Vintage VW Training Film shows well how to keep Air-cooled Beetle even now---over 50 years old production. Especially complicated distributor control after 1971 that is completely different from those before inviting Muskie Act for anti-pollution.
As a common sense, combustion firing timing is set around BTDC 10 degree, but VW introduced ATDC 5 degree with dash-pod device to prevent quick rotation down at idle speed. The purpose of additional device is nothing but excessive amount of Hydro Carbon and Carbon Oxide in exhausted gas. It was extremely difficult to implement countermeasures applying conventional equipment and service engineers had very hard time to adopt with new Road Transport Vehicles Act.
Actually, double diaphragm vacuum advancer, ATDC 5 degree at idle and delayed returning speed with dash-pod looked so strange.
Thank to such a strange and queer additions I was so disappointed by spilled drive feel so I remember as a clear memory. Combustion firing timing suffer and dull response brought very bad drive feel without discussions. It was often the case that characters of motor response differ completely around 1970.
Consequently, my Super Beetle need to know the most suitable firing timing setting though the point is shown between 4~7 degree in the scheme, the discrepancy 3 degree causes much disparity without doubt. Repeating test run by myself is the residual way.
By throttle opening at 1500 rpm to 2000 rpm, seeking the most stable timing might be the way.
"Establishing Maximum Combustion Efficiency Firing Timing" is the Goal. Small space of 11AD engine room is nothing but a Garden of Blis for me! As I hate the word "Tolerance", want I null pin point. Am I a fool?
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