Nissan 1990 240sx. (S13) w/ SR20DET Red top

[Mr_S13®]

Okay, im with you guys. But IF, keyword IF, he tested the motor before install; then it was more than likely with a jumpbox. In which case you would not have the engine at operating temperature which could explain the low compression numbers. Heat expands things, everyone knows this. Including your piston rings to seal the cylinders. So cold motor= low compression. A better way to tell would be to go look at it, let it get to temp, then test it yourself.......IMHO

[HiPSI]

Okay, im with you guys. But IF, keyword IF, he tested the motor before install; then it was more than likely with a jumpbox. In which case you would not have the engine at operating temperature which could explain the low compression numbers. Heat expands things, everyone knows this. Including your piston rings to seal the cylinders. So cold motor= low compression. A better way to tell would be to go look at it, let it get to temp, then test it yourself.......IMHO

i tested my redtop cold when i had it and it hit 145psi on every cylinder. i'm not trying to shit on his thread but i know the proper specs on these motors and the shit he's quoting is total bunk. i have a nissan FSM sitting in front of me where i got my specs from, not some dealership taking a wild guess on the phone .