[Healeys] Another backfiring question

[Kees Oudesluijs]

The SU AUF 301/303/305 fuel pump should deliver 15 Imperial 
gallons/hour. Maximum pressure should be 3,8psi.

Kees Oudesluijs



Op 29-1-2021 om 23:12 schreef 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 <mailto: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
>     <mailto: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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