[Healeys] Another backfiring question

Sat Jan 30 10:43:27 MST 2021

Forgot to mention, The A-H fuel pump replacement is Burlen AZX1308 which 
is 3,8psi. However most sellers sell AZX1307 which 2,7psi. This usually 
works OK and is advantageous as other cars use the 1307 as well, e.g. MGB.

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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>