[Healeys] Another backfiring question

[Michael Oritt]

Bob--

Well I knew it was *some* easily-measurable quantity per minute and was
going to put down a quart, which pretty much corresponds to 18 gph.
So I'd suggest to Len that since the problem appears to be an issue at high
speeds which would correspond to high fuel consumption, that he test his
pump's fuel delivery with an open head at a point just before the float
bowls .

Best--Michael Oritt

On Fri, Jan 29, 2021 at 6:43 PM Bob Haskell <rchaskell at earthlink.net> wrote:

> Michael,
>
> I believe the AUF300/AZX1300 pumps put out about 18 US gallons per hour.
>
> Cheers,
>
> Bob Haskell
> '60 AH3000 BT7 (big project)
> '62 AH3000 BT7 (smaller project)
> '64 Mini Cooper (small project - by definition)
> '68 BMW 1600 (first car - project)
> '80 MBG LE (running?)
>
> -----Original Message-----
>
> From: Michael Oritt
> Sent: Jan 29, 2021 5:12 PM
> To: Perry Small
> Cc: "healeys at autox.team.net"
> Subject: Re: [Healeys] Another backfiring question
>
> 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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