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Kirkham Motorsports

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  #1 (permalink)  
Old 08-11-2022, 01:47 PM
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Default Weber manifold and pcv

Has anyone hooked up a PCV valve to a Weber manifold after itís installed on the car? I need it to pass smog,or am I ****ed?
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Old 08-11-2022, 03:20 PM
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You have a valve cover breather? Temporarily replace it with a PVC valve then route a hose to something that looks like a port on the manifold. Or Superglue a brass fitting to tge manifold somewhere. Or maybe to a velocity stack.
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Old 08-11-2022, 04:34 PM
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I've always wondered if anyone with a real Weber or one of the faux 8-stack EFI systems has ever been challenged on this. My car from Roush came with the breather on the manifold and Colorado didn't question it nor mention a PCV. The only thing I could think of to do would be to route the tube into one of the trumpets. Roush did manage to fit a MAF in one of the trumpets so I can believe a PCV return would fit somewhere.
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Old 08-11-2022, 08:00 PM
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The manifold for my Webers has two ports on the floor of the manifold, sealed by pipe plugs. I ran an inline PCV valve over to the valve cover breathers.
Drastically cut down on oil blow by.
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Old 08-12-2022, 03:12 PM
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You can do it. I have.

In fact, I'd be happy to give you a reasonable price on the parts I used to get my IDAs to pass....if I can find them. It would include valve covers, one with PCV, hoses, and aluminum spacers for under the webers, one with a port and barb to attach your breather hose. It worked for me. Your milage may vary.

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Old 08-12-2022, 10:04 PM
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I just recently went through the registration process with a 427 FE and 48IDA Webers. All you have to do is run a hose from the valve cover mounted PCV valve to fitting that is threaded into one of the carburetor air horns. We didn’t even use air filters. After the registration was complete we reinstalled the breather cap and a new carburetor air horn.
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Old 08-13-2022, 04:03 AM
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It would seem to me that if it were to be a permanent installation, that the system would have to be set up to vent to all of the barrels. Given that each barrel is independent of a common plenum, if all of the venting was sent to one cylinder then that would alter the jetting on that one carb and would seem at face value to make it more difficult to balance, but I could be wrong.

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Old 08-13-2022, 04:25 AM
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Quote:
Originally Posted by KarlzEE Bebout View Post
The manifold for my Webers has two ports on the floor of the manifold, sealed by pipe plugs. I ran an inline PCV valve over to the valve cover breathers.
Drastically cut down on oil blow by.
Plumb one of these between the PCV and that manifold connection.
Compact air/oil separator will stop the lion's share of contaminants
from entering the combustion chambers. Very compact solution
to ensure only cleansed air gets re-introduced into the intake.

Bottom screws off to empty and it even has a dipstick.


https://www.addw1.com/collections/oi...-configuration

Last edited by Unique427; 08-13-2022 at 04:30 AM..
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Old 08-13-2022, 10:19 AM
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The CA requirements have changed in the last year or so. I have a stack injection setup and they required that I come up with an air box that enclosed all the stacks together and all valve cover breathers had to be plumbed to it so that it was distributed to all the stacks. This was after I tried to plumb to one stack. It's a pain but once the inspection is done it can all be removed.
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Old 08-14-2022, 12:09 AM
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If the only reason you are installing the PCV system is to get the car registered the system I described above works as needed, then you can remove it and return your system to the cleaner appearance without the PCV. As I stated I just went through the inspection process with the PCV installed as I outlined above and it was passed without issue. If you want a permanent system you will want to supply the PCV gasses to all the cylinders equally, but then why?

As EZ$ pointed out he had to take it a step further, in my opinion it all depends on the inspector as to what they want to see.
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Last edited by CompClassics; 08-14-2022 at 12:11 AM..
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Old 08-14-2022, 07:56 AM
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CompClassics I like your suggestion and will likely go that route. I will have to remove the air box I fabricated. A pita but I guess there’s no other option

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Old 08-14-2022, 02:08 PM
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Quote:
Originally Posted by EZ$ View Post
The CA requirements have changed in the last year or so. I have a stack injection setup and they required that I come up with an air box that enclosed all the stacks together and all valve cover breathers had to be plumbed to it so that it was distributed to all the stacks. This was after I tried to plumb to one stack. It's a pain but once the inspection is done it can all be removed.
I think this is the way to go with my setup.

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Old 08-17-2022, 04:04 PM
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Could I use an electric vacuum pump to simulate the vacuum generated by the manifold in a typical system. Attach one end to the PCV valve, then route the other end to the closed air box? Maybe add an oil separator in between the PCV and the pump?
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Old 08-17-2022, 04:36 PM
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When I got my sb100 sticker, I simply plumbed the proper hose from my valve cover breather into the bottom plate of my air cleaner. Drilled a hole in the plate and screwed in a barbed hose fitting. All they wanted to see was a closed venting of crankcase gasses back into the air cleaner.
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Old 08-17-2022, 04:49 PM
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Quickly fab another closed air box with a cover filter out of galvanized duct work sheet metal. Plumb a connector for the Pcv line. Donít bother to install the air horns. Cost $20 and some of your time. Didnít you make an earlier version of the air box?
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Old 08-17-2022, 05:02 PM
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Bill, couldn't you use these breathers with hoses to the air box?

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Old 08-17-2022, 06:22 PM
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I have one breather cap with a nipple and hose that will go to the air box. But the ref said I had to have the PCV valve installed and using vacuum to pull the gases out of the crankcase. The breather cap with the hose connected actually acts as a fresh air intake into the engine.

Using my design essentially accomplishes the same thing but uses an external pump to provide the vacuum normally achieved bynthe intake manifold.
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Old 08-22-2022, 09:14 PM
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One side completed




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Old 08-22-2022, 10:38 PM
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When I went through the BAR inspection some years ago, they paid close attention to the labeling on the hose. It needed to be clearly labeled as Emissions or PCV hose.
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Old 09-18-2022, 03:12 AM
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If you want a permanent system you will want to supply the PCV gasses to all the cylinders equally, but then why?










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Last edited by mareclodaniel; 09-18-2022 at 04:42 AM..
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