Egr - Diesel Truck Forum -
Thread Details Posted by fordfanatic69, this thread has received 1 replies and been viewed 533 times.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 05-23-2006, 01:44 PM Thread Starter
fordfanatic69's Avatar
Join Date: Dec 2008
Location: Louisiana
Posts: 530
Points: 54,233
Thanks: 4
Thanked 2 Times in 2 Posts

Let me get this straight. The Egr lets the exhaust run back through to cool off some to lower the emissions. What this is doing is causing the coolant to flash boil and that is when the puking starts. If that is the case what the crap is going on with the coolant. Should it be replace everytime the truck is in the shop for the puking. I might be way off but that is just how I am understanding the problem.

09 F250 Crew Cab FX4
5% tint 35% whole windshield w/5% brow
4" lift
35X12.50R20 Toyo
Under cab Lights
Bed Lights
5" Flow Pro No Muffin W/6" tip
Spartan 310
fordfanatic69 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 05-23-2006, 04:58 PM
Join Date: Mar 2006
Posts: 150
Points: 547
Thanks: 0
Thanked 0 Times in 0 Posts
Your question may be better placed in another thread.

EGR "cools" the peak combustion temperature. Here is how it works.

When the fuel burns, it has a fixed amount of heat to release. If there is only air and fuel, all the heat warms the products of combustion, say up to temperture X

Now, adding exhaust gas as a diluent puts an inert material in the combustion chamber with the air and fuel. When the air and fuel burn, the heat released has to not only heat up the products of combustion, but also the inert exhaust gas.

So, the exhaust gas that has been recycled to the cylinder takes a "free ride" and sucks up some of the heat of combustion. This limits the peak temperature in the cylinder to a value that is below X.

It takes very high temperatures to "fix" (react) nitrogen. By limiting the peak combustion temperature, you reduce the tendancy to form nitric-oxides.

Now, the EGR is cooled before it gets to the cylinder by the cooler. This helps the EGR to flow and also makes the EGR denser so you can either get more in the cylinder or "compact" the EGR so that you can get more air/fuel in the cylinder.
Redneckmba is offline  

Quick Reply

Register Now

In order to be able to post messages on the Diesel Truck Forum - forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome