[Healeys] Another backfiring question

[Bob Haskell]

Kees,

SU pumps come with different delivery pressures: 3.8 and 2.7 psi.  I 
always thought that the big Healeys used the lower 2.7 psi.  But while I 
know the pump specification that should be fitted to my car (AUA 72), 
I've never run across a piece of SU literature that gives the delivery 
pressure for each pump specification.  Can you point me towards one?

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 1/30/21 1:05 AM, Kees Oudesluijs wrote:
>
> 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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