Sounds like a weak mixture causing a flat spot to me. Have you set up the
valves, ignition and carbs from first principles yet? Proved the
centrifugal and vacuum advances are working correctly? Vacuum capsule not
leaking? Random tweaks are not really the way to go about things. If you
set it up correctly and still have problems, or simply can't set iy up, then
you have a fault that must be fixed before it will work as it should.
PaulH.
----- Original Message -----
From: Scott Beavis <sbeavis@solartron.com>
To: _MGs <mgs@autox.team.net>
Sent: Thursday, August 24, 2000 2:01 PM
Subject: Power drop when accelerating
> The new MG seems to be running better now. I have richened each carb 1/2
> turn and stopped dumping the crankcase gas back into the carbs. This cured
> the uneven running below 2k. We can now cruise along at 30mph in 4th no
> problems. Before it was almost impossible without the engine revs
wandering
> and lurching. We do still have an annoying problem which I think may be
down
> to ignition rather than carbueration. We accelerating the engine pulls
well
> in 1st and 2nd but when I get into 3rd it pops and hesitates. This seems
> worse when cold. The choke doesn't have much effect but it is slightly
worse
> without choke. It is ok when accelerating gently, but when the throttle
> pedal is dipped the power level drops off and the engine note changes. It
> idles ok and revs ok so I think it could be ignition timing. As the
throttle
> is opened further the manifold vacuum drops and the ignition retards due
to
> the vacuum-advance. If the timing was slightly too retarded the engine
would
> probably run ok except when the throttles are opened up more than normal.
>
> Anyone comments on this before I start slackening dizzy clamps?
>
>
> Scott
>
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