Proper PCV arrangment for a 2L, A little help please Options

[North Coast Jim]

Have a newly rebuilt 2L in the car with 40 IDF Weber carbs which is running fine except for a RMS dripping oil. We believe we installed it correctly and took careful steps assembling the rest of the engine/flywheel/clutch/transmission. We believe that the crankcase vent system is not working properly which is pressurizing the crankcase as RPM builds, thereby pushing oil out the RMS.

My oil fill assy has a 022115542 PCV assy in it and a solid oil fill cap. I took the valve out to see if it was working. When I blow into the bottom it is initially open. Increased pressure it closes the valve. Seems backward to me. My oil fill tower has no vent in it.

I do know that when I got this motor, 6 years ago, the PCV assy was in pieces all captured in the oil fill assy. I took it out and reassembled it thinking it was correct. Maybe not ??

I have Len Hoffman heads when he sold them direct and the vents are capped shut per his instructions.

Any help is appreciated.

[Dave_Darling]

One minor problem is that there is no "correct" PCV setup for a carbureted four-cylinder 914. US-spec cars did not come with carbs on them, and those were the ones with mandated PCV systems.

Your setup is aftermarket, and you or whoever you had convert it has to work out how to deal with the fumes and such.

--DD

[JamesM]

One minor problem is that there is no "correct" PCV setup for a carbureted four-cylinder 914. US-spec cars did not come with carbs on them, and those were the ones with mandated PCV systems.

Your setup is aftermarket, and you or whoever you had convert it has to work out how to deal with the fumes and such.

--DD

There is no factory correct way, but there are a lot of really wrong (see dysfunctional)
ways I have see people do it. Of course up Until the 1.8 all the factory approaches also had a level of dysfunction to them as well.


The most functional way for dual carbs, ITBs, whatever, is what I listed above.

No head ports/plugged head ports
3/4" from the oil tower, either modify or use one from a 75-76 2.0
Pop one of these bad boys inline (PN: 06A129101D)
Vent to one of the air cleaners

Using a proper valve gives a measurable improvement in crankcase pressure/vacuum over an open vent


this is at least the most functional while remaining simple way that I have come up with. If someone has a better way i would love to know about it.