http://london-lez.org/fuel-emission/what-percentage-of-car-exhaust-is-unburnt-fuel Tue, 22 May 2012 05:22:01 +0000 http://wordpress.org/?v=2.7 hourly 1 http://london-lez.org/fuel-emission/what-percentage-of-car-exhaust-is-unburnt-fuel/comment-page-1#comment-3973 clausiusminkowski Sat, 31 Oct 2009 06:53:59 +0000 http://london-lez.org/fuel-emission/what-percentage-of-car-exhaust-is-unburnt-fuel#comment-3973 It really depends upon whether the engine is burning a 'rich' or a 'weak' mixture of petrol and air. A mixture about 10% rich in fuel gives the most power, whilst the most efficient running occurs with a weak mixture. Unburnt fuel in the form of carbon monoxide occurs in either case but with a weak mixture there is very little CO; a rich mixture, on the other hand, can give rise to as much as 3% unburnt CO.<br><b>References : </b><br> It really depends upon whether the engine is burning a ‘rich’ or a ‘weak’ mixture of petrol and air. A mixture about 10% rich in fuel gives the most power, whilst the most efficient running occurs with a weak mixture. Unburnt fuel in the form of carbon monoxide occurs in either case but with a weak mixture there is very little CO; a rich mixture, on the other hand, can give rise to as much as 3% unburnt CO.
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