From: Duncan Wood on 25 Mar 2010 06:38 On Thu, 25 Mar 2010 00:35:41 -0000, Rob <mesamine(a)gmail.com> wrote: > On 24/03/2010 7:42 PM, Mrcheerful wrote: >> Adrian wrote: >>> Rob<mesamine(a)gmail.com> gurgled happily, sounding much like they were >>> saying: >>> >>>>> Indeed. I also doubt that a vehicle with an egr has a carb... >>> >>>> Why? genuine question. >>> >>> Simply because fuel injection is an easier way to emissions benefits, >>> and started to become damn near ubiquitous before EGR started to be >>> particularly common. >>> >>> It's not impossible - my Saab has EGR, whilst 'erselfs 205 is the same >>> age and has a carb - but I just can't quite see it. >> >> in this case (the C3) it is very unlikely as it seems it is a diesel. >> >> > > That's why I asked as it may be confusing as to what is being referred > to as EGR. > > EGR was some of the first bit of pollution gear fitted and it was to > recycle the exhaust gas so more exhaust fuel had a second burn to reduce > the emissions. > > When injection engines came along the fuel being metered better reduced > the pollution with a more even and complete burn. > > Turbo engines operate differently again. > > There was a lot of unburned fuel down the exhaust when fuel was cheap. > Pre mid 70's era. > > Its been the development quite a few years now to comply with pollution > regulations. > > Could be wrong! > > r Yup, it's to reduce the formation of NOx by reducing peak combustion temperature, there's very little unburnt fuel in your exhaust. -- Duncan Wood
From: Adrian on 25 Mar 2010 13:53
Rob <mesamine(a)gmail.com> gurgled happily, sounding much like they were saying: > That's why I asked as it may be confusing as to what is being referred > to as EGR. > > EGR was some of the first bit of pollution gear fitted and it was to > recycle the exhaust gas so more exhaust fuel had a second burn to reduce > the emissions. > > When injection engines came along the fuel being metered better reduced > the pollution with a more even and complete burn. > > Turbo engines operate differently again. > > There was a lot of unburned fuel down the exhaust when fuel was cheap. > Pre mid 70's era. > > Its been the development quite a few years now to comply with pollution > regulations. > > Could be wrong! Umm, the engine I have with EGR is an injected turbo. EGR valves are notoriously troublesome on several recent common-rail turbo diesel engines. |