. Oil Catch Cans

[Mosesatm]

Have any of you used an oil catch can on your classic car?
They install between the PCV valve and the carb, and catch the blow-by oil before it goes back into the cylinders.

 

[Ruppstang]

What is the purpose of that?

 

[franklinair]

I've seen them on aircooled aircraft engines, but never automotive. Called an air/oil separator.

Neil

 

[Mosesatm]

What is the purpose of that?

They are used on cars with direct injection to keep oil from caking the backside of the valves. They aren’t really needed on our cars because the fuel flowing past the intake valves washes the valves and keeps them somewhat clean. I’d use one just to not burn all that oil.