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Lean burn Natural Gas powered Reciprocating engine

Lean burn Natural Gas powered Reciprocating engine

Lean burn Natural Gas powered Reciprocating engine

(OP)
Does anyone know who can help me convert a Natural Gas powered Reciprocating Engine into a lean burning engine to reduce the emissions? I have a old Caterpillar engine that produces substantial amounts of NOx and CO and I need to reduce the emission in the area without replacing the whole engine with a newer model. What other economical methods could be used to achieve this?

Thanks,
Gavin Tweedie

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