jkp
Member Since: 17 Sep 2005
Location: Living among Bawbags
Posts: 4528
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Does anyone have or can point me in the direction of a drawing of the EGR valve and how it fits within the engine setup. Ideally a PFD or simplistic P&ID style drawing would be great.
I just really want to get my head round their purpose and how work in the big picture. I've done a search but cannot find anything.
Ta.
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 4th Nov 2008 11:17 pm |
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jkp
Member Since: 17 Sep 2005
Location: Living among Bawbags
Posts: 4528
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NoDo$h wrote:Generic synopsis here
http://en.wikipedia.org/wiki/EGR
Cheers Big Ears 
Some light evening reading 
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| 4th Nov 2008 11:23 pm |
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Adiver
Member Since: 18 Jan 2006
Location: Rutland
Posts: 492
  
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jkp wrote:
I just really want to get my head round their purpose and how work in the big picture.
Basically it makes the engine sniff its own farts.
What more do you need to know?
Its not pleasant - I wouldn't reccomend it and I dont see why the loverly V6 should have to do it either!
 D4 SDV6 HSE
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| 4th Nov 2008 11:23 pm |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18457
  
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Adiver wrote:Its not pleasant - I wouldn't reccomend it and I dont see why the loverly V6 should have to do it either!
Emissions - exhaust gas is "inert", and very good at absorbing heat. So it reduces combustion temperatures, which lowers NO and NO2 production which is critical to meet emissions legislation  06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
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| 4th Nov 2008 11:29 pm |
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Adiver
Member Since: 18 Jan 2006
Location: Rutland
Posts: 492
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Martin wrote:Adiver wrote:Its not pleasant - I wouldn't reccomend it and I dont see why the loverly V6 should have to do it either!
Emissions - exhaust gas is "inert", and very good at absorbing heat. So it reduces combustion temperatures, which lowers NO and NO2 production which is critical to meet emissions legislation
So it makes the farts smell more pleasant? Still smelling farts though, in my book! 
I am a little more appraised of what they do, just trying to make it basic to help understanding D4 SDV6 HSE
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| 4th Nov 2008 11:33 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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And it self-fouls with particulates. Which sucks. Or rather doesn't. I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 4th Nov 2008 11:33 pm |
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jkp
Member Since: 17 Sep 2005
Location: Living among Bawbags
Posts: 4528
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Is there a Diesel Particulate Filter in the loop to deal with the sooty deposits? I know a lot of diesel engines now use these to varying degrees of success. SEAT use one which needs extended runs >55mph to burn off contaminents, but if this is not done the unit needs to be changed at a cost of >£1k as the owner has not operated it correctly and not covered in warranty.
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| 4th Nov 2008 11:38 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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Yours doesn't. Mine does. 07 and later have DPFs and they come after the EGR. It's a EuroIV thing. I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 4th Nov 2008 11:40 pm |
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jkp
Member Since: 17 Sep 2005
Location: Living among Bawbags
Posts: 4528
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That's it, the excuse to get a new D3. I NEED a DPF 
Although after the EGR's does not do them any good. I take it that it's purely for emissions improvement.
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| 4th Nov 2008 11:42 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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Aye. I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 4th Nov 2008 11:44 pm |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18457
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DPFs are now required to lower particulate emissions to the latest emissions regs.
They are all similar - long motorway runs are required to allow them to get hot enough to burn off soot efficiently ("regenerate") to stop them filling up.
DPFs are monitored by the ECU to check the soot load, and if it goes above a limit the ECU can (depending on the manufacturer) request a quick drive to lower the soot level or tell the driver to get to a dealer who will put the vehicle into a special regeneration mode to clear the soot in the DPF.
If this is ignored the ECU will put the engine into reduced power mode to prevent further soot loading and damage to the DPF.
It would only need replacing entirely if it ended up completely full of soot, which could only happen if you did only very short journeys around town AND ignored ALL the warning lamps and/or messages to carry out a regeneration.
It's a great system, turns diesel exhaust pipes from horrible sooty black to spotlessly clean, but like catalytic converters they do require a little looking after! 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
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| 4th Nov 2008 11:48 pm |
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jkp
Member Since: 17 Sep 2005
Location: Living among Bawbags
Posts: 4528
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Very techy replies for 11pm on a Tuesday night.... 
Cheers
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| 4th Nov 2008 11:57 pm |
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stapldm
Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330
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NoDo$h, Was it all MY07 that got the DPF, or was this introduced partway through the MY? I'm asking 'cos I have an early MY07 and recall nothing at all in my manual about DPF, regeneration or any of the messages warning of a buildup that needs dealing with. Failing that, anyone know where I can look to see if I can eyeball it?
Thanks Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone?
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| 5th Nov 2008 12:21 am |
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