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Home >> Mazda >> 1991 >> RX7 2RTR-1308cc 1.3L MFI >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Compression Check >> Specifications
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Compression Check: Specifications



Compression

Fully depress the accelerator pedal and crank the engine for 5 to 10 seconds.
Record the compression of the three combustion chambers and cranking speed.

Compression:
589 kPa (6.0 kgf/cm2, 85 psi)-250 rpm.
Differential limit between chambers:
147 kPa (1.5 kgf/cm2, 21 psi)-250 rpm.





Cranking speed compensation
Compensate the compression according to the cranking speed.





Altitude compensation
Compensate the compression according to the altitude.

For detailed testing procedure see Compression Test. Testing and Inspection
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