Actual measurement, "mildly warmed" street TR4 with 42 DCOE's : 10%
improvement in fuel mileage by connecting the vacuum advance.
Since Weber's have no advance port, ingenious TR4 owner wired/plumbed an
electric solenoid to apply manifold vacuum to the advance only when the
throttle was off-idle. Such solenoids are common on US 'smog motors', my
wife's 89 Dodge Caravan has several of them ...
Randall
Anthony Rhodes wrote :
> Since the
> advance/retard effect seems to be "minor", then I will not go to
> great lengths (expense?) to get a
> UK version distributor with vacuum advance (if such exists).
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