Cylinders:

1: 152 2: 150 3: 150 4: 150

Are these numbers low for my LS?? I'm worried because i'm going to be boosting soon, and didn't want to **** anything up.

 

Those numbers are fine.

They are slightly lower than I've seen from some LS's, but they are consistent, and it this case that is more important.

 

my 97 ls engine are 200-190

 

Cool, I wasn't too sure what would be too low. If you have high milage on your car, there might be carbon deposits that up the compression naturally

 

are higher numbers better or lowers numbers better?

 

Did you have the gas pedel depressed while cranking?

 

Those are good numbers AJ -- ready for boost

 

Stock LS compression: 200
Minimum:135

 

yes! that means mine is healthy! what's the gsr's and itr's

 

my 94 LS with 118k put down 195psi across the board

 

^^^ a must. if you do not, you will get low compression results.

 

i got 160k+ miles and my comp. is 215.

 

then that means too much compression, going to blow up

any engine work?

 

my 96 LS with 118000 miles had 180-190 all across

 

97 ls with 112000 put 195 across all four cylinders....

 

i believe my comp is normal for GSR's.

 

how do u do a compression test? or post me a link of a thread telling me how to
... thank you

 

Yeah I think those numbers are fine. There all really close which is what really matters. Sometimes the gauges are off. I tested my old supra with 2 brand new gauges and the numbers were off by like 30psi/per cylinder between the two gauges. Just worry mainly about the difference between the cylinders, unless you have other reasons to assume your engine isn't healthy.

 

those numbers are fine but remember that it makes a big difference if the motor was warmed up or not.

 

It should also make a difference what gauge you used. It's only really fair to compare the actual pressure numbers if different engines were measured with the same gauge. The internal volume of the gauge makes a difference.

If somebody told you that your engine had 220psi numbers when it was new, now its only 185psi, you'd probably worry. But that's only fair if they were measured with the same gauge.

 

What about if my battery was dying throughout the test. I had to charge my battery through my friends car, while we were doing it.

 

Yeah, I guess that would influence it, too. If it cranked at the same rpm for all 4 cylinders, that's good. If it cranked slow for a couple cylinders, then you got the jumper cables for the remaining cylinders, that's not good. It's important to do them all the same way. If it cranked slower than normal, it would explain why your numbers are lower than other people's numbers.