Hello David, Zeke. The problem with diesel engines is that it until now has been difficult to mix the fuel and the air into a homogenous mixture. Gasoline (or even ethanol that matter )are much more voilate and mixes more easily with air. The black diesel smoke occurs when there is local oxygen shortage in the cylinder. As for acceleration and increased load conditions, the pump is supplying fuel in order to compensate for the higher demand for extra fuel. The main idea behind the high pressure common rail systems is that the injection time is much more rapid and that smaller drops of the fuel is created, which brings two advantages: The extra time "surplus" allows the fuel to mix better with the air, The smaller fuel drops also mixes more easily with the air. So, the problem with slow and black smoking diesels is practically gone with the high pressure injection systems
Jan Warnqvist AGERATEC AB ----- Original Message ----- From: "David Miller" <[EMAIL PROTECTED]> To: <Biofuel@sustainablelists.org> Sent: Friday, September 16, 2005 12:30 AM Subject: Re: [Biofuel] Debatable statement? > Zeke Yewdall wrote: > > >"One major way acceleration hurts is that engines are set to richen the > >mixture during hard acceleration in order to prevent detonation > >(knocking, pinging) at high cylinder pressures." > > > >Does this apply to diesel engines which almost always operate with > >excess oxygen? > > > > > Not if the diesel is setup properly. When the black smoke (soot) starts > coming out it's because there's not enough oxygen for all the fuel. > Short of that you're all set. > > --- David > > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
