[Healeys] Another backfiring question

[Kees Oudesluijs]

Op 30-1-2021 om 15:05 schreef 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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>>
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>