200ci PCV and vacuum advance off same manifold port?

[rrbc]

Can I run PCV and vacuum advance off same manifold port? Not sure if this is an option. Right now I have a breather cap on oil fill, pcv valve on rear of VC with a hose running to the air filter on my center carb. Running three weber 34's so no vacuum port on carbs, and no room to run a spacer.

Option A: Run as is
Option B: Tee at manifold port to run pcv and vacuum advance
Option C: Run breather caps on both ends of VC

Sorry for the newb questions but this car was gifted to us and trying to figure out best practices! Thanks in advance.

 

[awasson]

Can I run PCV and vacuum advance off same manifold port? Not sure if this is an option. Right now I have a breather cap on oil fill, pcv valve on rear of VC with a hose running to the air filter on my center carb. Running three weber 34's so no vacuum port on carbs, and no room to run a spacer.

Option A: Run as is
Option B: Tee at manifold port to run pcv and vacuum advance
Option C: Run breather caps on both ends of VC

Sorry for the newb questions but this car was gifted to us and trying to figure out best practices! Thanks in advance.

Yes. I’m running manifold vacuum to my HEI distributor and my PCV valve goes to a sealed catch can and the catch can goes to the same fitting. It has a barb for each sized hose.

 

[rrbc]

Yes. I’m running manifold vacuum to my HEI distributor and my PCV valve goes to a sealed catch can and the catch can goes to the same fitting. It has a barb for each sized hose.


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Ahh didn’t consider the catch can route… makes sense.

 

[awasson]

Hey… I just reread that. Tri-power, huh? Nice! I have been considering a tri-power for my new head build.

There are members here with tri-power setups and experience with them. After you’ve posted 5 times you’ll be able to post photos of your setup and I’m sure you’ll get any advice you need.

 

[rrbc]

Hey… I just reread that. Tri-power, huh? Nice! I have been considering a tri-power for my new head build.

There are members here with tri-power setups and experience with them. After you’ve posted 5 times you’ll be able to post photos of your setup and I’m sure you’ll get any advice you need.

Yeah…. And admittedly I’ve never been a guy who works on cars haha. My wife had this car in high school, sold it to her father and he spent the last 25 years building it out. He recently gifted it back to her (made good on his promise l) and now….. I’m learning. It’s pretty intimidating for me but just trying to get educated and improve/ expand on what he’s done, which is a lot!

 

[alwill923]

Right now I have a breather cap on oil fill, pcv valve on rear of VC with a hose running to the air filter on my center carb.

PCV must go to a vacuum source at the carbs NOT to the air filter. I am not familiar with weber carbs but there should be some way to accomplish this. I would split the PCV line to all carbs as just going to one would cause the air fuel ratio to be different at that carb. If the carbs are on a progressive linkage where the outside carbs are just for power and the center carb is used for cruising and idle then it would be ok to just run to just the center carb.

Think of a PCV as a controlled vacuum leak and will affect the air fuel ratio of a carb and the carb is adjusted for it. If a PCV is attached to a vacuum source in an intake runner that cylinder will run lean. You want the PCV vacuum source so the leak is distributed to all the cylinders. Running to the air cleaner does nothing. The air source being pulled in to the engine comes from the air filter.

PCV pulled crankcase fumes out of the engine. Air from the air filter lets air back in.