good compression?
 

yesterday i measured 91 and 92 psi (front and back) on my rebuild with 450 miles. am I on the right track?

Tell us about the rebuild. Who did it? Based on other threads I've read, it sounds reasonable for 450 miles. You might expect a little higher numbers, maybe 94 after 1,000 miles.

it was done by rx7 specialties in calgary. new housings, other than that it was a stock rebuild. any other input?

With new housings , that is exceedingly low.

I bet he didn't use new housings... mine is in the 90's psi range... a rebuild with 3,000 miles using older housings. New housings should put you in the 110 to 120 psi range.

Josh

Still great numbers no matter what.

Mine at 500 miles was around 75-80psi(shitty ass Jspec cores!!!).

If you paid under $1600-2000 I doubt you got new housings.

How did you do the compression test? What were the readings on the individual faces of the rotors? What was the engine RPM when you took the readings? All these factors have a huge bearing on evaluating compression readings.

i just did a comp test last week and i got 85 on the front and 90 on the rear in my new motor. my motor was built by keven landers and it has a port on it.

the test was done with the engine warm. cranked about 5 times. I just rememberd I didnt hold the throttle open so that might have hindered it a bit. was just usin a 20 dollar wal mark tester. and yeah it does have new housings.

Well, I've always understood 80's/90's to be on your way to a rebuild soon... just saying. New housings should get you higher numbers than 90 psi.

Josh

I have seen motors run fine on 80psi. Of course those were T2's. However you must remember that 5,6,7 psi difference from what you are wanting to show on that tester is not a big deal. If your showing 100+ with new housings thats great! But if you are getting between 90-100 with used housings you are doing just as well.

All in all, 5-10 psi is not a matter to freak out and think that your motor was not built right.

There's your answer. Retest with the throttle wide open, then let us know what you got.

bingo!

drag it behind a truck at 50 and then do your test, that'll give ya the #'s you want.