The RX-7 Im buying the car from sent me this email. We did not have a clue what all the numbers mean or what. Anyway, what do all these numbers refer to anyway?

QUOTE FROM EMAIL
"Hey whats up, here are the numbers from the car. The
"compression" is 7-3,7-2, and 7-3. The other numbers
(they said the front and rear rotors are vey close
together in compression #'s) are 181-283-381-482. The
"psi" is 93 and the "diff." is up to 21."

 

Does anyone know what those numbers mean? I thought compression was like 120ish or something?

 

I have no idea what the second set of numbers mean but the first set looks good, depending on the exact testing conditions. You can get compression numbers in kg/cm^2 - they should be about 7 or above, or in psi - they should be 100 or above. More importantly is that the numbers are very close together and consistent from seal to seal and from rotor to rotor.

 

a real strong motor would show in the 8's or up. Like said earlier I also dont know what the 2nd set of #'s is. 7 is ok but it does show that there is some wear.

Maybe the 7's are for one rotor and the 2,3,2 is for the 2nd rotor showing that its a blown motor. That would be about right for a blow motor.

Those psi #'s and all that dont make any sense, I have no idea what that is.

Maybe the test was done wrong. Where was it done at, you could probably call and ask about it.

STEPHEN

 

So does that mean that the motor is blown? Im lost as hell here? Also, the work was done at Pettit.

 

no, from looking at teh first set of numbers the compression looks pretty good, cause you want a compression that is above 7's and numbers that are close together, the second set si

 

So, noone knows what the second set means?

 

call Pettit.