Ok when I bought my 87 rx7, the dealership tested compression for free and they said it was 7.5 on both rotors. That is with a mazda tester. I recently read that mid 7's to low 8's with a mazda digital tester is like 105-110 is this true??

 

Good damn question. I would like to know as well the relation between mazdas tester and PSI #'s from a standard guage.

 

Yeah... Cause I bought my RX7 and the guy did compression at the dealers and he told me it was 7.5 on both rotors. Someone told me that was **** and I should be in the 100's for a healthy FC....Now Im just really worried I got ripped of with the engine in my car... But maybe its compression with the mazda tester.. Im so confused man.. LOL

 

Do you currently Drive an RX-7? If so what year? and how many miles?

 

Ok when I bought my 87 rx7, the dealership tested compression for free and they said it was 7.5 on both rotors. That is with a mazda tester. I recently read that mid 7's to low 8's with a mazda digital tester is like 105-110 is this true??

 

If the mazda tester is read in BARs then that could be true. Hmm someone have the conversion from BARs to psi?

 

compression is equivelant to 108 psi conversion factor is 1 bar=14.5037788 psi

 

ok i found the answer each bar is 14.5

 

Threads merged, please only start one thread on a subject

 

7.5 bar is 109~ish lbs.

 

So does the mazda tester measure in bars? are we certain on this?

 

The Mazda tester reads in kg/cm2. The conversion to psi is 1 kg/cm2 = 14.22334 psi. So the original 7.5 would equal about 106 psi.

 

I didn't know if it was in bars just saying that would sound right. Thanks C. Ludwig for clearing it up. Those crazy japanese testers.