All Small Six Weber 32/36 rough idle

[beanmiester]

I should also add my fan is on for the vast majority of the time because I have it set to kick on at 160 because at 170 or 180 it gets way too close to overheating for my liking since it takes a bit to actually cool

 

[awasson]

I should also add my fan is on for the vast majority of the time because I have it set to kick on at 160 because at 170 or 180 it gets way too close to overheating for my liking since it takes a bit to actually cool

When I was trying to get mine to work, I put my fan relay on a switch. Even running full time, I couldn’t keep the carb from Vapour locking. That was without a phenolic spacer and without a heat shield between the carb and engine and with my gas line basically on the valve cover. My engine compartment is ridiculously hot but blowing hot air around the engine compartment was just enough to keep it from Vapour locking.

It’s better now that I’ve rerouted my fuel line but I need to install the spacer and head shields before I attempt the electric fan again.

 

[DON]

I would think ( as mentioned by others )the electric fuel pump and a return line to the tank would be an excellent fix for vapor loc. insulate feed line and carb base and heat shouldn’t be a problem

 

[Frank]

So for for now I'm trying to figure out the vacuum situation that way my booster isnt gets crank case fumes

That and why you have oil in the filter housing. I laid out the PCV system in post 169. Is yours correct? If there's oil in the filter housing it is not correct. Either the PCV valve is not functioning correctly, not routed properly, or the engine is very worn out. Oil in the air filter means a large % of the blow by is going up that hose into the filter, which should only be occurring on heavy throttle.
Getting this straight is more important than the shared vacuum port at this point.
A picture of your system would be helpful.

Also, nearly all carbs have a intake vacuum port on them, this could supply the trans.

On my intake with no vacuum port, I used a spacer with a port in it for PCV.

 

[beanmiester]

The line that ties into the blue metal line is how the vacuum is routed. Under the metal support is a tee that connects to the transmission.
I dont have a line that goes into the air cleaner and I don't see anywhere to hook one up to.

 

[Frank]

View attachment 26591
The line that ties into the blue metal line is how the vacuum is routed. Under the metal support is a tee that connects to the transmission.
I dont have a line that goes into the air cleaner and I don't see anywhere to hook one up to.

Dang it, I'm confusing threads again- my bad. Thanks for the pic. That Tee where the PCV comes in is in the worst possible place, oil can run directly into the booster. The Tee should be at /in the intake, with the PCV going straight into the intake, and the other vacuum sources coming in from above. A Tee that threads directly into the intake provides the best flow.
It's obvious you have an attractive planned-out engine bay. Looks nice. Rerouting the lines may not look as nice. I have spent hours on end routing electric lines and hoses for a clean look, so I get it.

 

[Frank]

The intake nipple can be rotated the other way to run everything toward the rear below the carb. A Tee would fit in place of the manifold fitting there now also.