Im interested in buying a 98' GSR motor w/ 63k miles. The seller told me the compression test gave back these numbers.

cyl#1 190
cyl#2 193
cyl#3 198
cyl#4 191

Should i be worried about these numbers??

TIA

 

numbers seem good to me...

 

As long as your within +/-10psi from highest to lowest your fine.

 

what if I have
0
0
0
0

?

 

Those seem kinda low compared to my #'s

250 246 245 245

97 gsr with 69k miles

 

They seem kinda low, but not too bad

 

my boys 97 GSR has 93000 miles...hydrolocked... and still put out 220 psi all across the board...so those numbers do seem kind of low

 

So is it something to be worried about?

 

with lower compression numbers that means that either the seals are going such as..piston rings or valve seals...or B) compression test was done wrong and he didnt open the throttle all the way like your supposed to when doing a compression test. was the motor boosted at one point? or perhaps was spraying on the motor? if so what size shot/how many lbs of boost and for how many miles. just my .02 cents

 

what is normal compression for all 4 cylinders. i have a 96 gsr with 99,980 miles and am wanting to do a comp test.

 

The numbers seem fine. If you are worried about it, have him do a cylinder leakdown test.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integra707 &raquo;</TD></TR><TR><TD CLASS="quote">The numbers seem fine. If you are worried about it, have him do a cylinder leakdown test.</TD></TR></TABLE>

he did one, and also a visual examination of the head. i started this thread cuz those numbers seem kinda low.

 

My haynes manual says 270 is normal for a GSR motor. You are allowed 28 psi of variation between cylinders but you want them to be as close as possible to each-other. Minimum psi allowable is 135

The above numbers I posted were after a hydrolock too, I got very lucky

 

You have to also keep in mind, that some compression testers just have different readings. Thats the long and short of it. Thats why the try to stay away from, oh this number is good, and this is bad, is because people get different readings based on equipement. (Assuming the test is done correctly.) TYPICALLY as long as your within +/-10psi, your fine.

 

EGEESIX

did you test it while the engine is warm with the throttle fully open?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EGEESIX &raquo;</TD></TR><TR><TD CLASS="quote">Im interested in buying a 98' GSR motor w/ 63k miles. The seller told me the compression test gave back these numbers.</TD></TR></TABLE>

I didnt do it

 

those looks normal....

 

thanks for the help guys (gals)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsr-2nr &raquo;</TD></TR><TR><TD CLASS="quote">what is normal compression for all 4 cylinders. i have a 96 gsr with 99,980 miles and am wanting to do a comp test.</TD></TR></TABLE>
I think the norm is 240.... but i may be wrong

 

my haynes book says 270 is stock PSI.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTECorona &raquo;</TD></TR><TR><TD CLASS="quote">my haynes book says 270 is stock PSI. </TD></TR></TABLE>

haynes.....lol

only good for a foot rest.....

 

270psi is correct.

-Will

 

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

haynes.....lol

only good for a foot rest.....</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integra707 &raquo;</TD></TR><TR><TD CLASS="quote">270psi is correct.

-Will</TD></TR></TABLE>

 

Gotta get the Helms factory manual The Haynes and Chilton are good for newbies. There are a lot of good troubleshooting and maintenance procedure sections that are explained more thoroughly than the Helms. I have all three.

 

I bought the haynes strictly for torque specs, a helms is on the way