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Our school just obtained a new fleet of school buses, powered by the Navistar MaxxForce diesel engines. After two months of regular service, the inside of each very large exhaust pipes is as clean as the day it was put together, that is, soot-free. I will add specifics regarding how this improvement was attained--sorry that I don't have it now. I did find out that this line of engines is using the very high pressure common rail injection system with up to five openings per each firing of a particular cylinder. User: HomeBuilding 75.39.248.115 ( talk) 01:48, 23 September 2010 (UTC)
Since my body won't let me work any more, and I've now been out of the business for over two years, I'm going to write a book on Catalytic Converters. I'm one of the few people who isn't in the business who qualifies as an expert, understands the chemistry, the physics, and how engines work. Because I worked in the business for over ten years, I have names in my rolodex for people who work at every company, to help me fill in the blanks.
Besides, after seeing some of the stuff that has happened on this page over the years, well you folks need a reference that you can use that is reliable. I'm posting this here because I know what I think should be in the book, but I don't know what you think should be there. What questions would you like to see answered? Let me know on my talk page.
I am intending to include a section on Diesel Oxidation Catalysts and Diesel Particulate Filters. UrbanTerrorist ( talk) 05:01, 22 September 2011 (UTC)
This is what the section looks like currently:
Fuel Economy
Particulate filters significantly* decrease fuel economy, which is why automobile and truck engine manufacturers have avoided the use of filter technology until now. citation needed Because an engine's carbon emissions are directly proportional to its fuel usage, an engine equipped with a diesel particulate filter may have up to twice the carbon emissions of an equivalent engine without a DPF.** citation needed Unlike the filtered particulate, carbon emissions (CO2) are considered greenhouse gasses which contribute to global climate change.
The motivation behind mandating DPF's in the USA was not to slow global warming, but instead to reduce visible smoke from exhaust gasses.*** citation needed By the time laws limiting diesel particulate went into effect in 2007, diesel engine technology had advanced to the point that modern engines produced no visible smoke (without the use of a DPF) except when cold or heavily loaded. citation needed
The wording seems a bit bias. But the IP user intentions are good.-- Dana60Cummins ( talk) 19:55, 4 October 2011 (UTC)
We keep getting people here asking questions about filters which the article isn't aimed at answering. I think that we need to add or at least have a place to send people. When I was still working in the industry, the best place I knew of was the Dieselnet Forums. UrbanTerrorist ( talk) 20:36, 16 October 2011 (UTC)
This is not a place for a forum. Nor is it a place to direct questions either. -- Dana60Cummins ( talk)
And I didn't mean to make this a forum, and I didn't mean to make it a place to ask direct questions either. What I did mean was to give people a place to go, so that we could get them out of our hair. UrbanTerrorist ( talk) 01:00, 19 October 2011 (UTC)
John Nevard, it's very clear you are not a fan of DPFs. It's your right to hold that opinion, of course, but it is not appropriate for you to weave it into articles on Wikipedia. I would really like to avoid having to report you for vandalism, but your persistent and willful introduction of assertions not supported by the refs you provide will eventually force my hand. Most recently, you have repeatedly ( [1] [2] [3]) inserted the assertion According to the UK's Automobile Association, DPF systems may not regenerate properly even on cars driven mostly on motorways. You have supported this assertion by reference to this page. However, that page does not support your assertion. The closest it comes is If you ignore the warning light and keep driving in a relatively slow, stop/start pattern soot loading will continue to build up until around 75% when you can expect to see other dashboard warning lights come on too. At this point driving at speed alone will not be enough and you will have to take the car to a dealer for regeneration. That supports my edit of your assertion, to wit, If the driver ignores the warning light and waits too long to operate the vehicle above 40 mph (64 km/h), the DPF may not regenerate properly. Please try to contribute in a more coöperative, less combative manner. Thanks. — Scheinwerfermann T· C 03:30, 26 October 2011 (UTC)
You're not paranoid, you're observant. It also happens on Exhaust gas recirculation. Astounding though it be, we still have ignorant morons babbling about how emission controls are stupid, unnecessary, advocated only by poopooheads, etc. — Scheinwerfermann T· C 04:25, 1 November 2011 (UTC)
I'm no expert on this matter, so can't really edit it. However, one thing I have noticed is that the history section is reasonably US centred. For example, I've found a British bill regulating all hydrocarbon fuels from 1973. If someone were to edit this section to include worldwide history on the matter it'd definitely improve the article. 86.139.165.241 ( talk) 18:51, 29 January 2012 (UTC)
I think it would be useful to include some information on the impact of Diesel particulate filters on the NO2/NOx ratio in the emissions. This has potentially quite an important effect on urban NO2 concentrations e.g. this article. There is an interesting policy challenge here - clearly both PM and NO2 are important pollutants. I would do it myself but I am tied up with rewriting aerosol at the moment.-- NHSavage ( talk) 16:32, 28 July 2012 (UTC)
Removed sketchy link:
Believed sketchy for reasons shown here (scam)
https://www.mywot.com/en/scorecard/airqualitycs.com
How is that chemically possible to oxidize ash?
See Talk:Motor_oil#SAPS regarding "sulphated ash, phosphorus and sulphur" (SAPS). Widefox; talk 00:10, 30 May 2018 (UTC)
I'm not enough of a gearhead to contribute here, but apparently removing DPFs is a thing now and popular enough to go by the (misleading) acronym "Diesel Emission Deleting" (DED). Probably worth a mention? Jpatokal ( talk) 12:29, 19 May 2024 (UTC)