Will,
I sense a little anger. This thread was on its way to becoming PWCs are the source of all the worlds pollution problems, I just simply pointed out that TODAY'S production boats are not as clean as everyone thinks they are. While there are always exceptions to the rule, a 3 liter EFI four stroke boat motor is going to produce less pollution than an 8.1 liter EFI four stroke boat motor when run the same distance. Notice the chart I posted listed the pollutants as grams per kilowatt hr. This could easily be converted to grams per horsepower hour (sorry about mixing measurement systems). The point is that generally the more horsepower, the more pollution is produced for a particular engine type.
Diesel engines are the king of pollution producers as far as I'm concerned, considering HC, NOx, and CO. New injection schemes are an improvement but there is still a long way to go and changes are coming. One of the things that makes diesel more effecient also causes more pollution (high compression).
I suspect that one of the technical challenges with catalytic converters is the extreme heat they generate and high temperatures they run at. Not a problem hanging below your car, but an issue in a closed engine compartment. I think catalytic convertors in boats are long overdue, in both gas and diesel applications.
Finally I don't agree with your comments on "NH people" except for a small, usually vocal minority, most of "NH people" are neighborly, nice people who have no problem with there MA and other area neighbors.
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