What's happening is the vacuum advance at light loads is advancing
timing which improves fuel economy for one thing. When you open the
throttle the vacuum in the manifold is destroyed and timing is retarded
and then advances as revs rise due to the centrifugal weights in the
dizzy. Normal.
Craig.
> Wayne wrote:
>
> Craig,
> Thanks for the reply. I don't drive the old girl much, so I will
> give it a
> go.The head should be pretty good as it is a yella terror that I got a
> local
> head wiz to work his magic on. But it still has steel valves.Might pay
> to
> be safe and have hardened seats & bigger stainless valves put in. It's
> due
> for a dizzy regraph and dynotune, so i'll get that done with a tank of
> optimax.
>
> Regarding dizzy's, the dizzy in it (COMMODORE HEI ELECTRONIC) retards
> when you first open the throttle, then advances as your revs rise. As
> it is
> a worked atmo holden 6, shouldn't it advance only?
>
> -Wayne
>
>
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