[Healeys] PCV valve installation

Michael Salter michaelsalter at gmail.com
Sat May 15 14:30:09 MDT 2021 

Well I  finally got to test my PCV system on my 100.
Unfortunately the results were only a qualified success.  I used V408 as
fitted to a 2006 Pathfinder.
This is a horizontally installed spring loaded PCV valve and that is how it
is in my system.
The nice feature of the installation is that it is almost impossible to see.
This pic shows the assembly before fitting and painting.

[image: image.png]
It is interesting to note that the angle cut on the end of the road pipe
(which I have blocked off with a brass plug) is cut the wrong way to
produce a  Bernoulli effect but that is how it was originally.
I removed the dipstick and installed a tube leading to a manometer inside
the car. My buddy watched the manometer while we did an extended test drive.
Most of the time during normal cruise the manometer showed about 8" of
water depression in the crankcase, which would be ideal, however it was
inconsistent.
Sometimes, particularly after a short burst on the the throttle, the
manometer would show 10 or more inches of pressure in the crankcase for a
considerable period of time which was only converted to a depression after
closing the throttle momentarily .
On average there was some degree of depression in the crankcase but the
engine still deposited its customary "mark" when I stopped.
Results inconclusive... more study required.

M






On Sat., May 15, 2021, 3:37 p.m. Tom Mitchell via Healeys, <
healeys at autox.team.net> wrote:

