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AFAIK, Norman Nock was the first to advocate for a PCV. His solution
involved sealing the oil filler cap--I used a small sheet metal
screw--and a seal on the dipstick to seal the tube, and venting the
valve into the unused port on the intake manifold (Norman was an
'old school' mechanic willing to try new things). It's not a true
PCV system in that there is no fresh air source, other than what can
be drawn through the rear crankshaft 'seal' or any other leaks. I
was concerned about the valve gunking-up or the rear cylinders
sooting-up excessively, but neither happened in (probably) 100K or
more miles on my BJ8 (photo of head when removed attached). You can
feel significant vacuum if you held your hand over the filler hole
at idle; and after installation my oil usage was cut roughly in
half. When I had the engine overhauled my builder was adamant that
he not use the crank seal I'd provided, and designed and built an
elegant solution, still using the original valve. My BN2 has what I
feel is excessive crankcase pressure, although it has excellent
compression (170psi +/- on all four). I would like to install a
system similar to what Michael S is building, but haven't committed
to the effort yet. I'd like to know which valve is suitable for the
engine (the one used on my BJ8 would likely be suitable, but I have
no idea what it is). <br>
<br>
I remember when we first became 'smog conscious,' and hotrodders
went ballistic claiming all the 'smog shit' was going to ruin our
engines, and the auto companies whined like little bitches. That was
true, for a while, but now I have a 5L NA V8 capable of 480HP with
93-octane fuel--which I can't generally get around here--and, oh, it
has a PCV system (and cats, etc.). I installed a catch can, and it
traps about 1tsp of oil per 1,000 miles that would otherwise end up
in the intake or the backside of the intake valves (though it has
both DI and PI so, hopefully, the PI keeps things clean). As far as
I can tell, the PCV operates 'autonomously,' and I've never seen or
heard of a code for it, but the ECU could probably tell if something
was amiss with it (but maybe not).<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 4/4/2021 5:46 AM, <a class="moz-txt-link-abbreviated" href="mailto:rfbegani@gmail.com">rfbegani@gmail.com</a>
wrote:<br>
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cite="mid:022601d72950$81473910$83d5ab30$@gmail.com">
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<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"> <o:p></o:p></span></p>
<p style="margin-top:0in;background:white;box-sizing:
border-box;margin-bottom:1rem;font-variant-ligatures:
normal;font-variant-caps: normal;orphans: 2;widows:
2;-webkit-text-stroke-width: 0px;text-decoration-thickness:
initial;text-decoration-style: initial;text-decoration-color:
initial;word-spacing:0px"><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.<o:p></o:p></span></p>
<p style="margin-top:0in;background:white;box-sizing:
border-box;margin-bottom:1rem;font-variant-ligatures:
normal;font-variant-caps: normal;orphans: 2;widows:
2;-webkit-text-stroke-width: 0px;text-decoration-thickness:
initial;text-decoration-style: initial;text-decoration-color:
initial;word-spacing:0px"><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.<o:p></o:p></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" moz-do-not-send="true">https://tinyurl.com/drx8m62w</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></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?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif">Ideas?
Comments?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial",sans-serif">Bob
Begani BJ8 late 67<o:p></o:p></span></p>
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