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What do Rich-Burn or Lean-Burn Internal Combustion Engines (ICE) mean?

April 26, 2017combustion engines Ice Internal lean-burn mean rich-burn

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What do Rich-Burn or Lean-Burn Internal Combustion Engines (ICE) mean?

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Below are the definitions of each engine type as defined in Rule 1110.1: A RichBurn Engine is a spark-ignited, Otto-cycle or two-stroke engine that is operated with gaseous fuel as defined in Rule 431.1 and with an exhaust stream oxygen concentration of less than 4 percent by volume. A LeanBurn Engine is a spark-ignited, Otto-cycle or two-stroke engine that is operated with gaseous fuel as defined in Rule 431.1 and with an exhaust stream oxygen concentration of 4 percent by volume, or greater. If engine specification is not available, assume 4-stroke, lean-burn IC engine.