[Vwdiesel] Rabbit 1984 Diesel Turbo ( getting somewhere now )

[Nate Wall]

Another thing here is the soot level. Many years ago I
read an SAE paper that determined diesel soot was
abrasive, and the more the engine was overfueled, the
shorter its life was from soot wear.

--Nate


--- "Tyler \"Casioqv\" Backman" <casioqv at usermail.com>
wrote:
> The fuel limiter diaphragm (what the hose goes to)
> limits fuel when not
> in boost, to prevent excess fueling. Manifold
> pressure presses on the
> diaphragm, which, through a very complex set of
> linkages, moves the
> "control sleeve" away from the "control channel"
> allowing more fuel to
> flow into the distributor piston, and causing more
> fuel to flow to the
> injector currently being fired. The fuel flow
> (smoke) screw does the
> same thing, but it's effect is constant, not in
> relation to manifold
> pressure. I would be careful to make sure that your
> motor isn't getting
> too much fuel (even if you get the smoking to stop
> or reduce). This is
> from the volvo factory repair manual for the VW
> turbo diesel inline 6:
> "Prolonged excessive enrichment will not increase
> power output but will
> in fact reduce service life of engine considerably.
> Even moderate
> enrichment of air/fuel mixture will sharply increase
> exhaust gas
> temperatures and combustion pressures without any
> corresponding power gain."
> Apparently, too little fuel doesn't hurt longevity,
> but reduces power
> output. Perhaps it would be a good idea to install a
> pyrometer, and
> measure exhaust gas temperature to get your fuel
> delivery correct? Does
> anyone know another way to find the correct
> enrichment adjustment?
>
> -Tyler
>
> H .Hagar wrote:
>  > This is a multi-part message in MIME format.
>  > --
>  > [ Picked text/plain from multipart/alternative ]
>  > Pulled  little rubber hose of intake manifold.
> Great improvement.
> What exactly does diagfraghm do to pump ???.
>  > Then started on fuelling screw.   Trying to get
> the black smoke on
> booting it down. More fuel is counterclockwise ?.
>  > Tricky little devil ---that screw. Small
> adjustment make a
> difference. (use it as excuse for a little joyride
> He he ).
>  > Not like a gas needlevalve   3 turns or so,
> remember ?.
>       Hagar.
>
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