> Ok after a lot of searching and receiving similar PCV parts, yet not
> close.  I finially got a original pvc valve PC727 only to find out that
> it's the same as a NAPA product that I already had.
>
> On Wed, Apr 28, 2021, 6:16 PM healeyguy--- via Healeys <
> healeys at autox.team.net> wrote:
>
>> As mentioned in an earlier email , the stock 100 setup does vent the
>> internal crankcase areas to the atmosphere but only when the car is moving
>> forward. On many early cars the draft tube was the solution. Some cars even
>> had enough engine compartment air movement via the rad fan to activate the
>> process..  The 100 did not have a lot of CFM from the stock fan.
>> The draft tube does make a "negative pressure" at the tip as the air
>> moves under it thus reducing crankcase pressure but when you slow down or
>> stop in traffic that negative pressure goes away. Using manifold pressure
>> was a better solution to meet the early pollution control regulations.
>> P
>>
>> -----Original Message-----
>> From: Michael Oritt via Healeys <healeys at autox.team.net>
>> To: Michael Salter <michaelsalter at gmail.com>
>> Cc: Healey List <healeys at autox.team.net>
>> Sent: Wed, Apr 28, 2021 5:33 pm
>> Subject: Re: [Healeys] PCV valve installation
>>
>> Michael--
>>
>> As I suspected. Why then doesn't the 100's stock vent tube setup serve as
>> a sort of PCV valve in that it lowers crankcase pressures though it does
>> not recirculate gasses into the engine versus the environment?  How
>> different in effect is the venting of positive pressure to the atmosphere
>> versus negative pressure created by the PCV circuit?  Wouldn't the vent
>> tube's being open to atmosphere decrease the chance of blow-by out the rear
>> of the engineer into the bell housing?
>>
>> Best--Michael Oritt
>>
>> On Wed, Apr 28, 2021 at 4:52 PM Michael Salter <michaelsalter at gmail.com>
>> wrote:
>>
>> "must it be blocked off in order to create the vacuum sought?"
>> That's what I did on my yet to be tested system using a brass plug with
>> an "O" ring on it.
>> [image: image.png]
>>
>> Stay tuned for results :-)
>>
>> M
>>
>>
>> On Tue, Apr 27, 2021 at 8:25 PM Michael Oritt via Healeys <
>> healeys at autox.team.net> wrote:
>>
>> Though I am not that familiar with Healey 6 engines I do not believe they
>> have the block vent pipe fitted to 100's which has positive pressure coming
>> out of it with engine running.
>> How does the presence of such a pipe affect the design of a PCV system
>> such as that illustrated--must it be blocked off in order to create the
>> vacuum sought?
>>
>> Best--Michael Oritt
>>
>>
>> On Tue, Apr 27, 2021 at 7:33 PM Roger Grace via Healeys <
>> healeys at autox.team.net> wrote:
>>
>> I am with Harold on this one. In theory, with substantial vacuum holding
>> in the CC you would not move any of the accumulated gasses and moisture
>> from the CC. Would be interested to hear if anyone has actually measured
>> the CC vacuum after the plugging and soldering of all the orifices ?
>> Particularly at idle when the vacuum is high - what does the PCV valve
>> regulate it to ? My car is about 17/18 ins Hg at idle. Would also be
>> interesting to look for oil at the system vacuum inlet pipe after a few
>> miles.
>> Just wondering...
>> rg
>>
>>
>>
>>
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>>
>> On Tue, Apr 27, 2021 at 8:42 AM Harold Manifold via Healeys <
>> healeys at autox.team.net> wrote:
>>
>> The V in PCV is for ventilation. There should be a way for fresh air to
>> get into the engine. In addition to creating a slight vacuum inside the
>> engine ideally the blow by gases that accumulate in the bottom of the block
>> and contaminate the engine oil should be replaced with clear air.
>>
>> [image: Foxbody PCV Valve Replacement – Fox Body Project]
>>
>> Harold
>>
>> *From: *Bob Begani via Healeys <healeys at autox.team.net>
>> *Sent: *Tuesday, April 27, 2021 6:06 AM
>> *To: *Bob Haskell <rchaskell at earthlink.net>; Healey List
>> <healeys at autox.team.net>
>> *Subject: *Re: [Healeys] PCV valve installation
>>
>> Bob:
>>
>> Let me know how your installation works with the hole in the oil fill cap
>> soldered.  No doubt, the rest of the engine is has no breather inlets such
>> as the valve cover?  The reason I ask is I did not solder or seal the oil
>> fill cap and my aluminum valve cover has  a vent on the side into which I
>> stuffed a piece of oiled 3m sanding pad.  The reason was that in the early
>> days of PCV valves on engines the car makers were creating a breather so
>> fresh air could circulate in the engine and some articles indicated it was
>> desirable to keep air flowing to the crankcase.
>>
>> Maybe some of the other listeners who have been using a PVC system sealed
>> could comment on the operation.  Currently on regular 25-mile drives at no
>> more than 60 mph the drips under the bell housing weep hole after the ride
>> are limited to a spot the size of a quarter in the can underneath.  Next
>> time travel on I-75 for 50 miles at higher speeds I will see if the amount
>> of oil increases.  If it does I may seal vent to see what happens.
>>
>> Bob Begani
>>
>> -----Original Message-----
>> From: Bob Haskell <rchaskell at earthlink.net>
>> Sent: Monday, April 26, 2021 8:23 PM
>> To: rfbegani at gmail.com; 'Healey List' <healeys at autox.team.net>
>> Subject: Re: [Healeys] PCV valve installation
>>
>> Bob,
>>
>> Thanks for the info.  I've got mine installed, but haven't driven the car
>> yet - rebuilding a LCS pump for it.  I machined a 5/8"-20 - 3/8"
>> barb fitting to screw into the front manifold. Added six flats for a
>> wrench - Whitworth so I can be annoyed with myself at some future date.
>> To go from the 5/8" diameter on the valve cover tee to the 1/2" diameter
>> inlet on the PCV valve, I shaved the ID of a 5/8" hose and the OD of a 1/2"
>> hose on the lathe and glued them together with rubber cement.  3/8"
>> hose connects the PVC valve to the manifold fitting.  Added hose clamps
>> at each connection and soldered the hole in the oil fill cap.
>>
>> Cheers,
>>
>> Bob Haskell
>> Austin Healey 3000 BN7/BT7 registrar
>>
>> On 4/26/21 6:00 PM, rfbegani at gmail.com wrote:
>> >
>> > Bob:
>> >
>> > I have completed the PCV valve installation by using a 3 inch piece of
>> > the 5/8” hose on the manifold side and inserting a 5/16 “ heater hose
>> > into it with a hose clamp.    Then the 5/16” hose attaches a 1/8” x ¼”
>> > brass fitting with a hose clamp from the parts store I installed into
>> > the small opening on the intake manifold to the right of the large
>> > opening for the brake booster.  No leakage and strong negative
>> > pressure have reduced my oil leaks into the bell housing and the
>> > clutch dramatically.
>> >
>> > Bob Begani
>> >
>> > *From:* Healeys <healeys-bounces at autox.team.net> *On Behalf Of *Bob
>> > Haskell
>> > *Sent:* Friday, April 9, 2021 3:10 PM
>> > *To:* Healey List <healeys at autox.team.net>
>> > *Subject:* [Healeys] PCV valve installation
>> >
>> > Listers,
>> >
>> > Attempting to install a PCV valve on our tri-carb engine per Norm
>> > Nock's Tech Tip (page 98).  Made an adapter (5/8"-18 to 3/8" barb)
>> > that replaces the plug in the front inlet manifold.  3/8" hose to the
>> > PCV valve.  Two questions:
>> >
>> > 1) Does the PCV valve need to be orientated in a particular way?
>> > Norm's diagram shows it horizontal and I have seen them on non-Healeys
>> > vertical (engine side down).
>> >
>> > 2) The valve cover tee is 5/8" diameter, the engine side of the PCV
>> > valve is 1/2".  Anyone know of a short hose with different diameters
>> > on each end?
>> >
>> > Thanks.
>> >
>> > Cheers,
>> > Bob Haskell
>> > Austin Healey 3000 BN7/BT7 registrar
>>
>>
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