Ignition Timing

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Warm engine to normal operating temperature and disconnect both distributor vacuum lines. Connect tachometer and timing light. With engine idling, rotate distributor until mark on pulley is lined up with reference mark on blower housing.

Fig 1: Ignition Timing Mark Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

IGNITION TIMING (Degrees BTDC@RPM)

Application

Timing

911SC

⁽¹⁾ 5@950

⁽¹⁾	Distributor vacuum lines disconnected.