Check the intake manifold for tightness/air leaks. I once had a Mini that
had a similar problem and it turned out to be a lose manifold.... if that's
okay look at the dizzy...points tight ? advance plate secure ? Vacuum
advance ?
Chuck Young
Las Vegas, NV
62 & 79 Midgets
----- Original Message -----
From: "Ptegler" <ptegler@gouldfo.com>
To: <spitfire-enthusiast@egroups.com>; <triumphs@autox.team.net>;
<spridgets@autox.team.net>; <spitfires@autox.team.net>; <mgs@autox.team.net>
Sent: Sunday, January 14, 2001 9:02 PM
Subject: Re: [spitfire-enthusiast] Pulsing and surging
> Needles were my first route (way back when)
> K&N's went to ABD than AAA...
> then bought new carbs. Even went to #7's after
> getting rid of the biased needle setup.
> Have tried lighter, and heavier carb piston springs
> ...still does it.
>
> Paul Tegler wizardz@toad.net http://www.teglerizer.com
>
> -----Original Message-----
> From: John Kipping <johnkipping@inet.net.nz>
> To: spitfire-enthusiast@egroups.com <spitfire-enthusiast@egroups.com>;
> triumphs@autox.team.net <triumphs@autox.team.net>;
spridgets@autox.team.net
> <spridgets@autox.team.net>; spitfires@autox.team.net
> <spitfires@autox.team.net>; mgs@autox.team.net <mgs@autox.team.net>
> Date: Sunday, January 14, 2001 9:35 PM
> Subject: Re: [spitfire-enthusiast] Pulsing and surging
>
>
> >Paul,
> >It sounds like a classic weak mixture to me, especially if pulling the
> choke
> >out stops the problem. From the late sixties there was a drive for more
> >economy and better emmissions, and so cars where set to run leaner and
> >leaner, so even with everythin on the car correct care has to be taken
not
> >to try and set it too lean, as then the car won't go properley and
> >perversely more fuel is consumed. With the inevitable wear in
particularly
> >carb jets and needles fitting new standard items can result in more
> problems
> >as worn items wear rich, and with any deviation from a standard spec
richer
> >needles are required as the bolt on goodies inevitably flow better and so
> >weaken the mixture. Apart from some standard bolt on combinations and
carb
> >specs where a correct replacement needle is well known a car will have
to
> >be set up on a rolling road, where the CO/CO2 balance can be analyzed
under
> >all conditions.
> >John Kipping
> >
> >-----Original Message-----
> >From: Ptegler <ptegler@gouldfo.com>
> >To: triumphs@autox.team.net <triumphs@autox.team.net>;
> >spridgets@autox.team.net <spridgets@autox.team.net>;
> >spitfires@autox.team.net <spitfires@autox.team.net>; CARS
> >spitfire-enthusiast egroups <spitfire-enthusiast@egroups.com>;
> >mgs@autox.team.net <mgs@autox.team.net>
> >Date: Monday, 15 January 2001 14:23
> >Subject: [spitfire-enthusiast] Pulsing and surging
> >
> >
> >>OK... here we go... this problem has not
> >>changed through all the following repairs
> >>and upgrades.
> >>
> >>Driving at steady constant speed I get a pulsing
> >>or surging/dropout (what ever you want to call it)
> >>You pull the choke out and it disappears with
> >>it seeming like a bit more power coming in.
> >>I've replaced fuel pumps, carbs, added fuel
> >>pressure regulators, changes carb piston springs,
> >>changed carb needles, air filter styles (stock -
> >>free flow) exhaust system diameters, manifolds,
> >>head gaskets. re-curved and /or rebiult distributors, changed
> >>dist. models, points and electronic conversions.
> >>
> >>This problem appears on more than one marque
> >>I own.
> >>
> >>Anyone have any wild ideas? past experiences?
> >>Wonderments?
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