The egr valve is designed to reduce NOX....right? NOX is essentially heat. You reduce the NOX, or heat in the exhaust, by recycling burned exhaust gasses in the intake flow, thereby reducing the volatility of the mixture. The mixture wont burn as hot. Now, for the question.......why do people believe that deleting the egr reduces egts? Show me the correlation between lower egts, and egr deletion (why does it do it?)

 

THANK YOU!!! I am referring everybody that claims lower egt's by unplugging their egr to this post.

 

The computers in our vehicles were designed for EGR operation. The control relationships are very complicated. They most certainly take into effect mass air flow, fuel flow, air temperature, exhaust flow, intake temperature, assumed air humidity, and many more (I am assuming they are similar to how we control boiler and gas turbine combustion processes). The exhaust gas is recirculated so that the inert components (nitrogen, carbon dioxide, etc) provide a heat sink for the combustion process (lower flame temperature). Thus the exhaust temperatures are lower with an EGR and this results in reduced NOx - just as vloney states.

Take away the exhaust recirculation and exhaust temperatures will rise - unless you reprogram your combustion controls. Even then, the exhaust temps will rise somewhat. I totally agree - I really would NOT delete the EGR unless I got a tuner that re-programmed the combustion controls. Even then (as Matt from Spartan has mentioned) it seems the better fuel economy is with the EGR on. The only reason I see in deleting the EGR is to compensate for the other problems that vloney mentioned.

Why would I choose to compensate for the mentioned problems? Only because I was either unable to solve the problems OR I could not afford the cost of solving the problems.

Therefore for me - I routed the ccv through a filter. This is the ONLY thing I know to do to keep oil out of the intake and combustion process. I am hoping that this was the only cause of oily residue in the EGR system.

I guess there is one other thing I do to help reduce soot. I use synthetic oil since it "chars" at a much higher temperature than dino oil (resists charring). It is also important to use high deteregent oils to remove soot into the oil (where it can be filtered out) instead of allowing the system to get carboned up as quickly.

 

Are you certain VT365s have coolant filters stock? International pretty much did away with coolant filters around 2001 when they went to the Extended Life Coolant. Even the 2004 and newer DT466s have no provison for a coolant filter.
International T444Es did have coolant filters stock, at least up to 2001 when the coolant filter was replaced with a block off plate.

 

Besides worn or broken rings is there any other reason for fuel to appear in my ccv blowby? Can this be tested for with a magnahelic guage?
I temporarily routed my ccv to outside the frame rail under the driver door. Returning from a 280 mile highway trip, LA to Bakersfield, I found fresh fuel dripping from the frame and tank. lots of it.
Truck is 2004 6.0 with 122K mileage. bought it used 8 weeks ago and trying to figure out the condition and the fuel mileage. running B50 biodiesel. the truck seems to run good however I'm a first time diesel owner.
Thanks for the huge education on these forums.