, combustion chamber size, cylinder width, etc. This formula once figured out will give you the compression ratio such as 10.1, 11.1, etc. Its not the same as doing a compression TEST though (although I could be slightly wrong).

Compression TESTing lets you know how well your piston rings are holding up, mainly. It's not really a way to find out what your compression ratio is, although there might be a way if your good with math

I hope I read your question and answered it right..lol..
</TD></TR></TABLE>Yeah one is "static compression" and the other is "dynamic compression."