Actually, what you are describing sounds exactly like the factory PCV
setup on a 66. From what I can tell in Clausager, it is also correct for
1964 GA series motors (G series motors vented the front side cover to
atmosphere and had a pipe from the rocker cover to the front air filter).
This should have a hose from the front side cover connecting to the flat
Smiths PCV, which is attached to a plumbing fitting in the manifold by a
very short hose, and supported by a funky angle bracket. See Clausager
page 61. There are no additional fittings on the valve cover; only the
oil filler cap.
BTW the positive crackcase ventilation system is not primarily there for
the environmental benefit. It is there to vent excess crankcase pressure
to avoid oil blowby into the cylinders. That is why it exists in early
cars, long before any pollution control regulations were legislated,
starting in 1967.
It sounds like you have no crankcase ventilation at all at present, since
you don't have a vent either in the rocker arm cover or the front side
plate. This is probably a bad idea. I would recommend implementing the
18GA setup, since you could still use your alloy valve cover. All you
need to locate is the proper front tappet cover (side plate), since you
have the right PCV and manifold. A bit of rubber hose and you're all set!
Max
Chris Attias had this to say:
>My MGB is registered now as a '64 in California. In it's last life
>in Oregon, it was registered as a '66, and had a Smiths PCV valve
>somewhat crudely plumbed into the manifold--a small pipe nipple
>drilled and tapped into the manifold, a piece of steel angle to hold
>it up. I don't know if a '64 in CA at the time would have had to
>have been retrofit for a PCV. When I got it, the car had the early
>valve cover and front air cleaner for the non-PCV breather/vent hose
>in place, but not the front tappet chest cover for a road-draft
>crankcase vent. I am now running an alloy valvecover without a vent
>tube (chrome cap has small vent hole.)
>
>The angel on one shoulder is telling me not to mess with the way it's
>set up for the sake of the environment, but the guy with the
>pitchfork on the other one wants to return to greater originality...
>
>Question is, how much venting does a pre-PCV engine need at the valve
>cover? Would I need to add a fitting there, as it had originally, or
>would a vent tube at the tappet chest be sufficient?
>
>
>
>
>
>Chris Attias
>'64 MGB
>'84 Alfa Romeo GTV-6
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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