To that end, I note that the TR4A (which had the first closed-system PCV
system) had a special oil filler cap. It can be identified by the little
"housing" that sits on top of it. I believe it's purpose is to allow a
certain amount of fresh air into the engine. The factory manual emphasizes
that the little breather hole in this cap should be kept clean.
Chris
----- Original Message -----
From: "Randall" <tr3driver@comcast.net>
To: <triumphs@autox.team.net>
Sent: Wednesday, April 12, 2006 11:44 AM
Subject: RE: [TR] Negative Pressure in Crankcase -uninformed question
> > Obviously, this is well understood by the
> > professionals, but is the negative pressure so slight that there
> > is no reverse flow to the system and how is this regulated?
>
> Depends on cases of course. But for long life, there needs to be a fresh
> air intake supplying filtered air. This is the way modern PCV systems
work.
> Otherwise the blowby gases will condense moisture, varnish and acid inside
> the engine, even with the vacuum. The moisture content of outside air is
> far lower than that of combustion gases.
>
> Randall
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