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Home » Public Forums » GMCnet » VACUUM BANK (for brake vacuumVACUUM BANK A few years back, I found a plan for increasing vacuum for brake functioning. It used some 4” or so white pipe with connections to the vacuum from the engine. I have the t)

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VACUUM BANK [message #331900]

Thu, 10 May 2018 10:44

scheibejn

Messages: 35
Registered: March 2013
Location: Stillwater, MN

Karma: 0

Member

VACUUM BANK

A few years back, I found a plan for increasing vacuum for brake functioning. It used some 4" or so white pipe with connections to the vacuum from the engine. I have the tanks with the fittings installed and can get hoses. Can't find the drawing. S'pose I could figger the thing out but the drawings and explanation were helpful. Anybody have that stuff?
Jim Scheibe
scheibejn@gmail.com
6351 St. Croix Trail North Apt 230
Oak Park Heights, MN 55082

Jim Scheibe 1977 Kingsley 26' GMC PD(parlor diesel)4106, 93 Volvo, 96 Volvo, Oak Park Heights MN 55082 On the gorgeous St. Croix River lookin' at WI shore

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Re: VACUUM BANK [message #331901 is a reply to message #331900]

Thu, 10 May 2018 10:50

scheibejn

Messages: 35
Registered: March 2013
Location: Stillwater, MN

Karma: 0

Member

A few years back, I found a plan for increasing vacuum for brake functioning. It used some 4" or so white pipe with connections to the vacuum from the engine. I have the tanks with the fittings installed and can get hoses. Can't find the drawing. Does anyone have that drawing. S'pose I could figger the thing out but the drawings and explanation were helpful. Anybody have that stuff?

Jim Scheibe 1977 Kingsley 26' GMC PD(parlor diesel)4106, 93 Volvo, 96 Volvo, Oak Park Heights MN 55082 On the gorgeous St. Croix River lookin' at WI shore

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Re: VACUUM BANK [message #331903 is a reply to message #331900]

Thu, 10 May 2018 11:06

Chris Tyler

Messages: 458
Registered: September 2013
Location: Odessa FL

Karma: 7

Senior Member

I put on a vaccuum reserve tank I had laying around. They are often used on hot rods with radical cams that have poor idle vacuum.
It captures the vac when you let of the throttle whic is higher than the idle
It made no difference on the GMC as it wont increase the vac all that much although it does give you a larger reserve

76 Glenbrook

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Re: [GMCnet] VACUUM BANK [message #331906 is a reply to message #331901]

Thu, 10 May 2018 11:23

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

You would use a line from the engine intake manifold vacuum fitting to the tank and another line from the tank to the vacuum booster check valve.
Usually it will only give you one or two good brake applications if your engine should stall so in my opinion it really isn’t a great substitute for a good auxiliary vacuum pump.

If you stall going up hill be ready for someone to jump out and put a block of wood that you carry by the door behind the tire to keep you from rolling back when the vacuum in your pipe is depleted.

Emery Stora
77 Kingsley
Frederick, CO

> On May 10, 2018, at 9:50 AM, James Scheibe wrote:
>
> A few years back, I found a plan for increasing vacuum for brake functioning. It used some 4" or so white pipe with connections to the vacuum from the
> engine. I have the tanks with the fittings installed and can get hoses. Can't find the drawing. Does anyone have that drawing. S'pose I could figger
> the thing out but the drawings and explanation were helpful. Anybody have that stuff?
> --
> Jim Scheibe
> 1977 Kingsley 26' GMC PD(parlor diesel)4106, 93 Volvo, 96 Volvo,
> Oak Park Heights MN 55082
> On the gorgeous St. Croix River lookin' at WI shore
>
> _______________________________________________
> GMCnet mailing list
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Re: VACUUM BANK [message #331907 is a reply to message #331900]

Thu, 10 May 2018 11:38

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

I am actually reading this looking at the st. Croix river in taylors falls.

Jim Bounds has the diagram for the vacuum reserve. It is in his member pages, but i bet he would email it to you.

. I believe ken henderson has them as well. Yep- Copied from gmcnet:

Go to Lowes, Home Depot, or similar and get a 1/4 MPT to Tube adapter
fitting. Also get a 30" section of 4" schedule 40 PVC pipe and two end
caps to fit, and the cement to attach those caps to the ends of the pipe.
You can probably find 3 heavy duty 18"+ cable ties there too.

Go to a junk yard and get a brake vacuum check valve from a junker (25% of
the NEW Help rack valves I bought were bad -- never got a bad junked one).

Drill one of the end caps to accept the vacuum-holding side of the check
valve and glue the valve in the hole (I use Plumber's Goop -- or some other
Goop). Drill and tap the pipe near that end cap to accept the 1/4 MPT to
Tube adapter and install same (you CAN just glue it in, but threading is
better). Glue the caps on the pipe. The reservoir is complete.

Put the new reservoir inside the rear of the front cross member and secure
it there with the cable ties (or your better idea). Disconnect the vacuum
line to the engine from the brake booster and attach it to the check valve
in the end cap -- hopefully it will reach; if not, disconnect BOTH ends of
the line and connect it between the booster check valve and the side
fitting on the reservoir. Now, use ANOTHER vehicle to go get enough 3/8"
vacuum hose to complete the installation -- reservoir to booster or engine
to reservoir.

Install the second hose and you're done. One added check valve to fail
(non-catastrophically), and 3-5 more brake applications for <$20.

Ken H.

On Fri, Jan 3, 2014 at 4:30 PM, GEORGE BUTTS wrote:

>
>
> I saw something about building a vacuum reservoir with large PVC pipe to
> build a static device to replace the pumps many of us use to maintain
> stopping ability if engine stops. Anyone remember where to find the info?
> --
>
- show quoted text -

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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