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the displacement differences between any two different engines really has little to no direct correlation to the amount of their respective "dirty" exhaust emissions



Are we discussing the same thing, Dwight? Seems to me that a 5 liter motor that produces the same PPM NOx (for example) as a 1 liter motor is polluting five times as much.



I would have thought the emmisions from a gasoline engine would be relative to the amount of fuel burned over a given distance.

If a V8 car burns a gallon of fuel every 18 miles it must be emitting more pollution than a motorcycle using 1/2 a gallon over the same distance.

Correct me if I am wrong

FrankW Ex Speedmaster rider, went to the Dark Side now riding an America.