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Originally Posted by Isaac Zachary
Maybe because of higher surface temps, but also because it would be hard to keep fresh air out of the exhaust.
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Not sure to which extent fresh air on the exhaust of a 2-stroke with direct injection would be much worse than unburnt mixture on either a carburettor-fed one, or even if either a TBI or port-injection were fitted.
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Three way catalytic converters work best at reducing NOx in an oxygen starved environment.
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Adding EGR to a 2-stroke engine would be as much of a PITA or even worse as for a Diesel engine.