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I have a 1995 5.8 I’m converting to carb. It has a hose connector on the oil fill stand pipe. Can I weld this shut and just run the POV from the other valve cover to the air cleaner? It has a plastic screw in cap with no vent for the oil fill cap.
You should keep the PCV SYSTEM a CLOSED design. Even an aftermarket air cleaner should have a provision for a fresh air inlet.
You should keep the PCV SYSTEM a CLOSED design. Even an aftermarket air cleaner should have a provision for a fresh air inlet.
I plan to keep the pcv running to the air cleaner.
what I don’t know is what to do with the tube on the filler neck on the other valve cover that’s off of an EFI motor and this one carbureted.
the oil filler cap is a hard plastic screw in type.
The PCV valve needs to be plugged into the crankcase on one end, and the other to the intake manifold vacuum, not to the air cleaner. Then, the other side needs to allow fresh clean air to be drawn in when the PCV valve opens.
The new EFI intakes have the PCV valve installed in a hole in the back of the intake manifold that leads to the crank case, and its hose is connected to the intake plenum to get manifold vacuum. That hose that goes into the side of the oil fill tube provides the clean air needed for when the valve opens up.
Carbureted intakes probably don't have this hole ini the back, so you will need the valve cover with the hole for the PCV valve. Now you need to provide a clean air inlet on the other valve cover, and that could be done with and old style cover that has a regular fill hole, and install an oil cap with a breather filter on it. This is my setup using Cobra valve covers that have short fill tubes on them:
The cap on the passenger side has a grommeted hole that the PCV valve fits into, and the hose from the valve goes into the base of the carburetor to get manifold vacuum. The cap on the driver side has an opening on the side for plumbing into the air cleaner outer housing where that little filter things is installed. I connected it directly to the cap.
If you have valve covers with flat fill holes on them, you will need to install a grommet into the hole that can accommodate a PCV valve.
If you want to use the EFI valve cover on the other side, you can plumb that hose on the fill tube to the clean side of your air cleaner, or try to find a small filter to put onto the hose and just vent that side to the atmosphere.
The PCV valve needs to be plugged into the crankcase on one end, and the other to the intake manifold vacuum, not to the air cleaner. Then, the other side needs to allow fresh clean air to be drawn in when the PCV valve opens.
... uh ... The fresh air inlet is being discussed above, not vacuum source for the actual valve.
Passenger side with pcv gromet Driver side filler cap with vent tube. I do not like the looks of this tube. 351 ho base plate 351 HO manifold. The egr hole keeps me from using a standard 4 barrel spacer. Wanting to use an older 4100 carb and no large vacuum outlet. I have a standard 4barrel spacer with a pcv hose and valve already attached, but it’s non egr
I plan to keep the pcv running to the air cleaner.
what I don’t know is what to do with the tube on the filler neck on the other valve cover that’s off of an EFI motor and this one carbureted.
the oil filler cap is a hard plastic screw in type.
The short tube (left rocker cover oil fill tube) is for the fresh air supply from the air box. Simply connect the fresh air inlet from the replacement carb air cleaner and that one side will be done.
The short tube (left rocker cover oil fill tube) is for the fresh air supply from the air box. Simply connect the fresh air inlet from the replacement carb air cleaner and that one side will be done.
ok I’ll run it to the air cleaner. Done
i may have to remove a intake vacuum plug and run the pcv to that.
What I would do is try and find another RS rocker cover with the hole and grommet (will that hole accept an early twist-on cap or is it perfectly round w/o the grommet)?
You also have an EGR 4V intake manifold. Are you going to keep the EGR function?
What I would do is try and find another RS rocker cover with the hole and grommet (will that hole accept an early twist-on cap or is it perfectly round w/
You also have an EGR 4V intake manifold. Are you going to keep the EGR function?
no egr
My filler is completely round but I believe I can grind it out and have same as rs valve cover.
You have ann EGR INTAKE MANIFOLD. How do you plan on defeating the EGR?
If you keep the EGR carb spacer and remove the EGR valve and block the valve opening (block-off plate) you will have a nipple for the PCV VALVE at the rear of the spacer.
You can remove the oil filler tube and leave an opening for a grommet and push-in oil filler cap.
You have ann EGR INTAKE MANIFOLD. How do you plan on defeating the EGR?
If you keep the EGR carb spacer and remove the EGR valve and block the valve opening (block-off plate) you will have a nipple for the PCV VALVE at the rear of the spacer.
You can remove the oil filler tube and leave an opening for a grommet and push-in oil filler cap.
Copy, but just a little more aggravation, that EGR spacer is going to be filled with exhaust so the carb temp will be high. Consider a phenolic 1/4" spacer between it and the carb base.
Or you can install new intake manifold gaskets that block off the exhaust passage right at the intake interface.
Originally Posted by KULTULZ
... uh ... The fresh air inlet is being discussed above, not vacuum source for the actual valve.
I was responding to this:from Ar. Hillbilly:
"I plan to keep the pcv running to the air cleaner."
I got the impression he was running the PCV hose to the air cleaner, which would not work.
For that tube sticking out the side of the filler neck, you can still run a hose from it to the air cleaner, or just install a little filter on it like I did.
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