Tony :
It's tough to graph ported vacuum vs throttle position, because the
vacuum does not depend only on throttle position. Let's try a brief
operational description in terms of manifold vacuum :
Retard port :
a) Throttle closed, equals manifold vacuum
b) Throttle not closed, equals much smaller value somewhat dependant on
air flow through the carb.
Advance port :
a) Throttle closed, equals small value, dependant on air flow
b) Throttle open, equals manifold vacuum
In both cases, the port is positioned such that the throttle plate moves
across the port as the butterfly opens, giving the 'two state' effect.
With the throttle closed, the retard port is very slightly on the
manifold side, the advance port is very slightly on the intake side.
Randall
Anthony Rhodes wrote:
>
> I still do not understand the physical and operational differences of the
>vacuum
> port for advance and retard.
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