Home Made PCV system

[Robert Legner]

I have an 8BA and want to put in a home made PCV system. There has been descriptions of the parts needed. Can someone repeat the parts needed. Thanks in advance. RFL

[petehoovie]

You can buy this simple kit from JAMCO > https://jamcosuspension.com/products...productID/1504

PCV4953
1949-53 FORD & MERCURY FLATHEAD PCV VALVE KIT



$39.95


1949-53 Ford and Mercury flathead V-8 PCV valve kit replaces the original vent tube with a modern "PCV" valve. It will eliminate blow by smoke and keep condensation out of the crankcase.

[GordonC]

Robert I made my own. Got a freeze plug the size of the hole where the road draft tube goes. Got a PCV valve for a 3800 Buick v6 I think. Then drilled a hole in the freeze plug to accommodate a rubber push in type gasket for the PCV valve. Drove the freeze plug into the road draft hole, stuck the PCV into it, and then plumbed it to a port on the intake manifold with some vacuum line. Not hard to do really.

[51504bat]

I made one for the 8ba in my p/u. I used a Dorman grommet and a PCV valve from a Buick V6. I think I have the part numbers in the shop. I'll look and post them tomorrow with some photos. Easy to do.

[51504bat]

Found some photos.

[4t8v8]

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Did mine the same as 51504bat. Works great.

[markdtn]

Mine is similar to above. The vacuum port just below the carb on an iron 8BA intake uses 7/16 banjo threads. I bought a GM disc brake 7/16 banjo bolt (and drilled it to a larger ID and drilled an extra hole) and a 7/16 banjo to 3/8 hose barb fitting (AKA 12mm banjo x 10mm barb) off Ebay. I am using a Motorcraft EV68 PCV valve and a Dorman/Help 42052 Grommet in the road draft tube hole.

[51504bat]

Part numbers for what I used. Grommet - Dorman/Help 42322.
PCV valve - Standard V261 from a Buick V6. I was told that you should use a PCV valve from a similar displacement engine. Don't know how true that is or not but the Buick and the 239 Flathead were very close IIRC. The manifold I used already had a fitting that I hooked the PCV valve hose to (in addition to the fitting for the vacuum wipers) Hope this helps.

[12cliff23]

hey 51504bat where did you get the cool choke cable?

[51504bat]

Originally Posted by 12cliff23

hey 51504bat where did you get the cool choke cable?

Came with the truck.

[Robert Legner]

Thank you guys, then the next question is does the vacuum decrease when the plumbing is attached below the carb? I tried the manufactured type and the vacuum decreased by almost half. Restoring the road tube draft pipe brought it back. But I still do not like the fumes. You comments please!

[51 MERC-CT]

Delete

[alanwoodieman]

if you do not allow some outside air into the engine the PCV will not work. I had the same vacuum question until I put a breather cap back on the fill tube

[chiefdave]

I found this on the Adujag web site for $11.20 plus shipping. For '49-'53 Ford/Merc. Now, what is the advantage of doing away with the road draft tube?

[lonewolf]

What is the adujag website?

[V8COOPMAN]

Originally Posted by chiefdave

Now, what is the advantage of doing away with the road draft tube?

The road draft tube IS the "vent" for an 8BA crankcase. It's the venue for pressure to escape the crankcase. As the vehicle increases speed, the open end of the tube going through the air beneath the vehicle produces SOME degree of suction to help vapors escape to the atmosphere. The PCV Valve being mounted in place of the tube allows the MANIFOLD vacuum to put a positive "suck" on the crankcase.

PCV Valves must be connected to "MANIFOLD" Vacuum. Below is a diagram of how a stock 8BA's crankcase venting/purging is designed to take place. DD

[Fortunateson]

Those are some good suggestions. But I thought you had to plumb a line under the intake manifold?

[V8COOPMAN]

Originally Posted by Fortunateson

Those are some good suggestions. But I thought you had to plumb a line under the intake manifold?

Hey Fortunate .....I've gone and looked at your previous posts, and I THINK I've determined that you have an 8BA-type of flathead...is that correct? The early ('32-'48) flatheads "breathe" and vent differently than the 8BA-type ('49-'53), so it makes a difference in how your PCV system is set-up.

To answer your question about plumbing a line UNDER the intake manifold.....that is a pretty broad question, and the 'routing' would depend on several factors. Yes, we have all seen plumbing AND PCV Valves themselves mounted under the intake manifold, some examples shown below.







We see all kinds, and there's one pictured above that I still can't figure-out how it operates. Another thing seen herein is the PCV Valve mounted HORIZONTALLY. MOST PCV Valves are designed to be operated in a VERTICAL position. And, some flathead Ford engines are assembled using a mix of the "Early/Late" block and intake manifold, which brings it's own set of circumstances into the picture. So, just by having a line plumbed "under the manifold" doesn't mean that it's necessarily a good thing...or a bad thing.

The system that Heard and I designed/assembled has it's own unique set of circumstances, which EVERY flathead PCV system will have it's own unique circumstances to design for. Our system involves an 8BA block (late), with a Thickstun PM-7 manifold (early). On top of that, we decided that we wanted to hide that ugly PCV Valve and to keep any associated plumbing as pleasant looking as possible. We ALSO did not want to have to remove the manifold to access the PCV Valve, keeping in mind that the valve should remain vertical to function properly. Click on the link BELOW for the full story, lots of facts and theory, as well as many pictures, and of course....a parts list. Hopefully this will help you! DD


https://www.fordbarn.com/forum/showt...a%2C+pcv+valve



........

[Fortunateson]

Thanks DD. I've put my 8BA on hold until the border reopens as the fees to have the parts I need shipped into Canada are a wee bit steep. I'll be back on it as soon as the border reopens though. I go over the link and see what's what. I have a goal of getting my '32 5W over to Victoria for the Morthwest Deuce Days next summer....


Edit: Just tried to open that link and a Error 404 showed up, "not found"?

[V8COOPMAN]

Originally Posted by Fortunateson

Thanks DD.


Edit: Just tried to open that link and a Error 404 showed up, "not found"?

I'm sorry about that....not sure how I screwed that one up. The link works NOW! DD