Water cooled EGR - Page 2

tareim · 12th December 2013, 00:27

Quote:

Originally Posted by Jakg

I'm fairly sure they are all water cooler

I also don't think the EGR helps warm the engine up - at very low temperatures (-10°C or lower iirc) it stays open the whole time to increase temps but in normal conditions and with normal opening it should actually reduce combustion temps.

the EGR is primarily there to reduce NOx emissions, the temp reduction is a bonus though how much it lowers temp idk

James.uk · 12th December 2013, 01:08

Do'hh,

my car has the water jacket on the EGR..

...

75driver · 12th December 2013, 07:10

Quote:

Originally Posted by HarryM1BYT

Not sure, but I think the water cooling was limited to either the autos or the PPD production. It wasn't about cooling the EGR gases, but about heating the coolant water a bit quicker.

In which case an egr bypass may not be such a good idea, if you want the car up to temperature as quick as possible?

tareim · 12th December 2013, 08:24

Quote:

Originally Posted by 75driver

In which case an egr bypass may not be such a good idea, if you want the car up to temperature as quick as possible?

Its a trade off between quicker temps or slightly more performance as when the exhaust gas has been passed back into the combustion chamber there is a lot less oxygen available to combust resulting it less performance than if there was no egr

Conkerman · 12th December 2013, 08:54

But a diesel engine is nowhere near stoichiometry, so that's not quite the case.

EGR is basically a diluent gas containing a large quantity of water vapour, it is basically in inert heatsink for the gas charge in the cylinder, reducing peak temps and thereby reducing NOx.

EGR operates at low-moderate load (over the NEDC operating range).

billjo · 12th December 2013, 18:54

Thats easy for you to say

DMGRS · 12th December 2013, 19:11

As long as they're kept clean, the EGR doesn't tend to cause too many issues on our cars (save for clogging up the inlet manifold).
I've actually reconnected mine, as I found I had the water-cooled EGR. I hit middle on the temp gauge after just a few miles, and noticed this increased a lot with the EGR disabled.

rich17865 · 13th December 2013, 18:35

I was under the impression the water cooled egr pipe was fitted solely to the diesel automatics.

Either way, if you have one get the bleed screw replaced as they degrade and rot. Mine leaked, and as the pipe gets hot it evaporates and you never notice.

12th December 2013, 19:11	#17
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	As long as they're kept clean, the EGR doesn't tend to cause too many issues on our cars (save for clogging up the inlet manifold). I've actually reconnected mine, as I found I had the water-cooled EGR. I hit middle on the temp gauge after just a few miles, and noticed this increased a lot with the EGR disabled. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

12th December 2013, 01:08	#12
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Do'hh, my car has the water jacket on the EGR.. ...

12th December 2013, 08:54	#15
Conkerman Regular poster Seat, Volvo and other animals. Join Date: Nov 2013 Location: Oxon. Posts: 37 Thanks: 0 Thanked 2 Times in 2 Posts	But a diesel engine is nowhere near stoichiometry, so that's not quite the case. EGR is basically a diluent gas containing a large quantity of water vapour, it is basically in inert heatsink for the gas charge in the cylinder, reducing peak temps and thereby reducing NOx. EGR operates at low-moderate load (over the NEDC operating range).

12th December 2013, 18:54	#16
billjo Passed Away Rover 75 tourer club se Join Date: Nov 2008 Location: Lancashire Posts: 80 Thanks: 0 Thanked 5 Times in 5 Posts	Thats easy for you to say

13th December 2013, 18:35	#18
rich17865 This is my second home Transit Connect Join Date: Feb 2011 Location: Crewe Posts: 9,532 Thanks: 868 Thanked 1,619 Times in 1,095 Posts	I was under the impression the water cooled egr pipe was fitted solely to the diesel automatics. Either way, if you have one get the bleed screw replaced as they degrade and rot. Mine leaked, and as the pipe gets hot it evaporates and you never notice.