Stan Prevost wrote:

: wrote in message
: ...

: While it's true that running LOP reduces
: CO emissions, it *increases* NOx emissions. With the higher EGTs and
: excess O2 running LOP, more of the O2 react with N2 in the mixture to
: create NOx's.

: Higher EGTs? 50 deg LOP is same EGT as 50 deg ROP.

Higher EGT's than running rich. Yes, 50 ROP is the same as 50 LOP
by definition, but when rich, there's no more O2 to react and make NOx. I
was actually referring to peak vs. ROP with regards to EGT, but it doesn't
matter all that much. 1450 or 1500 isn't much difference, as they're both
hot as hell. It'll make the exhaust stack glow a nice orange, unless it
gets enough air cooling.

In any event, it's the excess of O2 with high EGT's (close to
stoichiometric burn) that'll make lots of NOx. With all that O2, most of
the CO will be CO2 instead.

-Cory



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