PCV valves

[RobRobitaille]

Is anyone running a Pcv valve instead of a blow by tube? I found this piece in my pile of collected parts. If so do you have a part number of the Pcv valve you use and do you plumb it to the vacuum port in the intake under the carburetor?

[bkahler]

I installed a PCV system on my 51 218.  I used a Fram FV333 PCV bought on ebay.

 

Here's a link to my PCV installation,

 

 

[bkahler]

It's not very clear in my write-up but there are two pieces to the puzzle.  The first is the PCV valve from the crankcase to the intake manifold and the second is from the oil filler tube to the clean side of the air filter housing.  The crankcase needs fresh air in when air is being sucked out by the intake manifold.

 

Brad

 

 

 

[RobRobitaille]

Thank you I missed the clean air inlet part. I assumed you had a venting oil cap

[bkahler]

I used to have a vented oil cap but I sealed the cap off by using a sheet of rubber up inside the cap so air can't be drawn in through the cap itself.  I forget the reason why sealing the cap is the preferred method but every example I came across always had the cap sealed off and an air tube from the oil filler tube up to the clean air side of the air cleaner.

 

Here's some detailed information on adding a PCV system by Dodge.  

[kencombs]

Another commonly available PCV valve that works well in retrofit systems is the early Chevy that has a 1/4" pipe thread to attach to the manifold   Very similar that bkahler pictured.

[PT81PlymouthPickup]

I retrofitted a PCV system from a NOS 1960s 230 cubic inch military engine. The first photo shows how it came from the factory. AC CV-698C was the valve used. The valve has 1/4" NPT male and female on opposite ends. Plumbing from where my downdraft tube was using the same fitting in your photo to the intake was a fairly easy job, but I had to fabricate an adapter for the clean air intake and bend up a tube. I Purchased an oil fill tube with threaded boss from Vintage Power Wagons. I think I have an extra one if anybody wants it? The project was a little challenging, but has worked perfectly. No more stinking oil fumes and less oil seepage around seals. I believe the oil stays cleaner as well? To do something like this you'll need access to a tube bender and a flaring tool and some fittings. There may be an easier way to connect to your air cleaner, but I couldn't figure a way I liked, so being a machinist, I made the adapter from a piece of heavy-wall brass tube.

[RobRobitaille]

Both of your setups are nice and clean! I checked out the vintage power wagon site. Lots of good stuff. Pricing seams fair too!

Edited August 24, 2023 by RobRobitaille

[lostviking]

I bought the kit from Vintage Power Wagons. It comes with the PCV valve, so it's the whole kit. This is, I believe, the same upgrade the military used on their trucks.