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Home >> Honda >> 1991 >> Prelude 2.0 Si, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Compression
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Mechanical Inspection: Compression

  1. Check engine mechanical condition using a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
  2. Check compression pressure with engine at normal operating temperature, all spark plugs removed, throttle valves wide open and at specified cranking speed. Crank engine at least 6 revolutions to determine engine compression. Compression reading should be as specified in ENGINE COMPRESSION  table.
    CAUTION: DO NOT  use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system.
    ENGINE COMPRESSION (1)

    Model Standard psi (kg/cm2 ) Minimum psi (kg/cm2 ) Minimum RPM
    Prelude 178 (12.5) 135 (9.5) 250
    (1) Maximum variation between cylinders is 28 psi (2.0 kg/cm2 ).
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