Gentlemen:
This may not be the right forum but it is an engine related question that applies to Powerstroke, Duramax, and Cummins.

Knowing that the Powerstroke is having problems with emission controls (stuck EGR valves, etc.) how do the Duramax and Cummins deal with the subject of meeting emission requirements and are they having any better luck at it?

Please understand that is not an attempt to get a riot started; note that I am the owner of a Powerstroke.

I am trying to understand technical differences in how the manufacturers approach the problem.:exactly:

as far as I know there haven't been that many issues with the GM emissions equipment..other than the fact that we don't like having it. They are meeting 2007 requirements with the 04's already. I have heard a few that needed EGR replacements, but other than that nothing really stands out. the systems all sort of work the same way. It may just be who they are buying the parts from, or who is making the parts.. get what you pay for kind of thing...who knows..

fwiw, I'm not an engineer/mechanic, so i cant explain how, but i'm pretty sure dodges dont have egr valves....

Cummins has very little emissions control. No EGR.

Cummings reduces emissions by 1/4....

By running two less pistons!

I wouldn't be too sure that Dodge is not using EGR. There are two kinds, active and passive. Active style is what the Duramax has. It is an electromechanical system to drive some exhaust gases back into the cylinders. Passive is like the Corvette engine, where they use valve event timing to keep some spent gases in the chamber when the exh valve closes. My guess is Dodge is passive EGR.

cummins has a third injection event in leau of an egr.

everyone uses pilot injection, multi port injectors, and cats

Dodge uses a system called HPCR ( high RPessure Common Rail ), is has something to do with using up the unburned fuel in the cylinder. They dont have EGR valves, though they might in the future.

I could be wrong, Iread this somewhere, Dieselram I think.

dodge and chevy use both. Higher pressure fuel squirted in burns more completely. A high pressure pump sends fuel through a common fuel rail to each injector, the injector opens when told to and lets the fuel squirt in. HPCR is a very good thing. its one reason we can get huge power increases with just a chip.

Cummins does not have an EGR. They have a third injection pulse that cools down the gases to reduce the formation of Nox and PM.

Cummins has NO EGR.... believe it. It doesn't overheat. It's designed to pull giant loads hard all day in the brite hot summer sun.

Cummins has NO EGR.... believe it. It doesn't overheat. It's designed to pull giant loads hard all day in the brite hot summer sun.:stirthepo:lol::muahaha:

Cummins has NO EGR.... believe it. It doesn't overheat. It's designed to pull giant loads hard all day in the brite hot summer sun.

You SURE it doesn't have cam overlap timing to induce EGR? It's called passive EGR.

no egr!! the cummins diesel only needs ci-4 rated oil. the other diesel engines that have an egr need to use ci-4 "plus" rated oil, due to the added soot control- because of egr's!

http://www.everytime.cummins.com/every/applications/ram_reliability.jsp

Cummins has NO EGR.... believe it. It doesn't overheat. It's designed to pull giant loads hard all day in the brite hot summer sun.

Now if they could just produce a reliable tranny and truck to wrap around that Cummins. A nice package it would be. :exactly:

They've had less trouble with the 48RE than GM has with the Allison. The rest of the truck is fine too they're just built to work not get groceries!):h So they might not be as comfortable.

They've had less trouble with the 48RE than GM has with the Allison. The rest of the truck is fine too they're just built to work not get groceries!):h So they might not be as comfortable.

I have to call BS on that one. Being an ex Dodge owner and a member of a family who drove Dodges to haul cattle for years I can say first hand that their truck and transmissions are not even close. We have been through several transmissions so you cant say it's luck of the draw and not fact. If you plan on working a Dodge hard (towing + 15000#) you would be better off with a standard transmission. Other than that they will last. There is no comparison to the Allison or Torqueshift when towing huge loads.

Barry Smith, what problems has their been with the allison, I'm assuming that was a joke, considering the great success that dodge has had with their automatic trans. The only time you will have trouble with an allison is when you start adding power to the tune of about 125hp or so. And I'm sorry but there is reason dodge trucks even with the cummins are 2000-3000 less than a ferd or a chevy and it is not because the quality is better.

what problems have there been with the dodge tranny 48re? i have yet to hear anything on that one

Getting back on topic...

DOES the cummins have passive egr as Pat questioned? I'm 99% sure it didn't through '02. Seems they would have to be doing something. If not, then I'm even more impressed...

Ty

"In-cylinder combustion and diesel oxidation catalyst solution requires no exhaust gas circulation components"......... per cummins website


http://www.everytime.cummins.com/eve...eliability.jsp (http://www.everytime.cummins.com/every/applications/ram_reliability.jsp)

cummins has a third injection event in leau of an egr.

Not the 2004 305/555. They added the third event to the 600 Series in 2004.5

My truck came with no CAT, no EGR and no third injection for emissions. And no they do not overlap valve timing to create egr.

My trans, engine and truck over all does not have electronic bugs, codes, or limps. You beat it and it goes. Well I do get a check engine light every once in a while from the box. Doesn't effect anything and goes away.

Now if they could just produce a reliable tranny and truck to wrap around that Cummins. A nice package it would be. :exactly:

They do have a reliable tranny..... HELLO this isn't your fathers Dodge :lol:

thanks...

Ty

Yes the new 4 speed is supposed to be a lot better than the old autos, however still a few gears short. Which I dont understand seems to me that dodge would want more gears to keep the cummins down low where it makes all of its torque. Sorry guys, all done, back to the mission at hand.