James Juhas writes:
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?
I've run HS6 carbs since the mid-80's. The port is indeed advance, not
retard. I carefully drilled a port for retard in the rear carb and plugged
the
advance port when I installed mine, but found I was still having scary rises
in engine temperature in summer traffic (Jersey shore in August, including
Garden State Parkway with its many toll booths, is murder).
I wound up plugging the vacuum line from the retard port. Summer traffic
jams were no longer an issue, and performance was not affected.
If you can pass emissions inspection without the retard functioning (I
could), you don't need it.
Jim Knight
'71 TR6 with HS6 carbs and late model, 13 blade fan (also an improvement in
summer traffic for early models)
|