bambooi

iTrader: (6)

What would you think if you were about to buy a built evo and you did a compression test on it and it resulted in about 135 psi in 3 cylinders and 125 in the cylinder near the timing belt? I know this is within the 10 percent variance. The miles on the build were about 4k. I didn't think to add oil in the cylinder to see if it was the rings.

barneyb

Having a cylinder 10 psi lower than the rest wouldn't bother me much (I'd prefer they all be the same but one low is almost normal) but 135 on the other three seems low for an engine with only 4K on it.

boosted91t

iTrader: (65)

I have seen 135psi on healthy engines - monster cams and lower compression pistons Don't sweat the 10psi difference. Run the car hard and enjoy it

batty200

iTrader: (3)

Was it fully warmed up? Forged piston Motors need to be at operating temp. Also find out what compression ratio because 135 is close service limit for old 7.8:1 4G63 Motors.

joseph143

iTrader: (8)

did you attempt this with you battery not on a charger? most people dont think about it and when their last cylinder comes up weak they freak out... when in reality the start didn't get enough juice to crank the motor quite right...