David:
If everything is right, there is no reason why a tri-carb Healey won't idle
smoothly at the recommended RPM (650 -700) - mine does. There is nothing
wrong with the HS4 carb - they were used sucessfully on thousands of LBC's -
ie, all of the MGB's until the HIF carb appeared.
Having said that, tri-carb Healeys are a bit tricky to set up in terms of
synchronizing throttle linkages, mixtures, etc. etc. One of my favourite
'Healey' expressions is: "The main trouble with SU carbs is the Lucas
electrics". (One could make a case that the reverse is true as well!)
If you are having an idle problem there is something not right - ignition
timing, distributor problems - (bad vaccuum advance unit, or leak in the
line), a jet hanging up slightly (you hinted at that earlier), air leaks at
the carb or intake manifolds, worn needles, worn throttle shafts - the list
goes on and on.
One spot to watch out for on the tri-carb - one of the 2 bolts that hold the
heatshield onto each of the 3 intake manifolds is in a hole that is open to
the passage - the threads have to be sealed with a thread sealer. (the
others are blind holes, the carb studs do the rest). I have found major air
leaks there on a couple of tri-carbs when the bolts loosened or in one case,
were completely missing.
It's going to take a bit of detective work.
Fun, ain't it!
Earl Kagna
Victoria, B.C.
BT7 tri-carb
BJ8
----- Original Message -----
From: "davidwjones" <davidwjones@cox.net>
To: <healeys@Autox.Team.Net>
Sent: Monday, October 25, 2004 9:08 PM
Subject: Tricarb Idle
Have any of you tricarb-ers out there ever seen-heard-owned a tricarb that
would idle smoothly at anything under 1200 rpm? Or is it just too much to
ask
of the rudimentary HS4 carbs?
David W. Jones
'62 Mk II BT7 tricarb
Cumberland, RI USA
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