Ray -
If I read what you are saying correctly, is you are saying that you should
lift the pin (or piston) of the front carb if adjusting the jet on the rear
carb to check mixture (and vice versa) - this method sounds unconventional,
but the carbs (esp on the 2-carb 6 cyl healey) do have a direct effect on
each other because of the common intake manifold. I can tell you, however,
this method will not work on a tricarb or 100, because the balance tubes are
quite small.
At the end of the day, the idle mixture adjustment is exactly that - the
idle mixture. Your only purpose in getting this balanced is to get the car
to run smoothly at idle. Once you step on the gas, all the adjustment in
the world becomes less relevant with an SU carb.
You should only be adjusting carbs to get your engine to idle as smooth as
possible while at idle. How you do it is up to you.
Alan
'52 A90
'53 BN1
'64 BJ8
On Sat, Mar 28, 2009 at 10:50 PM, Ray Carbone <racarbon@optonline.net>wrote:
> Over the past 40 years I have adjusted my share of SU carbs but recently I
> find that I may have been doing it wrong. I have always been under the
> impression that the pin on each HD8 was used to adjust that carburetor's
> mixture, however, recently I've read and followed the instructions of 2
> articles that indicate the pin is used to adjust the other carb (i.e. back
> carb pin to adjust the front carb and visa versa).
>
>
>
> A number of club members and sports car associates seems to indicate that
> they were also surprised by the new approach and under my original
> understanding. I can't believe I've been wrong all this time. However, the
> new (to me) way seems very logical. I would like to hear which is
> considered correct by the list.
>
> All the best,
>
> Ray Carbone
>
> 64 BJ8 Phase 1
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