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To: Snowshoe who wrote (70029)	7/26/2008 1:15:32 PM
From: Maurice Winn	Read Replies (2) \| Respond to of 74559

Snow, catalytic converters are a way to clean up dirty exhaust by burning it. It's better not to produce the dirt in the first place. The way to do that is to have little lean burn engines with all mod-con electronic/photonic control system and fuel tailored for the application. The exhaust from little clean-burning engines running on good fuel is so clean that post-combustion processing is unnecessary. My dirty great Camry puts out a lot of muck when first starting because it runs at high fuel:air mixture and it takes time for the catalytic converter to light up to burn the highly aromatic fuel provided in NZ. The amount of catalyst in catalytic converters has dropped a LOT and it needed to or they'd now be absurdly expensive. They are too expensive still compared with what they achieve. The greatest thing which catalytic converters achieved was to get lead out of petrol. One of the great crimes of ignorance [though I believe some people were culpable] was to put lead in petrol/gasoline. It has not yet been recognized just how much economic and general damage was done by poisoning children for 30 years. It was about $10,000 x 400 million = $4 trillion, give or take a $trillion. Catalytic converters are about $500 a throw, [last time I checked long ago], plus fuel costs to run them [exhaust impedance] and capital destruction when non-complying [maintenance costs and scrapping cars which could keep running but for failed smog tests which properly designed cars would continue to pass]. Mqurice

To: Snowshoe who wrote (70029)	7/26/2008 7:33:33 PM
From: TobagoJack	Read Replies (1) \| Respond to of 74559

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