Cold running diesels - EGR disabled?

T16 · 18th January 2012, 08:18

Here's a thought...

All the people with an EGR Bypass, are they going to have a colder running engine in winter, as the hot exhaust gases that the EGR mixes with the fresh air are not being fed into the engine?

Jakg · 18th January 2012, 08:26

Yes, and no - remember the EGR actually helps to lower combustion temps.

The air itself is hot, but the overall combustion is colder.

Mike Noc · 18th January 2012, 08:29

Nope. Funnily enough adding exhaust gas to the engine lowers the combustion temperatures, which is why it is done, to reduce Nox emissions.

Mike

rovexCDTi · 18th January 2012, 09:21

I also notice that the exhaust smells nicer since the EGR bypass.. Im strange like that though.

Mike Noc · 18th January 2012, 10:07

Mate don't go revving it whilst sniffing as its more poisonous without your EGR.

Mike

rovexCDTi · 18th January 2012, 11:29

Well im not one of those car 'lovers' (if anyone saw that documentary...

), but i can notice the difference if the wind is in the right direction. Its sweeter smelling.

18th January 2012, 08:18	#1
T16 I really should get out more....... ZT CDTi 135, ZT260SE Join Date: Feb 2011 Location: Dundee Posts: 2,877 Thanks: 10 Thanked 331 Times in 213 Posts	Cold running diesels - EGR disabled? Here's a thought... All the people with an EGR Bypass, are they going to have a colder running engine in winter, as the hot exhaust gases that the EGR mixes with the fresh air are not being fed into the engine?

18th January 2012, 09:21	#4
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	I also notice that the exhaust smells nicer since the EGR bypass.. Im strange like that though. __________________ [SIGPIC][/SIGPIC]

18th January 2012, 11:29	#6
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	Well im not one of those car 'lovers' (if anyone saw that documentary... ), but i can notice the difference if the wind is in the right direction. Its sweeter smelling. __________________ [SIGPIC][/SIGPIC]

18th January 2012, 08:26	#2
Jakg This is my second home N/A Join Date: Feb 2010 Location: Suffolk Posts: 6,867 Thanks: 0 Thanked 397 Times in 302 Posts	Yes, and no - remember the EGR actually helps to lower combustion temps. The air itself is hot, but the overall combustion is colder.

18th January 2012, 08:29	#3
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Nope. Funnily enough adding exhaust gas to the engine lowers the combustion temperatures, which is why it is done, to reduce Nox emissions. Mike

18th January 2012, 10:07	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Mate don't go revving it whilst sniffing as its more poisonous without your EGR. Mike