FE Power Forums

FE Power Forums => FE Technical Forum => Topic started by: Jb427 on September 10, 2020, 12:33:05 PM

Title: Cam and power brakes
Post by: Jb427 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.
 

Title: Re: Cam and power brakes
Post by: blykins 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.

Title: Re: Cam and power brakes
Post by: Jb427 on September 10, 2020, 12:40:51 PM

Thanks Brent I was hoping just a vacuum tank would work.

Title: Re: Cam and power brakes
Post by: 1968galaxie 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