> Hi J.D. > > Lively, civil and more! I'd love to see or hear of any specific > studies you've come across. Searching the internet yields mostly > articles about how, though clean-diesel has washed away some of the > dirty-diesel blues, diesel is still dirtier than gasoline. I'm not > stopping there though. Most of the works cite research done by Prof. > Jacobson from Stanford. (Sounds like it could be a case of having one > researcher's findings spread like a rumor, giving something a bad > name... like David Pimentel and ethanol production efficiency.) > > - Dave > Dave, to tell the truth, I'll admit that I have been too intellectually lazy to actually dig for this too much. I am surprised that Keith hasn't added his 2 bits here. IIRC, his position is that a catalytic converter will fix the problem of high NOx emissions. The reason this solution has not been used in the US too much is that #2 still has too much sulfur for these things and quickly ruins them, but biodiesel and ULSD will work with a Cat. I'm not sure about the particulates, but I have heard a lot about particulate traps. I do have a concern for the engine and especially for performance with cats and traps, and I could be wrong about this, but I'm concerned that the backpressure from these things might make the exhaust much too restrictive. IME it already is on most consumer diesels. Hope someone will add something more useful, J.D. > > --- In biofuel@yahoogroups.com, [EMAIL PROTECTED] wrote: >> > Hello, >> > >> > Excuse my ignorance, but I've heard something recently that I need >> > clarification on... >> > >> > Biodiesel is cleaner than diesel, but is it cleaner than reformulated >> > gasoline? (CO, NOx, PM, and HC) I'm talking tailpipe emissions only, >> > cause full life-cycle emissions obviously shows biofuel to be cleaner. >> > The increased fuel efficiency of diesel engines surely will throw this >> > thing wide open to debate, so a grams per mile basis seems > appropriate. >> > >> > There was a thread going on this earlier this month that seemed >> > unresolved. To respond to part of that thread, I've also heard of >> > people running E85 in their new Prius Hybrids (without conversion, >> > they must have a high compression, maybe 13:1). Anyone have more >> > information on this? >> > >> > Dave Shaw >> > >> > Dave, I think it has been conclusively proven that in a one to one >> comparison, even #2 diesel is cleaner than gasoline with respect to CO, >> and hydrocarbon emissions. Biodiesel removes 100% of diesels sulfur and >> a great deal of its soot, reducing black smoke and particulate >> emissions. The reformulated gas is probably cleaner in terms of NOx, >> almost certainly, but I'm sure you're aware of the debate on whether or >> not NOx is really that harmful. Of course it does cause smog in >> combination with sunlight, and high VOCs, but many people feel >> controlling VOCs is the better way to decrease smog and improve air >> quality. Some studies eevn suggest that smog will increase when NOx >> decreases unless there is a corresponding drop in VOCs. I really don't >> have the answers, but I still think the diesel will come out cleaner on >> most important measures especially with biodiesel or ULSD (like they >> have in Europe). On the particulate issue, that may be a problem, but >> some say that even gas engines release particulate matter, just a >> smaller finer particle. Others say that diesels are too dirty just >> because of the particulate emissions issue, that they can cause illness. >> It hasn't been proven to my satisfaction, but to others, it most >> certainly has. Hope it is a lively yet civil debate, >> J.D. >> > >> > >> > >> > >> > Biofuel at Journey to Forever: >> > http://journeytoforever.org/biofuel.html >> > >> > Biofuels list archives: >> > http://infoarchive.net/sgroup/biofuel/ >> > >> > Please do NOT send Unsubscribe messages to the list address. >> > To unsubscribe, send an email to: >> > [EMAIL PROTECTED] >> > Yahoo! Groups Links >> > >> > >> > >> > >> > >> > > > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Biofuels list archives: > http://infoarchive.net/sgroup/biofuel/ > > Please do NOT send Unsubscribe messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > >
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