To Big Dave & ConnClark:
I did today a quick,
non-scientific, research about your comments.
I couldn’t find any document proving what you claim.
I recommend to start with (if you like to read a lot):
Diesel particulate filter - Wikipedia, the free encyclopedia
Diesel particulate matter - Wikipedia, the free encyclopedia
NIOSH Document: Examination of Diesel Aftertreatment Systems at NIOSH Lake Lynn Laboratory, Mining ID: 2604 | CDC/NIOSH
http://www.cdc.gov/niosh/mining/pubs/pdfs/eodas.pdf
And as last: this interesting 24 pages long study, which its conclusion is:
>>
From all we know today, we can confidently say that reducing diesel exhaust in our environment
will mean improving public health, and as this report demonstrates, reducing preventable premature
deaths. We do not need to wait. Technology is available today that can reduce particulate matter emissions by up to 90 percent. Now is the time to clean up our old trucks, buses, heavy equipment and
locomotives to provide a cleaner future for us and our children.<<
Source: Howard Frumkin, M.D., Dr.P.H., FACP, FACOEM
Professor and Chair, Department of Environmental and Occupational Health
Emory University, Rollins School of Public Health
http://www.catf.us/publications/repo...in_America.pdf
Question for ConnClark:
If it’s true what you say about the ultra fine particulates, can you quantify how much of these are produced by a DPF in comparison to a non-filtered vehicle? More, same, less ?
I would appreciate a scientific document (please no biased WebPages or forums).
For Big Dave:
Quote:
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It is not needed. The air quality in the US is the best in living memory.
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If you introduce a large number of Diesel cars, without DPF, your air quality will soon get worse. I know it by experience. Or take a look to the map in:
Diesel Retrofit in Europe and examine northern Italy.
Quote:
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Any filter induces back pressure. Turbo-diesel efficiency is VERY sensitive to back pressure. Back pressure reduces MPG.
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Ok, but this can be overcome by more efficient engines.
For instance my 2002 TDI common rail with no DPF has “only” 150 Hp.
Today’s same engine has 177 Hp and less consumption although it has a DPF.
Engines get more complicated with the time, but new technologies compensate this.
This is just my 2-cent opinion.
