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Home >> Ford >> 1985 >> Bronco 4.9 Y, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 4.9L 6-CYL >> Testing >> Engine Compression

Engine Compression

Test compression with spark plugs removed, engine at normal operating temperature and throttle wide open. Crank engine through at least 5 compression strokes before recording reading.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 8.9:1
Max. Variation Between Cylinder Less Than 25%
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