Quote:
Originally Posted by PaleMelanesian
...Good on them for testing all the exhaust gases, too. Though the bikes were more fuel efficient (and the aero bike was best of all), the other emissions (hydrocarbon, CO, NOx) were much higher - 5+ times worse...
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I don't have access to the episode in question, were the other emissions as a percentage of exhaust gas volume or absolute figures? Because a large displacement single occupant vehicle can easily put out more than 5x the exhaust volume of a small commuter bike. Heck, any engine more than 1250cc can put out more than 5x more exhaust than my 250gs.
Folks who care about the other emissions do also need to care about engine displacement (and vehicle weight/drag), no? Though I would consider retrofitting a cat converter all the same if they were available/affordable. Were any bikes fuel injected with O2 feedback? Most bikes on the road aren't yet, but might be a good "mod" if you want to put a dent in emissions too.