Alan,
Thanks for describing the correct plumbing. I have seen the Positive
Crankcase Ventilation (PVC) valve installed in the hose between the "T"
fitting on the valve cover & the air cleaner as well as many other variations.
I assume you are installing the PCV valve in a hose from the "T" fitting on
the valve cover to the intake manifold fitting. Correct? I guess my point is
that the original PCV system produces a mild negative pressure in the
crankcase & reduces oil leaks in an engine with or without a rear oil seal kit
if the rest of the engine is in good condition. No PVC system will prevent oil
leaks if the engine is in poor condition or the gaskets are leaking. The
original system also recycles unburned hydrocarbons, etc.
Gary Hodson
-----Original Message-----
From: Alan Seigrist <healey.nut@gmail.com>
Subject:
Re: [Healeys] BJ8 Large oil consumption
Gary -
If it is hooked up correctly,
you will plumb the PCV into the intake manifold which is always under negative
pressure when the engine is running. The PCV is just a one way valve.
Basically, directly plumbed into the intake manifold would put the crankcase
under a mild negative pressure, meaning that oil ... rather than being pushed
out the gaps in gaskets (with normal positive pressure in the crankcase) ...
the oil will naturally want to stay in the crankcase. You need a PCV because
if you get any sort of prefire in the intake manifold, you don't want it
blowing back into the crankcase. The PCV has the added advantage of recycling
unburned hydrocarbons back into your combustion chamber, hence why they first
appeared on pollution controlled vehicles in the late 60s. This is one
pollution control device that actually is good for the running of your motor
and generally helps burn off excess fuel and oil.
Best,
Alan
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