[Vwdiesel] Diesel octane or why can you run a diesel engine lean?

LBaird119 at aol.com LBaird119 at aol.com
Fri Mar 18 14:04:23 EST 2005

> Loren if you had read my threads carefully ---you wold understand that
> Lean comes in many shades. ---I chose SUPERLEAN  for good reasons.

  Indeed I've read your threads, all of them.  Yet the way you change 
speed on a diesel is to add more fuel where on a gas you add more 
air AND more fuel yet in the same ratios, basically always.  You 
can adjust that ratio and it then runs at THAT ratio.  In a diesel you 
maintain the air (of course excepting turbo, air density and all the 
variables) and change the fuel (A/F ratio) to change the speed.  
Thusly the A/F ratio is ALWAYS changing any time speed or load 
changes and you can't lean out that ratio and maintain speed and 
load.  You CAN increase the efficiency with adjustments.
Better injectors, light foot, higher pressures, dialing in the timing 
although have the effect of "leaning" things out and using less 
fuel isn't really running the engine lean, it's setting as many of the 
paramaters and variables to as close to ideal as possible.  
  Maybe it's just our definitions of the terms.

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