You can set up an ignition w/o the vacuum advance; it was done for
years. The vac advance is an additional advance to the centrifugal
advance, that will advance spark a bit during low-load times, as when
cruising at steady speed, as the engine can benefit from additional
advance then. When manifold vacuum drops during accelleration or hill
climbing, the advance returns to where the centrifugal advance has put
it, for greater power and less liklihood of knocking.
Notice how the tune-up instructions always direct to disconnect and plug
vac lines before setting timing with a timing light? That's to take the
vacuum advance out of the test, so just the centrifugal advance is set at
On Fri, 22 Jul 2005 14:22:31 -0400 "Randy Widman"
> WOW !!!!
> I never thought of that thing missing a rubber hose ! I bought my 79
> and it
> never had anything hooked up there and it seems to run fine. Should
> it have a
> hose on if using a Weber carb which was on it when I bought the car
> or doesn't
> that make any difference?
> Randy Widman
> '79 Red B