3F-2 - FUEL SYSTEMS 90-824052R3 JUNE 2002
As the air/fuel ratio becomes leaner, combustion
temperatures increase. Higher combustion
temperatures raise the NOx content of the exhaust.
But, enrichening the air/fuel ratio to decrease
combustion temperatures and reduce NOx also
increases HC and CO, as well as lowering fuel
economy. So the solution to controlling NOx - as well
as HC and CO - is to keep the air/fuel ratio as close
to 14.7:1 as possible.
OUTBOARD HYDROCARBON
EMISSIONS REDUCTIONS
8 1/3% PER YEAR OVER 9 MODEL YEARS
0
20
40
60
80
100
120
96 97 98 99 2000 01 02 03 04 05 06 07 08
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