[DeTomaso] Brake vacuum source

[Robert Stroj]

Hi Mike,

 

Yes, it is a high single plane manifold with no provision for vacuum; I was
also told by engine builder that cam spec I got would not really provide a
sufficient vacuum and I would be better off using the vacuum pump..

I thought that there should be a good solution to be used on track/street
car; aren't they various modern cars (in particular turbo diesel) that use
electric vacuum pumps for this purpose?

Would I need additional vacuum reservoir or not?

Would be nice to find all-in-one solution that includes reservoir (if
needed), pump and a vacuum controlled switch.

 

Thanks, Robert

 

From: MikeLDrew at aol.com [mailto:MikeLDrew at aol.com] 
Sent: Thursday, July 02, 2015 6:51 AM
To: npdrs at maui.net; detomaso at poca.com
Subject: Re: Brake vacuum source

 


In a message dated 7/2/15 5 23 23, npdrs at maui.net writes:





Hello, I am just having new engine installed into my '71 and will no longer
have a reliable source of vacuum available for the brake booster.
Could someone please recommend a proven electric vacuum pump setup and where
to buy it?
It would be great if possible to find a source in Germany (or Europe) as the
car is in Germany.


>>>Robert--I assume the problem is that your new engine is fitted with a
'race' intake manifold that has no provisions for vacuum take-off?  That's
the problem with such things.

One solution is to have a bung welded to one of the intake runners.  When I
faced the same problem with my GT350, I took a different path.  I fitted a
Boss 302 carb spacer, which has provisions for brake vacuum, yet is very
thin to provide hood clearance.

I got mine here:

http://www2.cougarpartscatalog.com/bossspace.html

You could always just get a typical one-inch spacer, but that adds height
that you don't want.  This spacer is very, very thin; the round pipe goes
oval as it enters the side of the spacer, reducing height, yet the total
area remains unchanged.

http://image1.cougparts.com/dc/16203/1430333053_l.jpg
http://image1.cougparts.com/dc/16203/1430333006_p.jpg
http://image1.cougparts.com/dc/16203/1430333005_g.jpg

(Those are photos of a used original, not the new repro, which is built to
the same standard but obviously looks new).

Note that it is somewhat fragile; if you manhandle the hose onto and off of
the pipe, you'll break it.  Install the hose onto the pipe holding the pipe
in your hand, then lay the spacer in position, and manhandle the other end
of the hose onto the pipe under the car.

Easy peasy!

In answer to your actual question, I have seen a number of Pantera owners
attempt to incorporate electric vacuum pumps, and every one of them was just
miserable.  Those are another 'race only' part, and are deafeningly loud and
create a ton of vibration.  I find them completely intolorable for a street
car, plus they take up a lot of precious front trunk space.  And they are
more expensive than the simple spacer shown above.

Mike



-------------- next part --------------
   Hi Mike,


   Yes, it is a high single plane manifold with no provision for vacuum; I
   was also told by engine builder that cam spec I got would not really
   provide a sufficient vacuum and I would be better off using the vacuum
   pump....

   I thought that there should be a good solution to be used on
   track/street car; aren't they various modern cars (in particular turbo
   diesel) that use electric vacuum pumps for this purpose?

   Would I need additional vacuum reservoir or not?

   Would be nice to find all-in-one solution that includes reservoir (if
   needed), pump and a vacuum controlled switch.


   Thanks, Robert


   From: MikeLDrew at aol.com [mailto:MikeLDrew at aol.com]
   Sent: Thursday, July 02, 2015 6:51 AM
   To: npdrs at maui.net; detomaso at poca.com
   Subject: Re: Brake vacuum source


   In a message dated 7/2/15 5 23 23, [1]npdrs at maui.net writes:

   Hello, I am just having new engine installed into my '71 and will no
   longer
   have a reliable source of vacuum available for the brake booster.
   Could someone please recommend a proven electric vacuum pump setup and
   where
   to buy it?
   It would be great if possible to find a source in Germany (or Europe)
   as the
   car is in Germany.

   >>>Robert--I assume the problem is that your new engine is fitted with
   a 'race' intake manifold that has no provisions for vacuum take-off?
   That's the problem with such things.
   One solution is to have a bung welded to one of the intake runners.
   When I faced the same problem with my GT350, I took a different path.
   I fitted a Boss 302 carb spacer, which has provisions for brake vacuum,
   yet is very thin to provide hood clearance.
   I got mine here:
   [2]http://www2.cougarpartscatalog.com/bossspace.html
   You could always just get a typical one-inch spacer, but that adds
   height that you don't want.  This spacer is very, very thin; the round
   pipe goes oval as it enters the side of the spacer, reducing height,
   yet the total area remains unchanged.
   [3]http://image1.cougparts.com/dc/16203/1430333053_l.jpg
   [4]http://image1.cougparts.com/dc/16203/1430333006_p.jpg
   [5]http://image1.cougparts.com/dc/16203/1430333005_g.jpg
   (Those are photos of a used original, not the new repro, which is built
   to the same standard but obviously looks new).
   Note that it is somewhat fragile; if you manhandle the hose onto and
   off of the pipe, you'll break it.  Install the hose onto the pipe
   holding the pipe in your hand, then lay the spacer in position, and
   manhandle the other end of the hose onto the pipe under the car.
   Easy peasy!
   In answer to your actual question, I have seen a number of Pantera
   owners attempt to incorporate electric vacuum pumps, and every one of
   them was just miserable.  Those are another 'race only' part, and are
   deafeningly loud and create a ton of vibration.  I find them completely
   intolorable for a street car, plus they take up a lot of precious front
   trunk space.  And they are more expensive than the simple spacer shown
   above.
   Mike

References

   1. mailto:npdrs at maui.net
   2. http://www2.cougarpartscatalog.com/bossspace.html
   3. http://image1.cougparts.com/dc/16203/1430333053_l.jpg
   4. http://image1.cougparts.com/dc/16203/1430333006_p.jpg
   5. http://image1.cougparts.com/dc/16203/1430333005_g.jpg