RX7Club.com - Mazda RX7 Forum - compression test??

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joep	Jan 20, 2003 04:09 PM

compression test??

heres the scoop. I took out my spark plug and did a compression test. Both front and rear tested 90 lb/in^2. I think this is low compression. Im right arent i? whats a new motor run??

joep	Jan 20, 2003 04:41 PM

bump

niner

Jan 20, 2003 04:42 PM

thats a little on the low side, but the engine should still run. the fsm says 85 is minumum
a rebuild starts at about $1700

so it was 3 even bumps at ~90 each on each rotor?

joep	Jan 20, 2003 04:51 PM

well it was kinda wierd. no matter what. The first pump on the first rotor was 60 then the next went to 90. It stayed at a constant 90. The rear went to 60-90 and the bounced around like 92-67-90. You think if my 6th ports are wired open that would hurt my compression?

joep	Jan 20, 2003 04:52 PM

and to put it in perspective?? whats a rebuild start out at?? how long does it take normally to go from 90-85. Worth doing a rebuild right now??

joep	Jan 20, 2003 05:59 PM

bump

Spraintz

Jan 20, 2003 06:20 PM

you really need to find out what each rotor faces comp. is.

mine has 75psi on each rotor face and on each rotor. and mine still runs pretty well. battling a fuel issue right now but when fuel is ok it still runs good.

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