[GMCnet] What did this GM vacuum pump originally come on? [message #313743] |
Fri, 24 February 2017 17:30 |
BobDunahugh
Messages: 2465 Registered: October 2010 Location: Cedar Rapids, IA
Karma: 11
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I bought it at a GMCMI event. My problem is that I didn't think about the fact that the wiring plug wasn't there. And I don't know what it came on to find out how to wire it. The 4 terminals are labeled A B C D. The part number on the end is 5048679. There are two ports. With one labeled outlet on a funnel shaped piece. Does the outlet port go to the brake booster?
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313809 is a reply to message #313805] |
Sat, 25 February 2017 22:33 |
emerystora
Messages: 4442 Registered: January 2004
Karma: 13
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That would help the recovery time but the extra degree of vacuum, about 3" more vacuum, gives more braking so two pumps would not give a lower vacuum than one pump
Emery Stora
77 Kingsley
Frederick, CO
> On Feb 25, 2017, at 8:54 PM, Pete Smith wrote:
>
>
>
> "I switched to the Long pump which was from a Ford electric car (Azure) but that pump is no longer available. That pump puts out a lot more vacuum.
>
> Emery Stora"
>
>
> Could you run two of the GM ones in parallel? Twice the vacuum and maybe redundancy as well?
>
> Pete
>
>
>
>
> --
> Cary, NC
>
> No Coach yet but likely center kitchen, dry side bath Royale, 78, 403, hopefully with good original white Imron paint.
>
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313840 is a reply to message #313805] |
Sun, 26 February 2017 18:42 |
Ken Henderson
Messages: 8726 Registered: March 2004 Location: Americus, GA
Karma: 9
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IMHO, the way to use the old GM vacuum pumps is to install them between the
engine and a vacuum reservoir (30" of 4" PVC in the rear of the #1 front
crossmember), with that reservoir supplying vacuum to the booster.
That way, the vacuum stored in the booster, and another 3 applications in
the reservoir, will begin at the highest vacuum last created by the engine
during deceleration, but never lower than what the pump is capable of
creating.
Ken H.
On Sat, Feb 25, 2017 at 10:54 PM, Pete Smith wrote:
>
> Could you run two of the GM ones in parallel? Twice the vacuum and maybe
> redundancy as well?
>
> Pete
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313841 is a reply to message #313840] |
Sun, 26 February 2017 18:46 |
Mr ERFisher
Messages: 7117 Registered: August 2005
Karma: 2
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But only good for one pump.
On Sun, Feb 26, 2017 at 4:43 PM Ken Henderson
wrote:
> IMHO, the way to use the old GM vacuum pumps is to install them between the
> engine and a vacuum reservoir (30" of 4" PVC in the rear of the #1 front
> crossmember), with that reservoir supplying vacuum to the booster.
>
> That way, the vacuum stored in the booster, and another 3 applications in
> the reservoir, will begin at the highest vacuum last created by the engine
> during deceleration, but never lower than what the pump is capable of
> creating.
>
>
> Ken H.
>
>
> On Sat, Feb 25, 2017 at 10:54 PM, Pete Smith wrote:
>
>>
>> Could you run two of the GM ones in parallel? Twice the vacuum and maybe
>> redundancy as well?
>>
>> Pete
>>
>>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313843 is a reply to message #313743] |
Sun, 26 February 2017 19:22 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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By test, my reservoir is good for three stops with no engine. Since the NO is going to hook up the power to the pump, we'll have to ask him how it does with the pump running. I suspect it will keep you from hitting things.
--johnny
NO = New Owner
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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