Exhaust-Gas Recirculation, Glossary and Terms, Automotive, Motorcycle, Boat Dealers
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"Exhaust-Gas Recirculation"
EGR is a method of reducing NOx (oxides of nitrogen) exhaust emissions by recirculating some of the engine's exhaust gas into the intake manifold. The exhaust gas serves as inert filler that absorbs heat during the combustion process and reduces the peak temperature reached during combustion.