midwestjunk

iTrader: (2)

i been sprayin my ls1 motor for a few years and decided to do a compression test to see how it has held up. the car is a LS1 with texas-speed stage 2.5 5.3 heads and a MS3 cam. stock 80,000 mile bottom end. the motor was cold. pulled all the plugs and checked each cylinder one by one. this is what i got.


#1 185
#2 180
#3 210
#4 180
#5 185
#6 185
#7 200
#8 190


is this normal? how does it compare to stock? why is one cyl 210 and one is as low as 180?

ZeeOSix

There will always be a spread between the lowest and highest cylinder ... I would say 30 psi isn't that bad for what the motor has been through. If you had a really bad cylinder you'd see a lot more than a 30 psi difference across them all. IMO, nothing to really worry about.

Did you do them in the order you show above? If the battery was getting a little low near the end of the testing, it's possible the last few cylinders that were tested might show a few psi less.

SOMbitch

iTrader: (8)

Looks really good especially on a cold motor.....

salemetro

iTrader: (5)

Yeah...and 2 years of sprayin' it??? Not bad at all! Definitely nothing to worry about. You could always do a leakdown test, if you're uber-concerned.

z99ls1

iTrader: (12)

Makes me want a shot of nitrous. Do you run a dry or wet shot? What kit?

Black 99 Bird

iTrader: (31)

Yeah, no kiddin!

midwestjunk

iTrader: (2)

dry 150 shot. nitrous outlet kit. 2 money races have been on 200 shot. its on a spray tune so it runs a bit fat crusing around but on spray its perfect. the car wouldnt add enough fuel by itself and it was very lean. had to permanently add more fuel through out the RPM range. 10.60 on a 150shot spinning. i was hoping for 10.0's on 200 when my suspension is sorted out. its just really difficult with the 6-speed.

midwestjunk

iTrader: (2)

what are the normal numbers for a stock engine?