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Home >> Subaru >> 1990 >> XT 1.8 5 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments - 4-CYL >> Engine Mechanical >> Engine Compression

Engine Compression

Check engine compression with engine at normal operating temperature at 350 RPM, all spark plugs removed and throttle valves wide open. All fuel injector harness connectors should be disconnected.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio
1.8L Turbo 7.7:1
1.8L Non-Turbo 9.5:1
2.2L 9.5:1
Compression Pressure
1.8L Turbo 117-145 psi (8.2-10.2 kg/cm2 )
1.8L Non-Turbo 139-168 psi (9.8-11.8 kg/cm2 )
2.2L 128-185 psi (9.0-13.0 kg/cm2 )
Maximum Variation Between Cylinders 28 psi (2.0 kg/cm2 )