Flathead vacuum?
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Junior User
Joined: Aug 2009
Posts: 92
Likes: 0
From: Spring Branch, Texas
Flathead vacuum?
As I'm contemplating the direction of my build, I will be doing the disc conversion for the front brakes. My question is what is the average vacuum that a flatty pulls? I know cam and other mods affect it but will a slightly modded flathead provide enough vacuum for a power brake booster?
I rememeber when I drove this thing 20+ years ago it barely provided enough for the wipers to work. (may have had a vacuum leak though)
I rememeber when I drove this thing 20+ years ago it barely provided enough for the wipers to work. (may have had a vacuum leak though)
Senior User
Joined: Nov 2004
Posts: 168
Likes: 1
From: Centrl San Joaquin Valley
Vac pump
You can find a nice small pump at Summit and then you won't need to worry, which is what I did for my '48 F1. I'm spending more money than I should and the last thing you need to worry about is, Will this damned thing stop when I need to. The engine is bored and stroked with a big cam, lots of Carbs and everything else I could think of. The front end has a dropped axle with power disc brakes so I figured what the heck, why not.
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Another thing to consider here is that the brake booster itself acts as its own reservoir and it always has a check valve. Go out and start up your daily, let it run for a sec, and then shut it off. Now step on the brakes a few times. You'll get at least two or three good vacuum-assisted pushes before the pedal goes hard.
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