[DeTomaso] Brake booster vacuum

[Brent Stewart]

Sean,
I have this exact same setup, and exact same problem!  Check this picture out:

http://poca.com/gallery2/main.php?g2_itemId=4841 


Now, take a look at the ones with engine and CHI intake:

http://poca.com/index.php/gallery/?g2_itemId=38288 


The mistake I made was to have the intake chromed, and didn't realize it didn't have the additional vacuum tap for the brakes. Now it is too late to drill. I had to get the 1" spacer and now I have kind of a funky linkage setup and an air filter that just about hits the top of the car.

I'd recommend that you get the CHI intake tapped in the back so you can easily hook up your brake vacuum and use the port on the carb for your PCV valve.  The spacer puts the carb way to high, and I think performance must suffer.

I am actually looking at getting an external vacuum pump to run the brakes, but haven't pulled the trigger.  I would need one that would not "boost" vacuum, rather, completely replace the vacuum from the engine.  do let us know what you end up doing!

brent




________________________________
 From: "JPEP33 at aol.com" <JPEP33 at aol.com>
To: seanmundy at hotmail.com; will.kooiman at gmail.com 
Cc: detomaso at realbig.com 
Sent: Wednesday, October 3, 2012 3:33 PM
Subject: Re: [DeTomaso] Brake booster vacuum
 
The port on the carb base can be used for the PCV to the valve cover  
connection. He still needs a port (preferably on the intake manifold) for the  
brake booster line.


In a message dated 10/3/2012 4:34:15 P.M. Central Daylight Time,  
seanmundy at hotmail.com writes:


Oh,  that's right I do have a larger port at the base of my Holley 750.  It 
was previously hooked up to the PCV on top of the valve cover.  Do I  
still need the PCV?


> CC: detomaso at realbig.com
> From:  will.kooiman at gmail.com
> Subject: Re: [DeTomaso] Brake booster  vacuum
> Date: Wed, 3 Oct 2012 17:18:47 -0400
> To:  seanmundy at hotmail.com
> 
> There should be a large port on your  carburetor.
> 
> Sent from my iPhone
> 
> On Oct 3,  2012, at 4:24 PM, sean mundy <seanmundy at hotmail.com> wrote:
>  
> > 
> > I've just realized while mocking up my new engine  that my chi single 
plane
> > intake does not have any outlets for  hooking up the brake booster 
vacuum hose.
> > Is it common to have to  drill and tap a port in the intake for the 
vacuum hose? 
> > Where on  the intake should the port be located?
> > Should I consider an  electric boost pump? 
> > 
> > Thanks, Sean
> >  
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