[Healeys] PCV valve installation

Wed Apr 28 16:13:53 MDT 2021

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.
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.  Harold From: Bob Begani via Healeys
Sent: Tuesday, April 27, 2021 6:06 AM
To: Bob Haskell; Healey List
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 PMTo: 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 HaskellAustin 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  _______________________________________________Support Team.Net http://www.team.net/donate.htmlSuggested annual donation  $12.75 Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive Healeys@autox.team.nethttp://autox.team.net/mailman/listinfo/healeys Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/manifold@telus.net  _______________________________________________
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