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Date: Sun, 09 Oct 2005 01:52:07 +0100
From: Pooh Bear <rabbitsfriendsandrelationsnospamail.com>
Subject: Re: SAAB Bi-Power


MH wrote: > > Is your thinking about banning diesel based on the particulates they make ? > > Yes, specially in urban areas. (Sulphur in diesel fuel is a problem too.) > > > I've heard that bio-diesel is much better in this regard too. > Yes, about 65% reduction of particulates, but it produces more nitrogen oxides > (NOx), which can be cured with a catalytic converter, but Diesel engines usualy > do not have a cc because of the high sulphur content (which makes a cc useless). > > The 'best' fuel (relatively, of course) is hydrogen and oxygen, but LPG is > environmentally friendly as well. > > To get some more SAAB content; my '79 96 runs both on LPG and petrol. I once did > a test with a portable GC on its exhaust, running on LPG and then running on > petrol, see http://members.home.nl/saab96/techtip/96GC-LPG.jpg > > The LPG graph (left) is a flat line; no hydrocarbon emisions, while the petrol > graph (right) clearly shows peaks of benzene, toluene and xylene. Good point. Petrol's a bugger to burn cleanly since it's made up of so many different molecules. In comparison a 'pure fuel' does much better. Alcohol should be very good in this regard too. I wonder if part of the reason for E85 rather than pure alcohol is to get some fuel system lubrication from the oil based content ? Graham

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