Tii Booster orientation, does it matter where vacuum port is

[man_mark_7]

Hi All,

 

Moving forward with Tii brake booster install in my base model 1973 to give clearance for dual 40 DCOEs. I noticed that, when mounted in a Tii, the vacuum port is positioned at the bottom of the booster. I can't think of any reason why it has to be this way. Am I missing something? Does anyone have a suggestion for orienting the booster to make running the vacuum hose to the manifold easiest and/or cleanest looking? I'm using an IE manifold. When mounted, the brass fitting will be pointing back at the firewall. I was going to replace this with a 90 degree elbow to give the hose a fighting chance of not kinking when being routed to the much-further-forward Tii booster vacuum port.

 

 

thanks in advance!

Mark

[visionaut]

Mark - if you use the proper steel-reinforced brake booster hose it will not kink, or collapse under vacuum. And you need to also factor in the needed one-way vacuum valve placement in the hose’s routing to the booster. The booster hose routes down under the sidedraughts, pretty much out of sight, on mine.

 

I have no idea of it’s possible to mount the booster can differently to try to shorten the run length of the vacuum hose. Your 90deg barb swap idea looks like it might be a good way to eliminate that immediate 180deg turn in the hose at the firewall.

 

Tom

[Mike G]

You can mount it upside down. That’s how mine is although I’ll be swapping it the other way around soon. 

[man_mark_7]

Thanks @visionaut & @Mike G. I think I answered my own question. Since there are only two studs for the master cylinder to mount onto the booster, the port can only be at the top, or at the bottom. When I tried to mount the booster with the vacuum port up, it was obvious that the elbow that feeds the master cylinder from the reservoir was going to interfere with the port. In other words, unless you are willing to do some non-obvious mods, the vacuum port needs to be at the bottom.

 

m