Re: How to accelerate at the lights

Nate Nagel wrote:
Nate Nagel wrote:

gpsman wrote:

Matthew Russotto wrote:

In article <1145473880.447114.237720@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
gpsman <gpsman@xxxxxxxxxxxxxxx> wrote:

You've got the better of me again. How can a diesel always be pumping
it's full capacity of air at all times? Wouldn't it always have to be
at full throttle? How is the fuel metered between full-throttle and
idle if the air flow remains constant?



A Diesel doesn't have a throttle, Sparky.




Wellwhaddaya know... those stupid motherfuckers at Cummins actually
think they've manufactured one!

CUMMINS MERCRUISER DIESEL ANNOUNCES NEW QUANTUM SERIES ENGINE RATING:
QSC8.3-500

The QSC is compatible with CMD's new electronic throttle and shift
system (ETS). ETS is a fully electronic engine and transmission control
system.

I guess you could make some SERIOUS jack straightening them out... as
soon as you graduate 6th grade.
-----

- gpsman


Too bad he's right and you're wrong. If you'd posted a link I could have taken a look at whatever Cummins product it is you're looking at, but I would assume that they are actually using the word "throttle" in an incorrect sense, as it only correctly refers to a gasoline engine (or other spark-ignition engine) and is not applicable to a Diesel cycle engine.

http://auto.howstuffworks.com/diesel.htm

nate


Well, after some searching online, it appears that the term "throttle" is sometimes used in reference to Diesels; this seems incorrect to me because in school the term "throttle" always referred to an air control, but it seems like it's sometimes colloquially used to refer to a fuel metering mechanism on a Diesel. In any case, except as an emergency shutoff device, an air metering device is NOT used in a Diesel engine. As has been stated repeatedly before, a Diesel engine is always pumping its full volume of air through it at all times. This is possible because the engine does not rely on a spark to ignite the fuel/air mixture and therefore can maintain combustion at much leaner mixtures than can a SI engine.

Here's an ad for an exhaust brake that contains something of an explanation (not to mention the use of the word "throttle" to refer to fuel control...)

http://www.bankspower.com/tech_howexhaustbrakeworks.cfm

and a quick primer on Diesel vs. gasmotors in general...

http://www.bankspower.com/Tech_todaysdiesel.cfm

nate


Dang, I must like replying to myself... another pet peeve, Diesel is *always* capitalized as it is the family name of the inventor of the engine (Rudolf Diesel.)

nate

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