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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Bob,</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>PCV systems are more important than many recognize. The original system on our Healey’s is an improvement over a road draft tube but doesn’t have some of the key features a PCV should have. A good PCV system should replace contaminated air with fresh air in the bottom of the block, the valve cover and valve train and not allow oil and oil mist to be drawn out the engine, all while maintaining a slight negative pressure inside the engine. Some Healey’s have a problem with oil and oil mist in the rear carb if too much oil is going to the rocker shaft and the screen from the T connection is missing. This configuration is easier to achieve on a V8 where fresh air can enter through one valve cover and bad air exist through the other.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>On a Healey I suggest the Tee connection should be the fresh air intake either from the rear air filter or a K&N type filter and the pipe on the tappet cover should be connected to a PCV valve and then a vacuum source. One side of the Tee connection would be blocked or replaced with a 90 degree.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=600 height=345 style='width:6.25in;height:3.5937in' id="Picture_x0020_5" src="cid:image001.gif@01D72932.05707A40"></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thought and comments?</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Harold<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:rfbegani@gmail.com">rfbegani@gmail.com</a><br><b>Sent: </b>Sunday, April 4, 2021 5:48 AM<br><b>To: </b><a href="mailto:healeys@autox.team.net">Austin Healey list</a><br><b>Subject: </b>[Healeys] OI. Leaks and a PVC valve engine breather system.</p></div><p class=MsoNormal><o:p> </o:p></p><p style='margin-top:0in;background:white'><strong><span style='font-size:12.0pt;font-family:"Calibri",sans-serif;color:#212529'>How does it work?</span></strong><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#212529'> </span></p><p style='margin-top:0in;background:white'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#212529'>The system is simple. The PCV valve regulates how much vacuum can pull through the crankcase. It’s hooked into the intake - when the vacuum is high at idle, the PCV valve stops most of that vacuum. As vacuum drops with an increase in RPM, The PCV valve opens, to allow a higher volume of gasses and pressure to be pulled into the intake. As a result, those gasses are recirculated back into the combustion cycle, and burnt off with the fresh fuel and air, preventing those gasses from condensing in the oil, preventing pressure from causing the seals to leak, and preventing pollution from escaping the crankcase.</span></p><p style='margin-top:0in;background:white'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#212529'>The breather tube allows fresh air to be pulled into the engine, after the air filter, ensuring debris and moisture aren’t pulled into the engine.</span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>You can read the entire article: <a href="https://tinyurl.com/drx8m62w"><span style='color:#0563C1'>https://tinyurl.com/drx8m62w</span></a></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>Note the comment preventing pressure from causing the seals to leak. Regarding the Breathing Tube which we do not have on our engines, in my recently installed system I plugged the breather vent in my valve cover with a solid piece of rubber, although as one listener indicated there is a small opening on the valve cover cap. I will check how much is flowing through this tiny hole so the engine breaths and circulates air the crankcase and if it is acting as a breather tube. It maybe that the T on the top of the Valve cover will need to be blocked?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>Ideas? Comments?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>Regards,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>Bob Begani BJ8 late 67</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>