As far as an engine PCV set-up, yes.
It is designed to run with an otherwise
closed crankcase with the possible
exception of a small hole in the filtered
oil filler cap, as specified (or not) for the
original application.
The above having been said, the otherwise "vented" (through breathers -
no PCV system)
crankcase is a purely "open" system.
My new Rivergate engine is "open
crankcase". It has no PCV system.
It has a 1/2" breather on the valve
cover and another 3/4" breather fabricated
over the hole used by the old mechanical
fuel pump. It has the Rivergate rear engine plate incorporating a real
oil seal.
It is a tuned 1293 "tailored" for low pressure supercharging (Judson)
running
a static CR of 8.3-1 (aluminum head).
The engine has just done 500 miles and
is now being pushed to 4,500rpm every
now and then....it still has a tendency
to run on the warm side (not fully broken
in as yet) but, absolutely no oil leaks thus
far; absolutely none.
The oil filler cap also has a small,
calibrated orifice.
All "holes" for beathing are filtered, including the calibrated hole in
the oil
filler cap.
The PCV set-up (a la '67 timing case
cover to intake manifold through diaphragm equipped "valve") works
best. The carbs are out of the PCV
"loop" (unlike later emissions applications)
and are thus, spared contamination by
crankcase gasses. The crankcase
vapors are literally "sucked" out of the
crankcase through "calibrated orifices"
into the intake manifold to be equally
distributed to all cylinders in proportions
that are cleanly combustible. Crankase
pressure (against oil seals) is minimized
accordingly.
This particular "early" PCV set-up is
a "friend" of the engine, unlike later
set-ups which contaminated the carbs.
with all sorts of crankcase vapor "junk",
eventually "gumming up" their works. Of
course, the priority at this point was
cleaner air through more complete
combustion, not performance or even
economy.
Cap'n. Bob
'60 :{)
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