EGR on Cummins 600?

[tschwab]

Do the new '04. 5 and upcoming '05's (325hp/600tq) have the dreaded EGR Valve? I was thumbing through some older TDR magazines from when the 3G trucks first came out. Back then, it was thought that the '04 and newer trucks "might" have EGR.



I don't believe this happened in '04 when the new 600 came out, but I want to confirm this. I apologize if this has been covered before, which I'm sure it has. I have tried search with no success. It has probably been covered in the TDR magazine, which unfortunately I have not had a chance to completley go through all of the 3G articles.

 

[Yo Hoot]

No EGR. That was misinformation. The TDR guys talked about that in the latest issue.



The "600" uses what's called "In Cylinder" emissions control. All done by combustion and injection optimization + CAT

 

[JohnnyH]

I have a stupid question. I dont know anything about an EGR but from what I read, people hate it. What is it about EGR that make so many people cringe. Just wondering.



John

 

[tschwab]

See page 28 in TDR issue #38 for starters. There has bee alot written about EGR over the years, the way I understand it in simple terms, it forces oily exhaust back through your engine which can cause plugging and corrosion.

 

[JohnnyH]

Unfortunatly I dont have issues that far back. I'm a bit of a newbie on this forum. I will however try some searches on it, because I'm curious.

 

[SSchang]

EGR is Exhaust Gas Recirculation. An EGR valve is mounted to the exhaust manifold, and is electronically, hydraulically, or air controlled to open at certain times while the engine is running. The exhaust gas travels through an EGR cooler (coolant / exhaust gas heat exchanger) to drop the exhaust gas to ~350 F. A venturi then meters the cooled exhaust gas into the intake air stream just before the cylinder head, after the turbo.



The cooled exhaust gas cools the combustion temperature, reducing NOX (Oxides of Nitrogen) that is a key component of internal combustion emissions. Cummins has been using the EGR technology on Heavy Duty engines successfully since 2002.

 

[JohnnyH]

Thank you for the explanation. I can see that if it is not designed properly, it can be a trouble system.

 

[nickleinonen]

all egr systems that use an external valve are poorly designed systems. in todays modern age, the egr system should be controled by variable valve/camshaft timing [you need twin cams for it] , or a "camless" setup with electro-hydraulic actuators. all you need to do to achieve the egr effect is to close off the exhaust valve a little earlier and it works. lots of import gas jobs use them, as well as some newer domestics... i haven't seen vvt on a diesel yet, and i doubt we ever will. camless diesel engines will become a reality [if you get the north american diesel progress news letter, last issue there was a article on the camless stuff] the new actuators that have been developed are good to ±4000rpm engine speed... .