The information obtained from some Web site proved the ignition timing of VW 1302S is ATDC 5 degree instead of BTDC. The reason for this unusual timing is due to double diaphragm designed vacuum advancer, some retarding effect is applied on idling RPM 850, and importance is the rate of advance around at 3,000 RPM with 30 degree advance.
Digital timing light is useful because 30 degree retarding pre-setting is available, so original marker of zero degree on crank pooley is also used as more advanced position. This kind of convenience is supplied because of digital control, also shown not only ignition timing but the RPM at that time is noticed at the same time.
According to my own experiences on automobile for 45 years, valve clearances and ignition timing,mainly intake valve, have strongly much to do with the motor performance especially on idling stability and available torque. So this AD11 motor with push rod valve drive design needs precise adjustment on those requirements, and ignition timing in relations with vacuum advancing and retarding system, complicated but interesting with not a little confidence. Actually the performance would be tested enough by future repeating driving tests.
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