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Engine Compression

Deactivate fuel injection system by removing main relay prior to compression test. With battery fully charged, engine at normal operating temperature, throttle fully open and engine at cranking speed, compression pressure should be as follows:

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio
325e & 528e 9.0:1
533i, 633CSi & 733i 8.8:1
Compression Pressure 142-156 psi (10-11 kg/cm2 )
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