Author Topic: Cam and power brakes  (Read 874 times)

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Jb427

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Cam and power brakes
« on: September 10, 2020, 12:33:05 PM »
I am looking for some info on if i need to look at a vacuum pump or if just a vacuum tank may work for my power brakes. Engine is 482 bbm 8v intake i have 2 camshafts first one is 288 294 258 264 .696 .696 110° i dont have the specs of the second camshaft on hand but it is has more lift 700+ but the rest of the specs are really close to the same.

I have not had time to share my build. Here is a quick pic of the new paint.
 

blykins

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Re: Cam and power brakes
« Reply #1 on: September 10, 2020, 12:35:48 PM »
67° of overlap will run power brakes adequately, with about 14 inches of vacuum. 

Your first cam has 71°. 

I think vacuum would be marginal with it.  Easiest way is to just add a vacuum reservoir.
Brent Lykins
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Jb427

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Re: Cam and power brakes
« Reply #2 on: September 10, 2020, 12:40:51 PM »
Thanks Brent I was hoping just a vacuum tank would work.

1968galaxie

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Re: Cam and power brakes
« Reply #3 on: September 10, 2020, 02:00:45 PM »
Vacuum tanks work very well.
My 68 Galaxie with hidden headlights has a factory vacuum tank.
Works very well with 95 degrees overlap (advertised duration@0.020")
502" certainly makes idle vacuum better as well as a much modified dominator and 24 degrees initial advance.

Cheers