I have not. I haven't done anything with the car, yet. Life gets in the way, sometimes. Without going into the boring details, my E300 had to a back seat for a while. Glad I have the 240D which I use for my work commute.

Never, in my wildest dreams, would I have guessed the legs this thread has grown. I'll have admit, I'm still a bit nervous about the whole thing. Doesn't seen like I have much choice, though. I'm gonna remove the over head pipe first, run it like that, and see what I can see.

Hopefully sooner, rather than later....

Pictures or it never happened......

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

Hey, let me try to show an example how air could be moved and zero vacuum be created…

Ok, in order for a cylinder to fill with air, it merely has to have the piston move out of the way, and atmospheric pressure maintains the volume with air.
Take the top off a canister, and it is full of air. No vacuum needed. Push the bottom of the canister, and the air pushed out… move the bottom back, and the air stays with it, refilling the canister…
You would only produce a partial vacuum if the bottom moved and the top had a restriction, so the atmosphere couldn’t rush in immediately… I would say that intake valves qualify as restrictions… as do intake ports… both are smaller than the cylinder… ergo, restrictive. So, INSIDE the cylinder, a partial vacuum exists… the intake runner in the head would be an airflow plenum, and smaller than the piston cylinder volume, so also a restriction, again, partial vacuum…

On a gasoline engine, the intake valves overlap in time with the piston drop, maintaining a constant vacuum in the intake behind the throttle plate…

A traditional Diesel engine has different valve timing, and opens as the piston begins dropping… so, the vacuum is far less than in a gasoline engine.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Are you talking about otto cycle, atkinson cycle or miller cycle? What about BMW's Valvetronic or Fiat's MultiAir that don't use a throttle but widely vary intake timing/duration to throttle the airflow into the cylinder?





Except with Mercedes OM engines, where the valve overlap and intake opening timing is different between turbo and non-turbo, and even year to year.


Blanket statements do not fit well in discussions.

Venturi effect