William,
IIRC this vent started in 73, and is related to emission control.
It vents fumes from the carb/float to the charcoal canister.
Like you, I had a helluva time adjusting timing, idle speed and
happened on this as the culprit. So, being a good shade tree
mechanic, I removed it. The idle adjustment now works wonderfully.
Ken
73 '6 CF7000U0
: Does anyone on the list know what the function of the
: Float Chamber Vent Port Plunger is on the later
: Stromberg carbs? It is activated by an "L" shaped cam
: by the throttle shaft.
:
: There is no mention of it in any of the manuals I
: have. Nelson Riedel briefly mentions it in his text on
: carb rebuilds but doesn't really offer an explanation
: as to why it is there or how you should really adjust
: it.
:
: I have had a problem where I would "run-out" of idle
: adjustment and could only get the car down to about
: 1000 rpm with the vacuum retard disconnected and the
: timing at 12 BTDC. I've checked exhaustively for
: vacuum leaks etc but could never find anything wrong.
:
: Then this weekend I noticed the set screw for the
: float chamber vent port plunger was holding the
: throttle plate slightly open at idle. I backed out the
: set screws on each carb and viola! now I have plenty
: of "screw" for idle adjustment. (the set screws were
: marred up badly so some PO must have "tweaked" them in
: the past")
:
:
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