I'm trying to tell whether the vacuum retard unit on my 1973 TR6
distributor is working properly. When I apply a vacuum to it, it moves
but does not hold the vacuum, so returns to its resting position. It's
as if a sudden vacuum signal would move it, but then it drops back.
Should it behave this way, or is it simply leaking?
A supplementary question is: does this engine really need this feature
for performance reasons, or is the vacuum retard only an accommodation
to emissions control? I am converting this car from downdraft webers to
SUs and this provides me with a vacuum signal at the carb which, I
believe, will be present at partial and full throttle, and this seems
wrong to me to connect this to a retard unit. In the normal Stomberg
setup, where does the retard vacuum unit port attach?
Thanks.
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