Another PCV question

Does a PCV valve have to be vertical,or near vertical to function properly,or can it be horizontal?????

 

Up, down, left or right, it don't matter, just so long as it's getting vacuum from the correct end if it's an inline type. There's a spring inside.

 

Most American iron will work best vertical (i.e.= chev, ford, mopar) but some import will mount horizontal.

 

I know some guys who stuck them in the back side of their valve covers on American Iron...Had finned valve covers and did not want to destroy the fins...worked for them...

 

Hey Gary,
When do you get that engine back from the machine shop?

 

Its back---waiting for valve spring now

 

can u mount it coming out of the carb and back into the air cleaner rather than a valve cover at all???

 

i do have a stock 307 2 barrel with no holes in the covers...ive seen it come out of the air cleaner to the valve cover so why not go out from the carb and put pvc into the air cleaner?
...i do have a screen on the front oil fill as well...

 

You lost me . That is, what your saying is no good. The PCV pulls crankcase vapors (air if you like) out of the engine. So to have it in the air cleaner wrong. Now the mesh you see in the air cleaner is part of one type of system to allow fresh air back in the crankcase via the back of the block on early SBC for example or the valve cover since the PCV is pulling air/vapors out of the block.

 

NO! that will not work in the least. The Positive Crankcase Ventilation Valve is used to ventilate the crank case not the air cleaner.

You have to have air into the crankcase somewhere that is hopefully clean and the pcv works to draw it and the fumes and pressure out of the crankcase.

 

The hose/tub comes out of the aircleaner to the valve cover so that the engine will get clean air drawn though it. The PCV draws it through and into the intake.

 

Some can some can't. The early ones used the weight of the pintle to close the valve. The vacuum lifted the pintle and gravity closed the valve. They need to be vertical. They were pretty easy to tell...they rattled when shaken because the pintle is loose inside. When mounted horizontally it would just lie on it's side in the housing and not close down under load.


The ones made for horizontal use are spring loaded to close the valve when the vacuum falls.


Some are made to screw right into the carb base so they will work well horizontally.

The systems that have a hose connected to the aircleaners are called closed systems. Under a long heavy load like going up a mountain the blow by backs up into the aircleaner where the excess is sucked into the carb but under normal usage that is the intake for the air and the flow is in the other direction.



This filter is to keep the dirt out of the oil when under normal circumstances this is where the air enters the engine crankcase. If the air was always flowing from the crankcase into the aircleaner there would be no need for this filter.



This is the one that I use on Rochester 2 bbls.