2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Compression question

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Old Feb 28, 2006 | 04:58 AM
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Compression question


Does this car have 3 rotors???If not can someone explain how to read this compression test and what are the best numbers for a FCs T2 engine.
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Old Feb 28, 2006 | 05:01 AM
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im sure that shows the compression for the 3 different faces of the rotor.
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Old Feb 28, 2006 | 05:50 AM
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Uh huh. Good numbers, too.
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Old Feb 28, 2006 | 07:16 AM
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Those are the readings from the 3 faces of one rotor, and those numbers indicate that the combustion chamber tested is virtually new. Those are very good compression readings, just hope that the other rotor is as good.
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Old Feb 28, 2006 | 11:59 AM
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I wish mine would have been like that, I got 6.5-6.9 on both rotors.
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Old Feb 28, 2006 | 06:00 PM
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wuts the best compression possible? How much does a comp test usually go for. Also is it really hard for Average condition T2s to pass CA emissions?
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Old Feb 28, 2006 | 07:54 PM
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damn those are really good compression numbers man, the highest is 9, man i hit 6.7 on the front rotor and on the rear 0-0-4.7. I'm just curious how many miles are on that motor?
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Old Feb 28, 2006 | 08:15 PM
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Download or buy the FSM and it'll answer your questions.
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Old Feb 28, 2006 | 10:06 PM
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Originally Posted by tjeter
damn those are really good compression numbers man, the highest is 9, man i hit 6.7 on the front rotor and on the rear 0-0-4.7. I'm just curious how many miles are on that motor?
doesnt 0-0-4.7 mean you have a blown seal or somthing?
and to test both rotors you put the compression tester in the front and back lower spark plug chambers right?
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Old Mar 1, 2006 | 12:13 AM
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seriously tho say it was a rebuilt t2 motor..would it have problems with smog or just be splitting hairs?
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Old Mar 1, 2006 | 06:51 AM
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Originally Posted by FC3S dream
seriously tho say it was a rebuilt t2 motor..would it have problems with smog or just be splitting hairs?
Is it now, or will it be, connected to an exhaust system with a catalytic converter? Are the OEM emission-control components still in the car and operational? Are you running the OEM computer? If so, you should be OK.
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Old Mar 2, 2006 | 07:01 PM
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how much does a compression test and full tune-up go for on average? Also is there any Rotary Performance shops in the Nor Cal area??
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Old Mar 2, 2006 | 08:24 PM
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Originally Posted by FC3S dream
how much does a compression test and full tune-up go for on average? Also is there any Rotary Performance shops in the Nor Cal area??
hmm well everyone in nor cal bay area knows about ricks rotary in pleasanton haven't been there myself, but i might stop by in the future
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Old Mar 2, 2006 | 10:17 PM
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Thats a bit strange.

The faceplate says the unit of measure is x10 KPA.
kPa x 0.14504 = psi

So 90 x 0.14504 = 13.0536 PSI.

That alone confused me.

Another consideration is a genuine comp tester reads in kg/cm2 (bar). So it would be misleading to compare numbers off this meter with numbers off a genuine meter.
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Old Mar 3, 2006 | 01:25 AM
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Originally Posted by KillerRx4
Thats a bit strange.

The faceplate says the unit of measure is x10 KPA.
kPa x 0.14504 = psi

So 90 x 0.14504 = 13.0536 PSI.

That alone confused me.

Another consideration is a genuine comp tester reads in kg/cm2 (bar). So it would be misleading to compare numbers off this meter with numbers off a genuine meter.

Move the decimal point to the right. 1kPa = ~ 14.5 psi.
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