Power Brakes and Vacuum

Dan Fahey · 09-20-2021, 01:37 PM

Noticed that changing to the Stocker Cam from Pure Stocker.
Ran into two issues

Cannot hold the Converter as much on Launch.
Use to hold as much as 3200rpm.
Now barely launch above 2500rpm

The Line Lock will not hold the car during Burn Out.
Have to power brake to get the tires spinning.

Shut down after a run is no problem.

Is there a good solution to get more Vacuum Boost for the Power Brakes?

Terry Witzel · 09-20-2021, 04:46 PM

Quote:

Originally Posted by Dan Fahey

Noticed that changing to the Stocker Cam from Pure Stocker.
Ran into two issues

Cannot hold the Converter as much on Launch.
Use to hold as much as 3200rpm.
Now barely launch above 2500rpm

The Line Lock will not hold the car during Burn Out.
Have to power brake to get the tires spinning.

Shut down after a run is no problem.

Is there a good solution to get more Vacuum Boost for the Power Brakes?

Dan, years ago I used to run one of these, the price has really gone up.

https://www.summitracing.com/parts/c...+5ba2536e62314

Jim Whitehead · 09-20-2021, 05:12 PM

Electric vacuum booster.

Bob F · 09-20-2021, 06:24 PM

I’ve built vac canisters using 4” pvc tubing as reservoirs and they worked well on the street.

Tex013 · 09-20-2021, 06:43 PM

a vacuum pump is needed .
You can use the one out of a G8 Pontiac / Aust Holden
This : https://www.hella.co.nz/en/products/...pump-up28.html
or this : https://www.amazon.com/ACDelco-20804...ic+vacuum+pump
You can run full time , race only or switched
Like this : https://www.amazon.com/Superior-Univ...HSQKDHY2J27ZZ3

Tex

ss3011 · 09-20-2021, 11:10 PM

Remove the booster and switch to a manual master cylinder and save all the weight .

09-20-2021, 01:37 PM	#1
Dan Fahey VIP Member Join Date: Oct 2008 Posts: 2,126 Likes: 1,084 Liked 184 Times in 113 Posts	Power Brakes and Vacuum Noticed that changing to the Stocker Cam from Pure Stocker. Ran into two issues Cannot hold the Converter as much on Launch. Use to hold as much as 3200rpm. Now barely launch above 2500rpm The Line Lock will not hold the car during Burn Out. Have to power brake to get the tires spinning. Shut down after a run is no problem. Is there a good solution to get more Vacuum Boost for the Power Brakes?

09-20-2021, 05:12 PM	#3
Jim Whitehead Member Join Date: Mar 2003 Location: MA. Posts: 283 Likes: 148 Liked 147 Times in 39 Posts	Re: Power Brakes and Vacuum Electric vacuum booster.

09-20-2021, 06:24 PM	#4
Bob F Junior Member Join Date: Sep 2007 Location: Bucks Co Pa Posts: 73 Likes: 17 Liked 16 Times in 11 Posts	Re: Power Brakes and Vacuum I’ve built vac canisters using 4” pvc tubing as reservoirs and they worked well on the street.

09-20-2021, 06:43 PM	#5
Tex013 Junior Member Join Date: Oct 2012 Location: Sydney , Australia Posts: 96 Likes: 20 Liked 42 Times in 24 Posts	Re: Power Brakes and Vacuum a vacuum pump is needed . You can use the one out of a G8 Pontiac / Aust Holden This : https://www.hella.co.nz/en/products/...pump-up28.html or this : https://www.amazon.com/ACDelco-20804...ic+vacuum+pump You can run full time , race only or switched Like this : https://www.amazon.com/Superior-Univ...HSQKDHY2J27ZZ3 Tex

09-20-2021, 11:10 PM	#6
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 903 Likes: 68 Liked 237 Times in 112 Posts	Re: Power Brakes and Vacuum Remove the booster and switch to a manual master cylinder and save all the weight .