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Engine Mechanical: Compression

ENGINE COMPRESSION SPECIFICATIONS

Engine Specification
  4.0L
    Compression Ratio 8.8:1
    Max. Variation Between Cylinders 30 psi (206 kPa)
    Pressure Range 120 to 150 psi (827 to 1, 034 kPa)
  4.7L (1)
    Compression Ratio (Except HO Engine) 9.0:1
    Compression Ratio (HO Engine) 9.7:1
(1) Pressure specifications are not available from manufacturer.