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#1
07-31-2004, 04:01 AM
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compression numbers
Is 98 psi decent compression for an s4 turbo motor?
What are the appropriate numbers?
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BAH!, went to change my sig and forgot what I was supposed to put here. . . 
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#3
08-01-2004, 10:47 PM
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Re: compression numbers
isn't it supposed to be like 120 or something? I don't know for sure but for some reason that number comes to mind
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1989 RX-7 TII --- Just got rebuilt and street ported RB 3" dual exhaust, BNR stage 1 modified factory turbo, FCD, S-AFC II, 720cc secondaries, Aftermarket Turbo inlet duct w/K&N, Hawk HP+ pads HKS Blow-Off Valve, Stainless brake and clutch lines
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#4
08-03-2004, 12:49 AM
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Re: compression numbers
compression numbers also go down if the motor has been sitting for awhile or JUST been rebuilt.
its always a chance buying an unknown motor.
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-1987 Mazda FC3S TII - dynoed 316rwhp 06.28.04 S5/S6 SP motor w/ HKA T04R @ 14psi CP Racing 4point Roll Bar Cusco ZeroII Coilovers SSR Watanbes RS-8 17x8F:17x9R - 1993 Mazda FD3S Competition Yellow Mica R1 - 1991 Mitsubishi Galant VR4 - daily grind JDM EVO RS motor w/ EVOIII 16G turbo
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#6
08-03-2004, 09:04 AM
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Re: compression numbers
what's important is to have even bounces (assuming you used a conventional tester with valve button depressed) ... Now, the psi reading you see when it's bouncing is not the actual compression a Mazda tester would get ... it's really low-balling the actual compression for each chamber.
To get a reading that's somewhat accurate and assuming the bounces are even, you now need to get an "accumulated" psi reading on the dial (to do this, you don't depress the valve button on the gauge ... same as for piston engine procedure) ... that's your compression. Don't get too upset about you are getting because there a lot of factors involved: how hot the engine is, how thick the oil is, how fast the starter turns, etc. see for more info: http://www.geocities.com/huguesdc1/faqcompression.html hugues-
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The MAZDA RX-7 86-88 Technical Page
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