5.0 EFI PCV System solution.

[ba123]

I spent too much time figuring out what would work for my own Pcv setup. The BXR manifold gives you zero clearance and wants you to put a lame s hose on the stock cover and I came up with this instead. I don’t think I even have the stock covers anymore.





The possibilities are endless with this method I would this but this is the one I went with and hope it helps someone.

The cap I got from Amazon but is EV ails me many places. Same with the fitting.

PRW 4120453 cap
ICT Billet -6an to 5/16” barbed hose fitting.
After test fitting everything including the clearance for the baffle plate, I cut a hole with a hole saw in the cover and used the permanent picture on the threads and lock screw.

I did try to tap the hole in the cap and it worked but my tap did not go in perfectly straight so I wasn’t happy with it and made it a hole instead as I feel I’ll get a better deal that way.

 

[ba123]

And one more pic to show how tight of a fit this is.


And if I use the other plenums there will be even less space.

 

[DirtDonk]

Slick enough to start many a good conversation I'd say!
But where does the engine now have the actual PCV valve? Is it still in the intake manifold like factory, or is it going to have to be mounted in a valve cover as well?

Paul

 

[ba123]

Pcv valve is in the intake like factory. On the BXR, it’s in the back near the firewall on the intake. This replaces inlet from the throttle body to the oil fill neck.

So, technically, it’s exactly the same as stock but without a big ugly thing sticking out that wouldn’t really fit anyway.

Here:

 

[DirtDonk]

Just to come back to this (since you did actually bring it up! ) you still need an inlet.
Has to be somewhere.
The PCV valve provides the controlled suckage, and the clean air has to come from somewhere.
That’s usually the job of the attachment to the inlet tract and valve cover.
You don’t connect that oil filler fitting on the valve cover to anything behind the throttle blade, you connect it in front of it. Anywhere from just in front of the throttle blade, where the factory puts it quite often, all the way up to just behind the MAF.

So that’s where the clean, fully filtered air gets back into the engine. Now I’ll go back to the other thread that you linked this too.

 

[Broncobowsher]

Sounds like you made a fresh air inlet. I don't see a baffle. Which I see as a problem. While technically it is pulling fresh air in, under high load it will push blowby out as that is the path of least resistance. I would expect some oil mist exiting that port.

 

[ba123]

Mine is correct, I just misspoke in that other thread. My PCV on the BXR intake is in the rear of the intake like shown above and here is the TB side:

 

[ba123]

Sounds like you made a fresh air inlet. I don't see a baffle. Which I see as a problem. While technically it is pulling fresh air in, under high load it will push blowby out as that is the path of least resistance. I would expect some oil mist exiting that port.

I hadn’t put the baffle on yet but it’s there.

 

[DirtDonk]

 

[rjrobin2002]

Send that intake off to China and let them start reproduction. I want one.

 

[ba123]

Was not easy to get it done on the Bronco how I wanted it but it’s good. Just wish I’d stop having to deal with other things.

 

[nvrstuk]

So does your cap screw in from both sides to seal against the valve cover, then you bought something else for your hose barb to fit onto it? Just not following from the pics I guess as the part # you posted came up with a black anodized cap setup and yours in the pic is alum

 

[ba123]

I wrote it above but meant to link and looks like autocorrect messed up a bunch of what I wrote.

PRW 4120453 Valve Cover Kit https://www.amazon.com/dp/B004L2P1WU/?tag=classicbroncos-20

I drilled a hole for this cap in the valve cover, which is a bulkhead cap that screws on each side and seals or you can weld it. I used permanent thread lock I think.

Then I drilled a hole through the cap for the bulkhead hose barb fitting.

 

[ba123]

The black might have come up cause it’s out of stock on Amazon but there is the mf:
https://www.prwpower.com/prw-valve-cover-accessories-4120453--4120453/p3819

 

[nvrstuk]

Thanks, checked them both out. I still need to redo my PCV setup and put a much larger fresh air line on my return line.

 

[DirtDonk]

The original clean air lines were larger.
The early PCV hoses to the valve looked quite large, but they were molded from the factory, and the inside diameter was essentially 3/8 inch at the valve and a little larger at the carburetor spacer.
The return air from the middle of the air filter housing to the valve cover was larger to fit whatever size those 45° plastic elbows are.
5/8 inch maybe?

 

[nvrstuk]

Yeah, I've been told by a couple tuners and then verified that large cu in engines in theory should have 3/4-1" hoses. Did some looking and back in the day when we all had to move from breathable to the atmosphere valve covers to PCV and "fresh" air return lines that some big blocks came with 7/8" hose (ID of course).

 

[ba123]

Yeah, I did do a reducer on hose from the stock 3/8” on the throttle body to a 5/16” OD hose on the valve cover.

I might look at changing that. Don’t remember why I did it that way. Maybe that’s the only fitting I could find but could just do a barbed NPT or NPS fitting through the cap and a nut instead of what I used for that part.

 

[ba123]

Looks like there are some other fitting like this one for the barb bulkhead fitting:
https://www.amazon.com/dp/B0C1MZ2HGT/?tag=classicbroncos-20

 

[ntsqd]

-8AN breather hose on a whopping 170 c.i. engine, I considered -6 to be too small for the fresh air. The PCV side got 3/8" tubing and hose.