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Was: Moss/Lichen on roof, now we are into pollution.
Dave Plowman wrote:
In article , Nick Maclaren wrote: Worse, they work only after the engine has warmed up (about 5 miles) and the average trip in the UK is about 3 miles. This may have been true when they were first introduced, but modern types work much more quickly. FWIW, a cat doesn't rely on the engine temperature, but that of the exhaust gasses which are largely independent of this. Cat still takes a mile or two to get hot tho. Engine may take longer. During that time the engine will be running very rich, and the cat will allow huge amounts of unburnt fuel to spew out. When I reverse the car out first thing, the exhaust STINKS of benzene and other aromatics. |
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