1977-79 Models

Check or adjust ignition timing with engine at specified RPM and both distributor vacuum advance hoses connected. Adjust timing by turning distributor until mark on flywheel aligns with reference edge on clutch housing. See Fig 1.

Fig 1: 924 Ignition Timing Marks

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
1974-76 Models
	1.8L	800-900	7.5°BTDC
	2.0L	3500	27°BTDC
1977 Models		850-1000	10°ATDC
1978-79 Models		900-1000	3°ATDC