Quote:
Originally Posted by Ziggster
Seems the whole topic of spark advance on these engines using the vacuum signal is either not well understood or avoided
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How the advance works is well understood.
The vacuum component is likewise well understood and not avoided. It is a very simple system, the vacuum operates a brake on the advance plate to hold back the mechanical advance at low manifold vacuum. With modern fuels the adjustment is normally backed-off to the point very little to no braking is used. If you did have a pinging situation you would add brake pressure to reduce it.