> Once I've got the obvious stuff done on my bus, I'm going >to look into a catalyst retrofit. Of course, the aircooled engine >runs richer than watercooled, so the catalyst will have to >burn-off that fuel, and the CO produced by the rich mixture too. >Maybe it won't be practical, maybe I'll lose horsepower, but >I read once of someone trying to commit suicide with a catalyst >equipped car, and after 2 hours they gave up and decided to live! >I've got the typical header system now- that might give me short enough >pipes on cylenders 2 and 4 to get the catalyst hot enough to work. Good luck, but I'd be dubious about the life span of a catalyst on an air cooled engine without fuel injection. Also, if the engine isn't running very close to stoichiometric the catalyst will do a poor job on either VOC's/CO or on NOx, or both, so you're going to run into a tradeoff between catalyst efficiency and reduced engine life by leaning out the carbs. I recently saw a copy of a 94 Mexican sales brochure. The beetle has closed loop (O2 sensor) fuel injection and a catalyst, however, a contact at Environment Canada claims that the cold start emissions from the air cooled motor are all still over the place.
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