[Vwdiesel] Crappy fuel? (was Touareg)

[Nate Wall]

The reason its not PCV on a diesel, is because there is no engine
vacuum. The vapors just get pushed out w/ the positive pressure of
blowby on the diesel. On gas engines, the "Positive" in the PCV comes
from engine vacuum purging the crancase with fresh air, in a positive
manner. Its a controlled/metered vacuum leak. At idle, when manifold
vacuum is greatest, the purge rate is so high (fresh air through the air
cleaner, into the valve cover, and another hose to the intake manifold,
below the throttle plate), the engine will not idle, hence the use of a
PCV valve to slow the rate at idle, The valve permits LESS flow thru it
as vacuum level rises. At WOT (Wide Open Throttle) the flow may even be
in the reverse direction, where blow-by moves thru the fresh air hose to
the air cleaner, since manifold vacuum is very low.

--Nate

TexasTDI wrote:

> Crank Case Ventilation, similar to the PCV valve on a gasser.
>
> Chris Thornton
> 1991 VW Jetta GL 2 Door 1.6D - 234k miles
> 2000 VW Golf GLS 1.9TDI 130hp/229ftlbs - 77k miles
> Amsoil Synthetic Lubricants Dealer #1098500
> http://www.amsoil.com
> http://texastdi.com/6/ubb.x
>
> ----- Original Message -----
> From: "Bryan Belman" <dieselwesty at yahoo.com>
> To: "TexasTDI" <TexasVWdriver at hotmail.com>
> Sent: Monday, February 24, 2003 12:09 PM
> Subject: Re: [Vwdiesel] Crappy fuel? (was Touareg)
>
> > Don't mean to be stupid, but what is a CCV?
> >
> > Thanks,
> > Bryan
> >
> > --- TexasTDI <TexasVWdriver at hotmail.com> wrote:
> > > It's no "design flaw" except for the fact that a
> > > diesel motor was never
> > > intended to have an EGR or CCV.  But thanks to the
> > > EPA, diesels have to have
> > > them now.
> > >
> > > EGR and CCV are but two things the EPA requires that
> > > actually HARM the
> > > motor.  The EPA could care less about how long the
> > > motor lasts as long as it
> > > pollutes less.
> > >
> > > Another example is the new Honda's and Ford car's
> > > using 5w-20 oil.  That's
> > > way too thin of an oil for virtually any climate,
> > > unless you live in the
> > > Arctic.  Think those cars will live past 100k miles?
> > >  HAH!  But it allows
> > > the cars to pollute less, so that's the weight of
> > > oil they're using.
> > >
> > > And AFAIK, all TDI's sold everywhere in the world,
> > > have to use the EGR and
> > > CCV.
> > >
> > > Chris Thornton
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