weber carbs-fitting for power brakes

[proporsche]

Hi girl+boys ..anyone has done this?I have here 1978 911SC with Webers..This car has all the power brake equipment in ,it just have to have the air suction on the intake done.Has anybody done this job?
I am guessing it will not take any power away from the carbs....so, just asking for some info about it...
thanx

Ivan

make a nice threaded hole in here for the fitting? Of course on no.3

[Jack Stands]

The early manifolds had vacuum ports that allowed you to get engine vacuum. My 914-6 has taps on the two outer manifold runners that have vacuum lines connected to get a signal.

[Jack Stands]

The vacuum lines are removed in the photo, but you can see where they attach. Both lines were connected with a T fitting that then provided a balanced vacuum source with decreased pulsing if there was only one tapped source.

[juanbenae]

I tapped a single line off the middle intake on the driver side manifold w/o any ill effects on my old spec911 with 46mm PMO's.

[Ayles]

I went with a high end vacuum pump designed for electric cars. Not an inexpensive route but it’s quiet and works well.

[proporsche]

thanx guys for the ideas....

Jack.. i will look for the fitting it is a little different what i am facing...

Juan.. i`ll try that if not ok i do the T fitting spit

Ivan

[john walker's workshop]

I've used a sporto vacuum tank so you don't run out of vacuum after multiple pumps of the pedal, and a vacuum pump in the smuggler box once. It was kind of noisy, but I'm sure there are quiet ones.

[3rd_gear_Ted]

Just a related question.
Does a check valve need to be installed to assure proper brake boost operation ALL the time???
Is this a design consideration for both ITB's and Carb conversions?

[proporsche]

Thanx John.....
Ivan