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Home >> BMW >> 1978 >> 320i Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures - 4-Cylinder >> Engine Compression
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Engine Compression

Check compression pressure with battery fully charged, engine at normal operating temperature, throttle fully open, and engine at cranking speed.

COMPRESSION PRESSURE SPECIFICATIONS

Condition Pressure
Good Above 149 psi (10.5 kg/cm2 )
Normal 135-149 psi (9.5-10.5 kg/cm2 )
Poor Below 128 psi (9.0 kg/cm2 )
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