[Vwdiesel] Crappy fuel? (was Touareg)

[Nate Wall]

I remember old gas motors having draft tubes. They also had an air filter
incorporated into the oil filler cap on a valve cover to equalize pressure in the
crancase to prevent dirt being sucked into/past the engine seals.

--Nate

Nate Wall wrote:

> I ran a draft tube on the '85 Jetta TD for about half a year to see if the
> oil in the intake stopped since I thought the turbo might be leaking it (it
> did stop, so it was blowby vapor in the intake), but after about 6 months
> when adjusting the valves, I noticed a gritty substance on the innards of the
> cylinder head, very noticeable, where the oil circulates. After this, I
> disconnected the draft tube (about 5 feet of 7/8 inch heater hose w/ a copper
> 90 elbow on the bottom, cut off at a 45 degree angle). I then carefully
> studied the draft tube set-ups on heavy-duty diesel engines at truck shows
> and by talking to design engineers (I worked w/ truck manufacturers at the
> time). There is a filter on engine block where the draft tube comes out to
> prevent dirt from getting into the engine. My thought is that dirt and sand
> either migrated up the draft tube and into the motor, or was sucked past the
> engine seals due to negative pressure in the crancase. At a 70 MPH higway
> speed, this could be substantial. I can't recall if I removed the pressure
> regulator when I put on the draft tube (I think it prevents this neg.
> pressure from the turbo sucking air past the breather opening in the intake
> boot). Well, after I re-installed the breather to factory specs, end of
> gritty stuff in the cylinder head. W/ that draft tube, you have an open
> system. This may not be good.
>
> --Nate
>
> TexasTDI wrote:
>
> > I quickly and cheaply solved my EGR and CCV problems.  Using VAG-COM I
> > adjusted the EGR so it doesn't activate as often.  And I disconnected the
> > CCV so that it vents into the air instead of my intake.  I need my TDI to
> > last as long as possible with minimum maintenance.
> >
> > 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 11:47 AM
> > Subject: Re: [Vwdiesel] Crappy fuel? (was Touareg)
> >
> > > great explaination,  that makes tons of sense, you are
> > > talking about a lot of motor re-working if you want
> > > that same production motor to run in the US.
> > >
> > > Thanks, Bryan
> > > 82 Westy Diesel 1.9 NA
> > >>
> > > --- TexasTDI <TexasVWdriver at hotmail.com> wrote:
> > > > Our higher sulphur diesel won't allow us to use the
> > > > same catalytic
> > > > converters and particulate traps that Europe does.
> > > > But the main reason the
> > > > EGR and intake get clogged up is because the EGR
> > > > lets in sooty exhaust into
> > > > the intake and the CCV lets in oily vapors from the
> > > > motor into the intake.
> > > > Add these two together and you get a clogged intake
> > > > and EGR.
> > > >
> > > > Chris Thornton
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