[Healeys] FW: Why carry spares

[George Haywood]

From: haywoodone at hotmail.com
To: austin.healey at gmail.com
Subject: RE: [Healeys] Why carry spares
Date: Thu, 20 Mar 2014 10:01:59 -0400




Guys,

Read this, you may be surprised.

                          http://mgaguru.com/mgtech/fuel/fp125.htm


George Haywood
haywoodone at hotmail.com
'65 bj8



> From: austin.healey at gmail.com
> Date: Fri, 21 Mar 2014 00:30:21 +1100
> To: coudesluijs at chello.nl
> CC: healeys at autox.team.net
> Subject: Re: [Healeys] Why carry spares
>
> Yep Kees.
> You are correct. Accurate.
> I deliberately ignored the exact wording of the question. Deliberately.
It's
> NOT about pressure. It's about VOLUME of fuel. Listers are looking for a
> backup pump. A backup hot or cold spare fuel pump.
> What's the pressure an SU carb requires Kees?? Or a weber? That would be 3
or
> 4 psi.
> What happens if you provide 8 or 10 or more psi fuel PRESSURE to an SU
carb??
> What happens?
> The answer is - Fuel pisses out everywhere!!!!
> Easy diagnosis. Help!! There is fuel pissing out everywhere in my engine
> bay??? No one asked that!!!
> So it's actually about fuel volume.
> So I addressed that question.
> If fuel is pissing out of your Carbs, please extinguish your cigarette, and
> shut down your fuel pumps. Ok??
> Yes. Pressure is important. But this thread is not about a bunch of blokes
> complaining about fuel spraying all about their engine bay!!!!!!!!
> So rather than carrying on about on a theoretical flow bench, to measure
> pressure - let's just cut to the chase on a Healey 3000 with pumps in
> parallel. Pumps in series. Double ended pumps.
> People who have these setups.
> It's easy to measure fuel flow!!!!
> I have a pressure regulator, which is how the car was setup. And I'm not
> changing a winning formula...
> I know know it's not an issue with SU pumps. The issue is fuel volume.
> Let's measure that.
> You first Kees
> How much fuel does your fuel pump setup deliver on your 3 litre
> Healey?????????
> I'll measure mine on the weekend. Double ended SU pump, with a Malpassi
> pressure regulator.
> The issue is volume. Not pressure.
> Of course Kees, if your 3000 is pissing fuel out from its SU's - then
pressure
> is probably your problem...
> And put our the cig, and shut the welder off!!
> Sincerely.
> Chris
>
> Sent from my iPhone
>
> > On 20 Mar 2014, at 6:54 pm, Oudesluys <coudesluijs at chello.nl> wrote:
> >
> > Chris,
> >
> > That would be a flow test, not a pressure test, which is certainly not
the
> same.
> >
> > For a pressure test you would need a fuel pressure gauge to measure the
> output pressure of :
> > 1: one single pump, nr. 1
> > 2: one single pump, nr. 2
> > 3: two pumps in line, nr. 1 pump switched on  and nr. 2 pump switched of,
> the result should be similar to test 1
> > 4: two pumps in line, nr. 2 pump switched on  and nr. 1 pump switched of,
> the result should be similar to test 2
> > 5; two pumps in line, both pumps switched on, the result should be the
sum
> of test 1 and 2
> >
> > In all test situations the flow should be more or less the same,
depending
> on the resistance in the output line. You would only double the flow if you
> have the pumps fitted in parallel.
> >
> > It is assumed that Lucas type pumps are used. Other type of pumps may
give
> different results in test 3 and 4 and the flow test. E.g. gear and vane
type
> of pumps may show no or little flow and pressure in these tests as they
will
> (partially) block the fuel line when not switched on.
> >
> > Kees Oudesluijs
> > NL
> >
> > Chris Dimmock schreef op 20-3-2014 3:10:
> >> It's pretty simple to test.
> >> Just disconnect the fuel line, point it into a bucket, turn the one pump
> on,
> >> run it for 30 seconds, and measure the volume of fuel in the bucket.
> >> Empty the bucket.
> >> Then turn both pumps on, run them for 30 seconds, and measure the fuel
> pumped
> >> into the bucket.
> >> Report back here.......
> >> That volume of fuel x2 is the delivery volume per minute.....
> >> X 120 = volume per hour.
> >> It's not Formula one, close enough is good enough, you won't get in
> trouble
> >> with the FIA....
> >> Easy.
> >> Best
> >> Chris.
> >>
> >> Sent from my iPhone
> >>
> >>> On 20 Mar 2014, at 11:14 am, rwil at sbcglobal.net wrote:
> >>>
> >>> Could it possibly be time for some physical measurements on a test
> >>> setup to see:
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