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In a message dated 1/5/2002 1:48:34 PM Pacific Standard Time, gwbraly@gami.com writes:

<<<...You need several things to get these engines to operate smoothly, most importantly:

   1) Uniform AIR distribution across a reasonable range of RPMs;
   2) Uniform FUEL distribution;
   3) Reliable-uniform ignition without cross firing, etc...
   4) Balanced rotating components.
   5) Sufficient total fuel/air charge of sufficiently uniform distribution so that the natural statistical variation in burn times is minimized....>>>

BUT even when you achieve ALL of the above, by virtue of the fact that the ignition AND combustion processes are non-deterministic, a population of peak pressure values, collected in continuous real time on A SINGLE CYLINDER, will have a skewed statistical distribution (don't remember the type; see writings of Paul Puzinauskas). ie, not the same from cycle to cycle even in the same cylinder.

Jack Kane

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