FWIW I got a Gunson's ColorTune for Christmas last year and my car has never
run better. I had trouble discerning the color of the exhaust, etc.
If your leak isn't too bad you may be able to "overcorrect" with a richer
mixture - but once again the ColorTune would show you when you are "there".
I heartily recommend it (no financial interest, yada, yada, yada)
Tony Woodruff
'67 MGB
And now for the quote of the day...
"The day after tomorrow is the third day of the rest of your life."
--George Carlin
>>> "Paul Hunt" <paul.hunt1@virgin.net> 4/4/2000 11:39:45 AM >>>
The tail pipe will always be sooty with unleaded, it is the lead in leaded
that shows grey for a correct mixture. Stalling as a carb piston is lifted
is a symptom of weak mixture - only lift each by 1/32", by the way. You
should always be able to 'tune out' leaking throttle spindles at idle
(unless you can drive a coach and horses through the gap), but will have
other symptoms like a hesitant pickup with small throttle increases.
Setting up SUs is time consuming to do correctly, but rewarding when done.
You might like to have a look at my own info on the site below, select
'Spanners' and 'SU Carbs', but ignition, timing and valves need to be done
first.
PaulH.
http://www.mgb-stuff.org.uk
----- Original Message -----
From: <ahhclem@kcnet.com>
To: <mgs@autox.team.net>
Sent: Tuesday, April 04, 2000 3:19 AM
Subject: Intake leaks
> I have never been able to obtain a smooth idle on my 77B. No problems with
> road operation to 5,300 RPM, never had it higher. Two things I suspect: 1.
> Leaking carb.
> shafts (HIF4's) 2. Leaking manifold gasket. According to info. from this
> list the manifold gasket is on backwards, metal face to manifold. When
> either carb's piston is lifted during setup the engine slows almost to a
> stall and remains there until the piston is released. The miss is
irregular
> and the tail pipe sooty.
>
> Any advice is welcome
>
> TIA
> Rick Jennings
>
>
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