> When one puts the pedal to the metal, does the manifold vacuum act to retard
> or advance the timing? Is the manifold vacuum higher or lower with the
> throttle open wide? Anybody know of a good book on this basic stuff?
>
> Bob Donahue (Still stuck in the '50s)
> EMAIL - BOBMGT@AOL.COM
> 52 MGTD - under DIY restoration NEMGTR #11470
> 71 MGB - AMGBA #96-12029, NAMGBR #7-3336
Bob,
Manifold vacuum is at its lowest at wide-open throttle, and
generally highest at idle or low throttle positions. That's why
many of the "fuel economy" gauges are simply vacuum gauges, marked
"poor", "fair", "good", and "excellent" as vacuum increases.
Scott
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