Compression statique, dynamique, fichier pdf des procédures et spécifications des tests (anglais)

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Compression Dynamics Federal-Mogul Document #1524

Static Compression Testing
Start with a normal static compression test, all spark plugs removed – spark and fuel disabled -
throttle fully open – engine warm. Record reading by cylinder (after cranking 4-5 engine
revolutions).

Base Formula:
Compression Ratio x 14.7 = Static Value
Example: Manufacturers Spec of 9:1 x 14.7 = 133.7 psi
(Compare with manufacturer specification on psi)
Dynamic Compression Testing
Running Compression (with Schrader valve removed from compression gauge)
Install all spark plugs but one. Reconnect fuel and enable ignition. Ground spark plug wire for
cylinder disconnected with gauge installed. Run engine and observe highest readings.
Snap Compression
With engine running quickly snap the throttle.

Compression dynamique