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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@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@autox.team.net] On Behalf Of Bob
> > Spidell
> > Sent: Saturday, January 30, 2021 2:41 PM
> > To: healeys@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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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">I have decided to cut some "plugs" out of a cha=
insaw foam air filter and insert them into the rocker cover hose. I'm t=
hinking that flow in that hose will be the source of intake air into the en=
gine.<div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat., Jan. 30,=
2021, 8:45 p.m. Bob Spidell, <<a href=3D"mailto:bspidell@comcast.net";>b=
spidell@comcast.net</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">=
The best place for a fresh air source would be a small filter on the oil <b=
r>
filter cap. Obviously, not an easy thing to rig up. Or, you could put a <br=
>
tube on the backside of one of the carbs, but you'd want a better filte=
r <br>
than the stock grasshopper-stoppers.<br>
<br>
On 1/30/2021 3:48 PM, Harold Manifold wrote:<br>
> I am also looking into a PCV system for my BT7 as well. Most of the PC=
V<br>
> systems I have seen on Healey's don't have a filtered fresh ai=
r intake and<br>
> don't have much ability to replace the blow by and other nasty'=
;s that will<br>
> accumulate in the bottom of the block. To have air changes in the bott=
om of<br>
> the block a filtered fresh air source is needed and slight vacuum to d=
raw<br>
> out anything that accumulates. Ideally the fresh air would come in at =
one of<br>
> the block and the bad air leave at the other end. There is a connectio=
n<br>
> between the tappet section and the bottom of the block but this is als=
o the<br>
> oil return. (A BN1 engine may be different) A PCV can be used to contr=
ol the<br>
> system but if the air circulating bypasses most of the engine then the=
<br>
> system is less effective. On V8 engines the clean air comes in through=
one<br>
> valve cover, passes through the bottom of the block and then exists vi=
a the<br>
> other valve cover drawn by vacuum from the intake.<br>
><br>
> Any good ideas where to locate a filter fresh air source?<br>
><br>
> This website has excellent information on PCV valves and is where I fo=
und<br>
> the attached article by Tony Ball.<br>
><br>
> <a href=3D"http://mewagner.com/"; rel=3D"noreferrer noreferrer" target=
=3D"_blank">http://mewagner.com/</a><br>
><br>
> Harold<br>
><br>
><br>
><br>
> -----Original Message-----<br>
> From: Healeys [mailto:<a href=3D"mailto:healeys-bounces@autox.team.net=
" target=3D"_blank" rel=3D"noreferrer">healeys-bounces@autox.team.net</a>] =
On Behalf Of Bob<br>
> Spidell<br>
> Sent: Saturday, January 30, 2021 2:41 PM<br>
> To: <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D=
"noreferrer">healeys@autox.team.net</a><br>
> Subject: Re: [Healeys] BN1 PCV system<br>
><br>
> Looks clean, Michael. I am considering similar for my BN2 (but I plan =
to fab<br>
> a plate with an elbow to replace the road draft tube). If you plug the=
valve<br>
> cover vent, you'll have a 'system' similar to what I have =
on my BJ8, which<br>
> is an updated version of the original Norman Nock design.<br>
> This isn't really a PCV system, as the crankcase and valve cover w=
ill be<br>
> under continuous vacuum. I suspect some air is drawn in from the rear<=
br>
> 'seal,' which is not filtered but helps to alleviate the infam=
ous Healey<br>
> bellhousing drip, and likely doesn't affect mixture all that much.=
If you<br>
> leave the vent open--I'd put an air filter on it--you'll have =
a genuine PCV<br>
> system as air will be constantly circulated through the crankcase and =
top<br>
> end. This is what I plan to do, but my 100M is vented to the CAB, for =
which<br>
> I have a large K&N filter on the intake duct in front of the radia=
tor.<br>
><br>
> Which PCV valve did you select?<br>
><br>
> Bob<br>
><br>
><br>
><br>
> On 1/30/2021 12:20 PM, Michael Salter wrote:<br>
>> After months of deliberation I have constructed this PCV system fo=
r my<br>
>> BN1.<br>
>> The original road draft tube has been plugged just below the PCV v=
alve<br>
>> takeoff.<br>
>> Of importance was that the system would be almost impossible to se=
e<br>
>> without very close inspection.<br>
>> I'm still trying to decide if I should plug the normal valve c=
over<br>
>> vent or leave it open to serve as the PCV system intake.<br>
>> Thoughts?<br>
>><br>
>> M<br>
>><br>
><br>
<br>
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