[Healeys] Why carry spares

[Tracy Drummond]

Been running two facet pumps in series for about 7 years. They work great in
series.  I switch back and forth once in a while and have the center
position for theft deterrent under dash.  I did run two wires in a sheath
(off road driving lights wiring leftover from fog light relay project) all
the way from front to back. I never had one go out and still carry another
in the boot.  I have loaned the boot one out a few times. :-)


-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Bob Haskell
Sent: Wednesday, March 19, 2014 7:17 PM
Cc: Ahealey help
Subject: Re: [Healeys] Why carry spares

I sent an email to Dave Dubois and asked if he's done any testing with two
pumps in series.

If anyone has any long body LCS pumps that their Healey no longer needs, I
might be interested.  I'm looking for "cores" with undisturbed coil/coil
housings.  Dirty, non-functional and incomplete is fine. 
Won't make you rich, but will cover shipping in the lower 48.

Cheers,

Bob Haskell
AHCA 3000 Mk I registrar
http://www.ciahc.org/registry_3000mk1.php

On 03/19/2014 09:09 PM, I Erbs wrote:
> Great idea...who has the bits and the time????
>
> Ira Erbs
> IT Educator and Consultant
> Portland, OR.
>
> Sent from my mobile phone. What you get may not be what I typed.
> On Mar 19, 2014 5:14 PM, <rwil at sbcglobal.net> wrote:
>
>> Could it possibly be time for some physical measurements on a test 
>> setup to see: what output pressure with two pumps in series, both 2 
>> SU and 1SU and 1Facet (or similar), and in parallel? and what happens 
>> when one of the pumps in series packs it in?
>>
>>  From reports here it looks as if SU pumps are pretty patient with 
>> all possible setups.
>>
>> -Roland
>> On Wed, 19 Mar 2014 16:01:59 +0000 (UTC), you wrote:
>>
>>> OK, I'm not a theoretical physicist, and don't play one on TV, and 
>>> we're
>> not
>> talking electronics so I don't see how running two pumps in series 
>> doubles the output pressure. AFAIK, the output pressure of an SU pump 
>> is determined by the strength of the spring that pushes the diaphragm 
>> (presuming the solenoid is strong enough to compress an even stronger 
>> spring). There may be some internal 'regulation'--there is a small 
>> hole between the input and output chambers on
>> BN1/2 pumps that may provide a pressure limit by bypass--but no real 
>> pressure regulation. So, if the spring is capable of producing, say, 
>> 3PSI when the solenoid is switched off, then the output to the second 
>> pump will, at most, push the spring back some but it wouldn't add to 
>> the 3PSI.
>>>
>>> IOW, a spring capable of pushing a diaphragm at 3PSI won't be able 
>>> to
>> push at
>> 6PSI, just because the incoming pressure is greater. Anyone actually 
>> measured the pressure of two SUs in series?
>>>
>>> Bob
>>>
>>> ----- Original Message -----
>>>
>>>
>>>
>>> Two pumps in series might not be suitable for a racing Healey, but 
>>> they
>> have
>>> worked just fine on my street BJ8 without any problems for a long time.
>>> It's just simpler to plumb them in series than in parallel, in my
opinion.
>>> If you have two pumps in parallel with separate switches, then you 
>>> can run both pumps at the same time and get twice the flow rate at 
>>> the same output pressure. Running two pumps in series at the same 
>>> time will provide the same flow at double the output pressure - not 
>>> good for the carbs. So, for pumps in series there should be only one 
>>> switch to prevent running both pumps at the same time.
>>>
>>>
>>>
>>> Steve Byers
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