What do u think of my compression #'s

[MysticDan]

Did a compression check on my car to see how it sits before I start to throw some actual power at it. Test was done on a cold motor, all plugs pulled and charger on battery.

Driver Pass
Front 155 180
150 175
170 180
Rear 130 170

Should I worry about the 130 or will it last!!!

 

[Ex President]

You should be checking it when it's warm.... Cold #'s don't mean much.

 

[03Snake04]

i know what i think of your avatar :beer::beer::beer:

 

[Ray Lucca]

Re-check the compression when the motor is warm and check the plugs... My car dropped 60 RWHP and I had 7 cylinders between 175 and 180, and one front cylinder,# 5 at 130....Babied it for 6 months and replaced the motor. Just put 1500 break-in miles on the new one, we re-tune next week....

 

[MysticDan]

Does a warm motor vs cold motor make that much of a diff.

 

[SnakeBit]

Does a warm motor vs cold motor make that much of a diff.

Yes it does. You need everything expanded properly. Maybe on hypercrapola pistons it may not make much difference because they have very low thermal expansion, but on forged pistons, it must be up to temp for correct readings.

Also make sure the throttle is wide open when checking each cylinder.