Upgrade to PCV valve in a '63 144...

[Anonymous]

Today I went to the parts store a found a PCV valve with a 90* bend for the vacuum nipple and a rubber grommet type of thing to insert it snugly into the filter that is on my engine in place of a road draft tube (weird, but that's how mine came apparently). I put a NPT threaded nipple on my carb spacer and use that for the source for the PCV.

I had to lower my idle set screw and richen up the idle mixture screw to get the engine running smoothyl again, but it still is not perfect. It's not quite as smooth as it was before. If I turn the idle mixture screw much richer it runs rough, and much leaner it runs rough. It's adjusted for highest/smoothest idle.

Perhaps that PCV valve allows too much unmetered air into the engine (since it's such a small engine). Is there a specific PCV valve (part number?) that I should use for this engine?

Well the good thing is that the engine no longer smokes. Well worth the $5 or $10 I spent on the parts.

 

[addo]

Just wondering aloud... Would it make any difference if the breathable cap was replaced with a solid one, and PCV made a "loop" with two inputs to the valve cover, like many other engines? (One as you have it hooked up, and one from inside the air cleaner, feeding the valve cover.) The slight suction on the air cleaner side might reduce flow marginally.

Regards, Adam.

 

[XFlow_Fairlane]

hmm I never had any problems with mine... I was running a push in PCV on the cover to the carb spacer and sucking air in the road draft tube

 

['61 Draggin Wagon]

Originally, if your car came with a pcv valve(not all did in the early years), there was a metal elbow that pressed into the hole where the road draft tube was installed. Then a rubber hose went to the metal pcv valve. Which was screwed into a metal elbow, that screwed into the intake. It used a vented oil fill cap.
Darryl