[Healeys] BN1 PCV system

gradea1 at charter.net gradea1 at charter.net
Sun Jan 31 12:08:35 MST 2021


>From what I recall from my Smog Class days (I had a smog license to
repair systems), this is the basic "Type 3" system. To upgrade
'50-'60s vehicles you punched a hole in the air cleaner (some oil
bath), added a fitting and hose, and plugged the downpipe tube from
the crankcase with a rubber plug. It would then pass early emission
tests.
This is basicly like the Healey system which was sans a PVC valve, but
met early standards...not today, however. Multiple carbs gave the
Healey an exemption in those days.
The big problem with this system is engine wear. When things like
rocker shafts or bushings wear, the oil gap is enlarged allowing
geysers to form in the valve cover, and then the oil gets sucked out
to the air intake and sent out the exhaust. Folks thought the rings or
bearings had failed and started an engine rebuild, when only the
rocker shaft was the issue.
I tend to stick to originality, and just drive my stinky old Healey,
which would never pass any standards nowadays. Hank

	-----------------------------------------From: "Harold Manifold" 
To: "Michael Salter", "Bob Spidell"
Cc: healeys at autox.team.net
Sent: Sunday January 31 2021 10:23:00AM
Subject: Re: [Healeys] BN1 PCV system

 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,  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.
 >
 >  [1]http://mewagner.com/ [2]
 >
 > 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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