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Home >> Subaru >> 1989 >> XT 1.8 5 >> Repair and Diagnosis >> Engine Performance >> Adjustments - 4-CYL >> Engine Mechanical >> Engine Compression
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Engine Compression

Check compression pressure with engine at normal operating temperature, all spark plugs removed, throttle valves wide open and at specified cranking speed (350 RPM).

4-CYLINDER COMPRESSION SPECIFICATIONS

Item Specification
Compression Ratio
Turbo 7.7:1
Non-Turbo 9.5:1
Normal Compression Pressure
Turbo 145 psi (10.2 kg/cm2 )
Non-Turbo 168 psi (11.8 kg/cm2 )
Minimum Compression Pressure
Turbo 117 psi (8.2 kg/cm2 )
Non-Turbo 139 psi (9.8 kg/cm2 )
Maximum Variation Between Cylinders 28 psi (2.0 kg/cm2 )