What are some good compression test numbers for the B18C? and the B18C1? Does compression have a pretty good corrilation the the kinda HP numbers you will see if your not dealing with forced induction?

 

I believe your looking for around 170-200 for a stock B18C1 (I'm not sure what your asking with a B18C, it's the same engine). The higher the compression, esentially the higher the power it will make. A motor with 190 across the board will not make a signifigant or probably even noticeable difference from 185. Basically with a comrpession test, you just want to make sure all 4 cylinder are very close to each other (+/- 10%). If one is really low, it could have a gouged cylinder wall or damanged ring (or other things). Think your body temp, if it's around 98.6, your fine. If it's something funky, there's something wrong. Seeya.

 

Yes like Andy said you are looking for numbers in the range of 170-200. 180psi is right around what you are looking for on a GSR with stock pistons in it. 190psi would be high, 200psi is not likely to happen on a motor that has been driven even once, and 170psi would be a tad low.

BUT

Your psi in a cylinder is not so important. You are more looking for consitant compression like Andy said rather than Really good compression. You could have 200-200-200-175, well all 4 cylinders are within the specs we gave you, in fact 3 of them have near perfect compression, BUT the last one (175psi) has quite a big jump down from the other 3, that is a sign of a problem. So like Andy said all 4 cylinders should not only be within 170-200psi but should also all be within 10% of eachother.