Hi Bill,
Your valve cover and crankcase could simply be connected together with a T,
then run a hose from the free leg of the T, down under the car to vent. I'd
put the T as high as possible, to keep splashed oil IN, but no filter is
really necessary. The valve cover and crankcase live in the same atmosphere
and, if you don't have a lot of blow-by (from worn out compression rings),
it's not all that critical.
You'll definitely want to cap off that (or any) vacuum nipple, as a vacuum
leak can do harm to an engine pronto by leaning the mixture. If it were me,
I'd cap it off in such a way as to be able to connect a vacuum gauge to the
system, for fiddling with the carbs and timing to optimize your efficiency.
In real life, MUCH can be gleaned from the use a vacuum gauge. I would
strongly suggest that everybody on the planet who likes to mess with
infernal combustion engines should have, and know how to read, a vacuum
gauge. Buy a good one, with a comprehensive instruction manual and keep it
handy for reference when your tinkering...you might be amazed at how much it
can tell you. We used to call it the 'poor man's Sun machine' and it 's
probably the best value to dollar ratio you'll have in your toolbox.
A vacuum gauge can, among other things, tell you:
If your timing is too far advanced or retarded.
If your rings are worn out (or not broken in).
If your valves are leaking or sticking.
If your valve springs are weak.
If you have a vacuum leak or if your dog has been unfaithful.
In other words, it's one of the best troubleshooting tools you can have in
your armamentarium (with the manual close at hand for reference AND it will
amaze and astound your friends and other casual observers when you hang a
gauge, plug it in, read the thing, refer to the book and say 'ah-ha' every
so often, all for less than fifty bucks. You can also use a long hose, hang
the thing inside the car and watch it while you drive. BMW put one in their
325 cars and called it a 'gas mileage meter', complete with numbers to
indicate the MPG of the moment. Ridiculous, of course, but it probably did
keep a few people from widening on the throttle too much which would, of
course, effect efficiency.
Well, sorry for the diatribe...had too much coffee at the in-laws this
afternoon...
Hope this helps or amuses, more than confuses.
Mark in Modesto
'53 Fordor "Phillup"
(Phillup Morris, of course)
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