|
Joined: Aug 2012
Posts: 166
Contributor
|
OP
Contributor
Joined: Aug 2012
Posts: 166 |
Hey guys Ive been chasing some brake/booster issues on my truck. I was wondering if anyone knows how much vacuum Tom's 292 cam should pull at the intake manifold port for the booster. Don't want to go buy a guage if I know thats no the problem. Motor is lumped, 40 over, balanced, Clifford intake, etc.etc.
|
|
|
|
Joined: Jan 2005
Posts: 2,123 Likes: 3
1000 Post Club
|
1000 Post Club
Joined: Jan 2005
Posts: 2,123 Likes: 3 |
Tom's 292 cam, which is what? How much idle spark do you have?
|
|
|
|
Joined: Apr 2004
Posts: 3,556 Likes: 35
1000 Post Club
|
1000 Post Club
Joined: Apr 2004
Posts: 3,556 Likes: 35 |
Stan, Which cam? I offer a few. Most of them offer decent vacuum at idle. A vac gauge is a cheap tool.
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com
|
|
|
|
Joined: Jan 2005
Posts: 2,123 Likes: 3
1000 Post Club
|
1000 Post Club
Joined: Jan 2005
Posts: 2,123 Likes: 3 |
If the cam is hot enough that idle vacuum is low (despite best ignition setting) an easy partial fix is a vacuum storage tank, simply an empty air-tight can connected between the manifold and booster with a check valve. No sizes, no adjustments, just hook it up. The can re-charges to highest vacuum available whenever the engine supplies it (cruising, trailing throttle). It allows several power-assisted low effort stops (instead of just one) in traffic. I used the Chrysler slant 6 can many times, the Summit/Jeg's is $$. I've seen them made from all sorts of containers (2 quart tomato juice) that will hold vacuum and can have 2 fittings securely attached. The bigger the better but mount it close to the manifold using the same hose size as the booster.
|
|
|
|
Joined: Aug 2012
Posts: 166
Contributor
|
OP
Contributor
Joined: Aug 2012
Posts: 166 |
Stan, Which cam? I offer a few. Most of them offer decent vacuum at idle. A vac gauge is a cheap tool. Sorry Tom I can't remember which cam I bought. In fact it was probably 6 years ago. If I remember corectly I think you were only offering 1 at the time for a 292. i would have to go ack and look through my paper work. I'm not even sure my problem is low vacuum. I have a good pedal until I start the engine. Then my pedal goes sloppy. I would think if I didn't have enough vacuum my pedal would stay firm. Oh, What is idle spark?????? do you mean timming?????
|
|
|
|
Joined: Jan 2005
Posts: 2,123 Likes: 3
1000 Post Club
|
1000 Post Club
Joined: Jan 2005
Posts: 2,123 Likes: 3 |
Initial spark, where the plug fires at cranking speed.
|
|
|
|
Joined: Jun 2019
Posts: 2
Newcomer
|
Newcomer
Joined: Jun 2019
Posts: 2 |
In my experience it is quite common for a vacuum booster brake system to have the pedal feel a bit soft after engine startup..that is, think, an indication the booster is working.
|
|
|
|
|