Ignition Timing

With engine at normal operating temperature, idle speed at 900 RPM, and vacuum hoses left connected, ignition must be set to 5° ATDC. A second check on ignition timing must be made after this adjustment to check maximum advance. At 6000 RPM check that maximum advance is between 32-38° BTDC.

Fig 1: IGNITION TIMING MARKS

Courtesy of PORSCHE CARS NORTH AMERICA, INC.