Compression Readings

Two questions,I recently carried out compression tests on my 500 and had the following "dry" results:
1:155
2:145
3:142
4:122

Then "wet":
1:276
2:215
3:196
4:181

What puzzles me is this, the manual says the compression ratio is 9.5 : 1
I thought this meant [9.5 * 14.7] lbs/inch squared,which would give a theoretical [well to me at least:blink: ]maximum of 139.75 lbs/inch squared!
I don't understand this, any help greatly appreciated.
Second, there seems to be a trend of reducing numbers from left[1] to right[4].Can anyone explain this please.
Regards from England:)

You are confusing volume with pressure for one.

For the techical description of what is happening, read www.chemtutor.com/gases.htm

And keep in mind (as the link will tell you), as a gas (air) is compressed, the temp increases, thus increasing the pressure.

Long story short, it's all described under the "Ideal Gas Law"

I tried to post the formula, but the formatting gets all messed up

Post edited by: steell, at: 2006/05/02 17:11

I'll look at that, thanks a lot.