Crankcase Hose

My 69 Dauntless has a fitting at the bottom of the carb that connects a hose to the valve cover. I suspect it is a crankcase vacume line. In Calif. My CJ is exempt from smog rules and I'm thinking of just plugging the carb fitting and putting on a breather for the air cleaner.
Any reason you can think of I shouldn't?

 

I don't know about the V6 specifically, but the PCV system on V engines will have a clean air intake (usually from the air cleaner housing) with a hose to the valve cover, and a return hose from the manifold grommet with the PCV valve to manifold vacuum (base of the carburetor). I'd suggest you keep it stock, since it doesn't cost you anything in performance, very little in maintenance (clean the valve, check the hoses), vents the crankcase, and keeps dirt out of the crankcase.

 

There is no hose from the aircleaner. The aircleaner is an after market race version.

 

O.K. Here it is. When running with a vent versus a crankcase evacuationg system you have 6 or 7 pound of atmospheric pressure to overcome. If you have a way to evacuate the crankcase, you are less likely to have blow by caused by higher pressures in the crankcase.On higher performance engines and I installed a check valve in the headers with a hose to the pcv valves to cause a venturi effect just to keep those pressures out of the crankcase. I recommend using the system as designed, it will benifit you in the long run

 

That PCV system also pulls a lot of the blowby and oil coking out of the engine and burns it helping to keep the inside of the engine cleaner, all that carbon WILL buil up inside the valve covers and stay there if you disable it... I have seen the effects of this and it ain't perty...

BUBBA

 

I've seen aftermarket crankcase intake filters here at Autozone that take the place of the filtered air source from the air cleaner. They even come in colors (bling!). No need to tap into the air cleaner - use a stand-alone filter and the stock PCV valve & hose and you should be all set.

 

I guess it is unanymous. Keep it on. I grew up in my hot rod days when there was nothing like that and wasn't sure what it did. Then all smog stuff was bad and we took it off. Sounds like this old dog needs to learn some new tricks.

 

as Tim mentioned, it will work; what I run on mine
parts store have K-N type push in filters; they have a built in grommet on them and pop in the hole in the valve cover;
measure the hole diam in the valve cover; some seem to be odd size; I had to weld a washer over my factory hole to get the correct ID for the filter
ymmv

 

It wont kill the motor or anything, just doesnt help anything not pulling that extra pressure away from the crankcase.