GSR44

i just did a compression test on my 98 gsr (H/E, 50K miles) and got 165, 170, 170, 175. i've heard that gsr's should average about 200 across the board...are my compression numbers a bit low? what could be the problem? any help/advice would be appreciated...TIA.

sgT

Make sure that you did the test with the engine at operating temp and
that you held the throttle wide open.

GSRwBOOST

How often do you beat the **** out of it?

how many miles on the engine??

looks like worn rings from high mileage unless you beat the **** out of it...

the numbers look pretty close which is wht you want... so it looks good.. what mods are you looking at? FI??

BoM

Those are my numbers
avg each cylinder

#1 213.3
#2 225
#3 215
#4 230

and i beat on my car.......88k miles too

dustin

Yeah I don't think you did the test right. Also disconnect power to the ecu (backup fuse)... else the cylinders will get flooded with fuel and all the oil will wash away.

Dustin

GQ 05YellowEVO8

Mine are 220 across the 4 cylinders with the car partially warmed up with my intake cam at +5, exh +3

I supposedly have 11.8 compression on a stock GSR bottom end with a mugen headgasket and DPR stage 6 headwork.

Maybe when I set the cams to 0-0 and warm the car fully I'll get better numbers..

GSR44

right now i just have a dc 421 header w/ apexi dunk exhaust...i took my cai for the winter. the test was done when the engine was still a bit warm...i let it sit for an hour after i got home before i did the test. as for beating the **** out of it....hardly. i'm a victim of an exhibition of speed contest ticket, so i usually drive like an old lady, shifting around 3K. occasionaly, i take her up a bit high (6-8K) on freeway on-ramps, but thats about it. so far, i've gone to the track twice which were a couple of months apart. dustin: yes, the fuel injection fuse was taken out prior to testing.

edit: btw, would the fact that i'm pretty much due for a vavle adjustment have any impact on the numbers?


[Modified by GSR44, 8:38 PM 1/10/2002]

GSR44

ttt