when compression testing a 12a what should the psi be?? i called one of those importer places and they told me they had a 12a with 225psi i thought it was suspoed to be around 95psi!?!?!!?

 

Yeah, 225 psi is way too high.
95 psi is a bit low, though.

 

is too high bad??

 

225? yea ok, hey I got a bridge I need to sell, wanna buy it?

Stock iron apex seals 105-150 hot

90 Min, no more than 20 psi difference between chambers, and It will not run below 70psi.

 

in my hayes it says 85 psi @250 rpm what the hell is that???

 

maybe it was 85 min. I have CRS

 

actually it said maximum it seemed like a misprint to me

 

Knowing Hayes, the author simply held his hand in front of the sparkplug hole and wrote down, "feels like 85 psi" and got lucky.

Mitchell manual for '83 clearly states:
Minimum 86psi
Maximum Variation 21psi

For '84 the Minimum drops to 85psi. Why? Who knows, maybe a misprint.

 

well hey at leat they got the variation right they said no more then 21psi maybe 85 waas susposed to be minimum not maximum

 

So if I had 85 PSI on one rotor and 95 on the other it would mean my engine needs rebuilding? There seems to be so many different compression figures on this forum!!!

 

No, they dont wanna see more than 20psi diff between chambers of the same rotor. That means you have a bad seal, usually apex.

Im telling you its 105-150, thats straight from Mazda.

And the will not run below 70 is from personal experience.