testing compression

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06-18-02, 07:37 PM

neevosh

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testing compression

What's the correct procedure for testing compression? I followed the instructions in the manual, but I'm not sure I'm doing it right.I screwed the tester into the trailing plug and cranked the engine. It jumped up to 45psi, 70psi, then 100, moved around a little but stayed around there after cranking it a few more time. About same on the other rotor but it only hit 90psi.

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06-19-02, 12:39 AM

neevosh

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Nevermind, I found it.

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06-19-02, 06:06 AM

Dont_Be_A_Rikki

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you should get 3 even pulses with a standard comp. check i usally see 90-90-90 on most but it can go down further I suppose but they say as long as it is 3 even pulse's you are o.k

-Ryan

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06-19-02, 06:32 AM

jspecracer7

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Quote:

Originally posted by neevosh
Nevermind, I found it.

so post the thread...I need to do this too

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06-19-02, 02:00 PM

c00lduke

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like neevosh mine goes like 30-30-30 and stop at 90 no matter how much more i crank it, but that was on a cold engine.

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06-19-02, 03:16 PM

Dont_Be_A_Rikki

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really as long as you get 3 even pulses that is all that matters it can very but no more that say 12-15 psi max but to me that is a little to much i would (IMO) go with 7-10 psi but that is just me.
also get a real mazda tester and it comes out on a cool (earthquake type) pc of paper