Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1991 >> RX7 2RTR-1308cc 1.3L MFI >> Repair and Diagnosis >> Specifications >> Pressure, Vacuum and Temperature Specifications >> Compression Check
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Compression Check



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
pro multis · About Operation CHARM