Talk:Exhaust gas recirculation

message: "environmental impact of EGR outweighs the NOx emission" in the last paragraph does not make sense.  NOx emission is an environmental impact.  —Preceding unsigned comment added by 69.224.45.140 (talk) 16:52, 15 March 2009 (UTC)
replies: text: I was also looking at that, NOx is also a greenhouse gas that takes more than 100 years to break up fall out of the atmosphere. Found a source here: http://www.umich.edu/~gs265/society/greenhouse.htm   —Preceding unsigned comment added by Waterppk (talk • contribs) 14:17, 29 July 2010 (UTC)
thread_title: Needs rephrasing

message: It's my understanding that the addition of exhaust gas also increases the mass of gas in the cylinder at part throttle during the compression/power strokes. This increases the compression ratio at part throttle. This increased pressure improves the thermodynamic efficiency. (Warning, I'm not a physicist, just a motorsickle sumbitch). I think this effect in not trivial.
Also, the heat rejection bit could be elaborated. Because the peak temperature of the combustion gasses is lower, the entire engine runs cooler. Usually, the manufacturer/designer uses an engine thermostat that's a little higher temperature to ensure the engine stays warm enough to keep the fuel vaporized, keep water vaporized, and further improves heat rejection by reducing the temperature differential between the exhaust gas and the cylinder head.
Finally, it might be helpful to dispel the idea that EGR is an attempt to 'reburn' unburnt exhaust gasses. This is the most common misperception about EGR and the main reason that uninformed guys with tools remove EGR systems.
Pcmenten 22:08, 29 December 2006 (UTC)
replies: text: So, if EGR hurts fuel economy in order to reduce harmful emissions, how is that helpful? Surely you then have to buy fuel more frequently to offset the reduction in fuel economy, thus producing more emissions. Just curious, because I'm thinking of blocking the EGR valve off on my '91 Shogun[/Pajero/Montero]. ahpla 17:17, 13 September 2007 (UTC)
thread_title:  EGR: other benefical effects 

message: The Technology Barnstar
		I can't see a single editor who wrote most of this article so I'm awarding the entire EGR editing team a barnstar.  The information on this page got my wife's Mazda running this morning and won me major skillz points!  I owe you one! SteveBaker (talk) 15:22, 12 December 2007 (UTC)
thread_title:  Team Barnstar! 

message: at the time of this talk comment thier are no online references for this article , only 2 books.  —Preceding  Kateweb (talk • contribs) 02:09, 29 July 2010 (UTC)
replies: text: There needn't be any online refs. The criteria for refs are laid out in RS. Books are fine. —Scheinwerfermann T·C08:39, 5 February 2011 (UTC)
thread_title:  Needs online References

message: Although it wasn't designed as such, Exhaust pulse pressure charging is probably a form of Exhaust gas recirculation. Biscuittin (talk) 22:01, 27 April 2015 (UTC)
replies: text: EGR doesn't just mean that exhaust gases are recirculated, it means that their recirculation leads to a drop in peak combustion temperature. Crossley's EPPR doesn't do that, in fact it would tend to the opposite. Andy Dingley (talk) 22:28, 27 April 2015 (UTC)
thread_title:  Exhaust pulse pressure charging 

message: Does anyone know the peak temperature that is generated with, and without EGR?  That is NOx generating temperture? There is discussion in RP-1 about NOx generation from rockets. Gah4 (talk) 18:02, 6 August 2020 (UTC)
replies: text: From this EPA paper it seems to be 1300C is the magic temperature that you want to stay below. Gah4 (talk) 19:31, 6 August 2020 (UTC)
thread_title:  temperature