[Healeys] BJ8 Large oil consumption

[Alan Seigrist]

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


On Sun, Jul 27, 2014 at 11:54 PM, <warthodson at aol.com> wrote:

> Alan,
> I often read about installing a PCV to help reduce oil leak issues. I know
> there is more that one way to plumb a PCV, but I do not understand how it
> could help reduce oil leaks when compared to an engine which is plumbed
> with the original crankcase ventilation system (PCV) & no owner installed
> modifications (except the rear crankshaft seal).
>
> Gary Hodson