Ignition Timing

Connect timing light and tach-dwell meter. Check cam angle, if necessary adjust to 37-42°.

Fig 1: BMW Engine Modification System Schematic

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Ignition Timing Mark

Courtesy of BMW OF NORTH AMERICA, INC.

1. Disconnect and plug distributor vacuum unit hoses. Timing mark on flywheel is visible through access hole located behind starter. Steel ball on flywheel must be indexed with pointer (on housing) when ignition is properly set.
2. Reconnect vacuum hoses to distributor vacuum unit. Set idle speed to 950-1000 RPM. With hoses connected, timing mark on flywheel should now be between OT (TDC) mark and 5° ATDC.