[Healeys] Another backfiring question

[Michael Oritt]

If all else fail check your fuel pump for sufficient delivery.  I can't
remember for sure but believe a free-flowing SU is supposed to pump a
gallon in a minute, but I'm sure someone will correct me if I am wrong.

Best--Michael Oritt



On Fri, Jan 29, 2021 at 9:14 AM healeyguy--- via Healeys <
healeys at autox.team.net> wrote:

> Len and Listers
> Pushing the pin up to lift the piston is the start of the "test the
> mixture setting" exercise. You begin the push, ever so slightly,  and
> listen to the idling engine. The idle goes up.  What do you do next? You
> continue to raise the pin  to see what happens. If the idle continues to
> rise you know you are in a rich condition. If the idle stops going up and
> starts to drop off the mixture is pretty close. If the idle does not
> increase from the start you usually assume you are in a lean condition.
> This gets the carb mixture close at idle which in theory means the carb is
> going to operate throughout the RPM range.
>
> There is one other assumption here, that being that the carbs is in the
> same condition as new mounted on an engine operating as new. That is when
> allot of other stuff comes into play.  The carb float bowl items,
> needle/seat and float level  must be set correctly. Float must not be
> leaking thus making it sink. Carb must have the correct main needle and jet
> and they have to be installed and adjusted correctly. Flutter at high RPM
> may indicate that the piston spring in the suction chamber is weak or the
> incorrect spring installed. Ignition timing and condition and setting of
> ignition points.
> The list goes on and on......
> P
>
>
> -----Original Message-----
> From: Leonard Berkowitz <DrBerkowitz at hotmail.com>
> Subject: [Healeys] Another backfiring question
>
> Hi all
>
> Just finished repairing and reinstalling the carburetors on my BJ7. I
> thought I had everything adjusted properly. According to my Haynes Manuel
> the engine speed should increase slightly when you lift the piston a very
> small amount. Mine does that.  My dwell angle is where it needs to be and
> the car starts and idles nicely. Also sounds beautiful when I punch the
> accelerator linkages. The problem is that when I get it up to 60-70 mph I
> get what sounds like backfiring into my carburetors. Also sounds like it
> doesn’t have a whole lot left in the tank, so to speak. Does that sound
> like I am running too rich or too lean?
>
> Len Berkowitz
>
>
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