[Healeys] BN1 PCV system

[Michael Salter]

As far as I can figure out Harold, other than the "Dual Flow", your system
is pretty well what I have constructed.
I've read up a little on the dual flow valves and it seems that that would
be of little advantage and a lot bigger than a simple type.
Obviously it's important that the take off at the air cleaner needs to be
getting "filtered" air which the 100 air filter does not.

M

On Sun, Jan 31, 2021 at 1:15 PM Harold Manifold <manifold at telus.net> wrote:

> In my opinion providing a dedicated air intake and separating the streams
> is a step in right direction. This sketch below is what I am planning. One
> possible addition would be a simple air oil separator on the return line
> but I am hesitant to add too much strange looking hardware if it can be
> avoided.
>
> I would appreciate any feedback and comments.
>
> Harold
>
>
> ------------------------------
> *From:* Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of *Michael
> Salter
> *Sent:* Sunday, January 31, 2021 9:41 AM
> *To:* Bob Spidell
> *Cc:* healeys at autox.team.net
> *Subject:* Re: [Healeys] BN1 PCV system
>
> 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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