On Thu, 28 Jul 2005 [EMAIL PROTECTED] wrote:
Now here's where I need a physics lesson. If indeed your engine has zero vacuum, how does the cylinder fill with air and fuel? Let's use real numbers, a 617.95 engine has bor/stroke of 90.9/92.4 and fills through a relatively small intake runner. This doesn't create a vacuum when the piston goes down to draw air in? There is no vacuum there? Without a turbo how would you get enough velocity to fill the cylinder?
So it creates a SLIGHT vacuum, not the 20+" HG that a GASOLINE engine would produce. If there is a measurable vacuum on a DIESEL engine intake there is a restriction in the intake (ie clogged air filter...)
If I remember right there was a guage in the lower part of the left most guage in the cluster of my 300SD that acted a lot like a vacuum guage. What is it measuring if not vacuum?
As others have said that is the economy gauge on later gassers. On a gasser vacuum is related to load, so you can base your economy off of that. Some people have converted the economy gauge into a boost gauge for the diesels, but that was a non factory thing.
Please set me straight on how the lambda system works if there is no vacuum in your engine. I thought that the drop in vacuum during acceleration on the upper chamber caused an imbalance and allowed the spring force to close the contacts which enriched the mixture. If there was no vacuum how does it work?
Lambda system? Never heard of it. I'm not a gasser expert by any means, but I believe that the contacts are for the ignition system? Diesels have no ignition. They compress the air to the point its so hot that the instant the diesel fuel is injected the diesel ignites.
I really think you're talking about gassers... If I remember the origial question was for a diesel, which your technique does not work as well on as diesels are not throttled. For gassers your technique is perfectly valid.
John '79 300SD
