Emission Gases Explained
Pt.1
Pt.2 /
Pt.3 / Pt.4 /
Pt.5
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The following table
lists some of the results possible when the AFR
(air-fuel ratio) is sustained at conditions ranging from
too lean to too rich.
|
Conditions |
Results |
| Too Lean |
Poor engine power
Misfiring at cruise speeds
Burned valves
Burned pistons
Scored cylinders
Spark knock or ping |
| Slightly Lean |
High gas mileage
Low exhaust emissions
Reduced engine power
Slight tendency to knock or ping |
| Stoichiometric |
Best all-around
performance |
| Slightly Rich |
Maximum engine power
Higher emissions
Higher fuel consumption
Lower tendency to knock or ping |
| Too Rich |
Poor fuel mileage
Misfiring
Increased air pollution
Oil contamination
Black exhaust |
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