[Guest]

What should the compression read on a NA Supra? Mine are between 170-175 and fall after cranking.

 

[RacerRT]

Standard compression is 186, minimum is 156.
Your just taking the highest the guage reads on each cylinder... so you should be fine.

 

[Guest]

Thanks. So, it doesn't matter if it falls rapidly?

 

[RacerRT]

Nope, it will fall, because you are losing cylinder pressure as you crank. Your just looking for the highest reading, and should only need to turn it over for 2-5 seconds per cylinder.