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

[Tyler "Casioqv" Backman]

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.