Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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RoverP6B
Graham Ware

(8 posts)

Registered:
08/28/2008 09:59PM

Main British Car:


Vacuum for a brake booster, manifold issue...
Posted by: RoverP6B
Date: October 28, 2013 03:49AM

I have a Rover V-8 and a decent downdraft 48IDF Weber setup to replace the twin SUs.... it has occurred to me that, as the Weber manifold is of the individual-runner type, its going to be difficult to tap vacuum off the new inlet manifold to power the brakes which is how its currently done

OK, the picture is for a Ford but you get the idea...

Any ideas for a solution ? I am guessing I could make spacer plates under the carbs which tap intake pressure, and join these up somehow... but I am guessing there might be a more elegant solution...?

best

Graham Ware



Edited 1 time(s). Last edit at 10/28/2013 03:51AM by RoverP6B.
ford8pack.jpg


Moderator
Curtis Jacobson
Portland Oregon
(4495 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Vacuum for a brake booster, manifold issue...
Posted by: Moderator
Date: October 28, 2013 11:35AM

How would you feel about using an electric vacuum pump? (Example)


roverman
Art Gertz
Winchester, CA.
(3149 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Vacuum for a brake booster, manifold issue...need more foot
Posted by: roverman
Date: October 28, 2013 12:04PM

So many, much heavier cars were built, without power assisted brakes,(including disc in front). Is it that much effort ? Ever tried to stop a power assisted brake system, with a dead engine ? Good Luck, roverman.


DiDueColpi
Fred Key
West coast - Canada
(1308 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Vacuum for a brake booster, manifold issue...
Posted by: DiDueColpi
Date: October 28, 2013 12:15PM

Hey Graham,
Your answer is in the ford picture.
The little polished pipe at the base of the #1 intake runner is likely a brake vacuum take off.
Each runner will have one that runs to the back of the manifold and joins up into a small plenum.
The plenum is then tapped for the booster or whatever vacuum driven device that you have.
This is also the way that you would supply a manifold pressure signal to a speed/density type fuel injection system.
Cheers
Fred


RoverP6B
Graham Ware

(8 posts)

Registered:
08/28/2008 09:59PM

Main British Car:


Re: Vacuum for a brake booster, manifold issue...
Posted by: RoverP6B
Date: October 29, 2013 05:33AM

Curtis: thanks that looks like just what I was looking for, much appreciated!

Art: I want to avoid re-engineering the P6B setup with a new non-boosted master cylinder if I can avoid it, its a 4 wheel disc brake setup and very good for its time... the electric motor making the suction looks like a simple solution

Fred: my manifold setup is literally individual runners and I dont want to start drilling/tapping that if I can avoid it. I appreciate that the Ford manifold pictured has this option, and apologies for the confusion, but my casting does not

Thanks to all who posted, very helpful!

Graham Ware


tr8todd
Todd Kishbach

(381 posts)

Registered:
12/04/2009 07:42AM

Main British Car:


Re: Vacuum for a brake booster, manifold issue...
Posted by: tr8todd
Date: November 02, 2013 04:27PM

[www.britishv8.org]

Lorenze doesn't run a booster on this car and it stopped just fine last time I drove it. FWIW, his car weighs over 3,000 pounds.


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