[Healeys] BN1 PCV system

[Michael Salter]

I have decided to cut some "plugs" out of a chainsaw foam air filter and
insert them into the rocker cover hose. I'm thinking that flow in that hose
will be the source of intake air into the engine.

M

On Sat., Jan. 30, 2021, 8:45 p.m. Bob Spidell, <bspidell at comcast.net> wrote:

> The best place for a fresh air source would be a small filter on the oil
> filter cap. Obviously, not an easy thing to rig up. Or, you could put a
> tube on the backside of one of the carbs, but you'd want a better filter
> than the stock grasshopper-stoppers.
>
> On 1/30/2021 3:48 PM, Harold Manifold wrote:
> > I am also looking into a PCV system for my BT7 as well. Most of the PCV
> > systems I have seen on Healey's don't have a filtered fresh air intake
> and
> > don't have much ability to replace the blow by and other nasty's that
> will
> > accumulate in the bottom of the block. To have air changes in the bottom
> of
> > the block a filtered fresh air source is needed and slight vacuum to draw
> > out anything that accumulates. Ideally the fresh air would come in at
> one of
> > the block and the bad air leave at the other end. There is a connection
> > between the tappet section and the bottom of the block but this is also
> the
> > oil return. (A BN1 engine may be different) A PCV can be used to control
> the
> > system but if the air circulating bypasses most of the engine then the
> > system is less effective. On V8 engines the clean air comes in through
> one
> > valve cover, passes through the bottom of the block and then exists via
> the
> > other valve cover drawn by vacuum from the intake.
> >
> > Any good ideas where to locate a filter fresh air source?
> >
> > This website has excellent information on PCV valves and is where I found
> > the attached article by Tony Ball.
> >
> > http://mewagner.com/
> >
> > Harold
> >
> >
> >
> > -----Original Message-----
> > From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
> > Spidell
> > Sent: Saturday, January 30, 2021 2:41 PM
> > To: healeys at autox.team.net
> > Subject: Re: [Healeys] BN1 PCV system
> >
> > Looks clean, Michael. I am considering similar for my BN2 (but I plan to
> fab
> > a plate with an elbow to replace the road draft tube). If you plug the
> valve
> > cover vent, you'll have a 'system' similar to what I have on my BJ8,
> which
> > is an updated version of the original Norman Nock design.
> > This isn't really a PCV system, as the crankcase and valve cover will be
> > under continuous vacuum. I suspect some air is drawn in from the rear
> > 'seal,' which is not filtered but helps to alleviate the infamous Healey
> > bellhousing drip, and likely doesn't affect mixture all that much. If you
> > leave the vent open--I'd put an air filter on it--you'll have a genuine
> PCV
> > system as air will be constantly circulated through the crankcase and top
> > end. This is what I plan to do, but my 100M is vented to the CAB, for
> which
> > I have a large K&N filter on the intake duct in front of the radiator.
> >
> > Which PCV valve did you select?
> >
> > Bob
> >
> >
> >
> > On 1/30/2021 12:20 PM, Michael Salter wrote:
> >> After months of deliberation I have constructed this PCV system for my
> >> BN1.
> >> The original road draft tube has been plugged just below the PCV valve
> >> takeoff.
> >> Of importance was that the system would be almost impossible to see
> >> without very close inspection.
> >> I'm still trying to decide if I should plug the normal valve cover
> >> vent or leave it open to serve as the PCV system intake.
> >> Thoughts?
> >>
> >> M
> >>
> >
>
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