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Engine Compression

Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.

COMPRESSION SPECIFICATIONS

Application (1) Specification
Compression Ratio
3.0L (VIN H)
Diamante 10.0:1
Stealth 8.9:1
3.0L (VIN J) 10.0:1
3.0L (VIN K) 8.0:1
Compression Pressure
3.0L (VIN H)
Diamante 196 psi (13.8 kg/cm2 )
Except Diamante 171 psi (12.0 kg/cm2 )
3.0L (VIN J) 185 psi (13.0 kg/cm2 )
3.0L (VIN K) 156 psi (10.9 kg/cm2 )
Maximum Variation Between Cylinders 14 psi (1.0 kg/cm2 )
(1) See ENGINE/VIN ID article for VIN information.