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    Michael,<br>
    <br>
    From your blog post: <br>
    <br>
    "occasionally on overrun very little if any negative pressure was
    evident in the crankcase so, in order to improve things a little I
    installed a plug in the hose which runs from the valve cover to the
    rear air filter and this resulted in a significant improvement"<br>
    <br>
    Probably because you're pulling air (and sump oil) into the
    crankcase through the rear main 'scroll' seal (and dipstick tube and
    oil filler cap hole). This is how the typical, owner-installed PCV
    installation on the 6-cyl cars functions as the PCV valve meters
    gasses both from the crankcase and the valve cover. But ... with
    fresh, filtered air coming in from the carb air filter you
    essentially had a true PCV 'system,' where the gasses--fresh air and
    blowby--are cycled back into the intake manifold to be burned in the
    cylinders. <br>
    <br>
    <br>
    <img
      src="https://www.speednik.com/files/2016/06/2016-06-15_18-14-25.jpg"
      class="n3VNCb KAlRDb" alt="Video: The Importance Of Using A Catch
      Can System" data-noaft="1" style="width: 583px; height: 388.667px;
      margin: 0px;"><br>
    <br>
    <div class="moz-cite-prefix">On 10/30/2022 10:22 AM, Michael Salter
      wrote:<br>
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cite="mid:CAB3i7LLvWwGCfRaZYANodwF8zEiKAJ9qoxkBGcxweA6Q_rOLEQ@mail.gmail.com">
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          <div style="font-family:arial,sans-serif;font-size:small"
            class="gmail_default">Sorry forgot the link...</div>
          <br>
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            <div style="font-family:arial,sans-serif;font-size:small">Adding
              a PCV to a 100.</div>
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              <div style="font-family:arial,sans-serif;font-size:small"
                class="gmail_default"><a
                  href="https://precisionsportscar.com/austin-healey-100-pcv-system/"
                  moz-do-not-send="true" class="moz-txt-link-freetext">https://precisionsportscar.com/austin-healey-100-pcv-system/</a></div>
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