[Vwdiesel] Brakes --- engine brakes -- ( The physics of it ).

[Sandy Cameron]

At 08:07 AM 1/10/04 -0800, you wrote:

>Loren said that some Mercedes diesels have a butterfly valve (news to me)
>so if we find out why --- it may give the answer. Loren what operated your
>Mercedes butterfly ?   I remember your dads Mercedes for its infected fuel
>tank.

I drove a 200D for 20 years (bought it new in 1968). It had 2 butterflys,
one gravity/airflow operated, the other linked by ball-end rods (like the
volks shifter) to the "throttle" pedal/injection pump speed control.The rod
went across the top of the valve cover.
The linkage would open both positively when the pedal was pushed.

I would guess the gravity one would allow some air ingestion when coasting
down hills with throttle off. 
I was curious why the throttle operated one was there, and if I opened it
manually while idling, the engine would stumble. Never persued it farther
than that.

The rod went across the top of the valve cover.

What a beautifull engine that was, but not a good cold weather starter.
Crappy hairpin glow plugs wired in series,forever burning out. One goes,
they all go, like cheap Christmas tree lights . Manual glow plug timer, hold
the knob out untill the dash indicator was red enough to light a big cigar
then start.

Real timing CHAIN, no rubber bands. In line bosch pump (little piston for
each cylinder) looked like a tiny engine.

Sandy