vacuum line into manifold for booster?

[jimmybeus]

Howdy all. I was at a car show today and noticed a few of the cars and trucks had the vacuum lines from the brake booster ran directly into the port on the back of the manifold instead of the carb. Would this give better brakes or be beneficial in some way? I am wondering this because at idle and lower rpms my brakes are stiff and require some effort to work, but at higher rpms they work like they should. I know that the more aggressive the cam is the the less vacuum there will be. Any thoughts? Thanks.

[nbpro]

may not be the answer you're looking for, but the search function at the top of the page yields quite a few answers.

http://www.google.com/custom?domains...D%3A1%3B&hl=en

[cableguy0]

Its just a matter of available ports. It wont matter so long as both ports used are below the throttle blades. IN the case of the 3/8's nipple on the carb its always below the throttle blades and will always be full manifold. If you have a bigger cam your not going to make much vacuum at idle. You can add a vacuum storage can which will help a good bit but changing ports isnt going to help you in your case.

[jimmybeus]

Wow. I read those posts and all though they are full of information I am finding there is a lot to learn. I do appreciate this forum and all the help everyone shares. I have learned a lot and love learning more. So what I am understanding here is the ports on my carb (Edelbrock 1406) and the port in my manifold (Edelbrock Torker 2) will produce the same results. I would really like to understand the vacuum advance and all the stuff in those posts, but I think I need to find the ones that are written with crayons and pictures.

Where can I find a vacuum storage can and what all it would consist of to install?

I'm not sure that what I'm writing here is explaining what I'm thinking, anyone else had that problem?

Thanks for the info now its time to start studying!

[cableguy0]

easy questions with relatively simple answers. There are two forms of vacuum 1 is full manifold and the other is ported. Full manifold is anything under the throttle blade on the carb whether its a port on the carb itself or the intake manifold.
Vacuum advance is completely seperate from what your talking about. Vacuum advance is part of the distributor. There are 2 forms of advance on being mechanical (the springs and weights under the rotor control this) and vacuum which is controlled by the can hanging off the side of the distributor. A high amount of vacuum adds advance low vacuum adds advance.
The vacuum can is available from multiple places but heres the first one i found quick http://www.summitracing.com/parts/CCA-5200/

[jimmybeus]

Thanks cableguy0 that helps. Would that canister be the easiest way to get better brakes with the setup I have?

[cableguy0]

Lets start over here. What size cam is in the truck? Its also possible that the booster could be going bad. More info and I can answer your question.

[jimmybeus]

Well thats kind of my problem. When I bought the motor from the builder he was shootin off so many different numbers that I cant remember what came he said was in it. It's not a real radical lope but you can tell there's something more than stock in it. I know that doesn't help but I will try to get a hold of him Monday and get the specifics.
Another question: would that vacuum advance have anything to do with the way it starts running at higher altitudes or is that all in the carb? What happened was I went up in the mountains and the higher I got the worse it started running. I went to turn around and it sputtered and died. It took some cranking and holding it wide open before it fired. I got turned around and headin back down the mountain. The more I went the more it started running normal.
We are sitting about 6700' in elevation and so I am wondering if I need a high altitude jet kit or something. Any ideas there? Thanks

[cableguy0]

Its very hard to compensate for harsh altitude changes with a carb. Other than physically getting out and rejetting the carb when you get to higher elevations theres not a lot you can do. Modern fuel injection will compensate but the carburetor cannot. Too much change in altitude will dictate a change in jetting. The issue gets worse the higher you go. The thinner the air gets the richer the engine will run and other than changing jetting theres nothing you can do about it with a carb.
As far as the brakes go you need to get a vacuum gauge on the engine and see what it has at idle. If your in the neighborhood of 15 inches of vacuum the brakes should work fine. Its hard to give you a definate answer without more info on it though.