Air and Fuel are still in the combustion chamber. There will be a particualr volume of air and a particular volume of fuel in the combustion chamber. I a gas engine you want to keep it close to 14.7:1, in a Diesel it doesn't seem to need to stay at that ratio. Perhaps that don't worry about the volume of air to fuel in the combustion chamber with Diesel. The air and fule still need to mix in a Diesel, or there would be no combustion. I know they have creative ways of doing this.
I would imgaine that there would be a point where you would inject too much fuel directly into the combustion chamber and begin to loose power, much as a gasoline engine runs rich. Perhaps I'm failing to understand how fuel to air ratios on a gas engine work, thus my reasoning is off. But I still think what I'm saying makes sense. I'm failing to understand something somewhere. Someone is going to need to point out where my reasoning went awry so I can get the whole train of thought back on track.
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"You play the hand you're dealt. I think the game's worthwhile." -C. S. Lewis
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