Changes to Ram HDs Cummins Diesel?

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Rumors are circulating that the next generation Cummins turbo-diesel will move toward a less-expensive, industry-standard technology. This change will remove a competitive edge that certain Ram HD pickups enjoy.

Changes to Cummins Diesel?

Rumors are swirling about the next generation Cummins diesel and how it will impact Ram HD pickup sales.

The rumor specifically deals with Cummins moving away from “its relatively expensive precious-metal catalyst strategy in favor of the proven  urea-injection technology. (Ram HDs don’t need to use urea-injection fluid tanks, whereas Ford’s Power Stroke and GM’s Duramax engines use urea injection)”, according to

Also pushing the move is higher EPA regulations which makes the HDs catalytic converters more pricey.

Why This Rumor is Important
For years, Ram has been advertising the fact that their Cummins diesel engines did not require owners to pay for regular diesel exhaust fluid (DEF) fill-ups. This has been advertised as a competitive advantage over the diesel engines offered by Ford and GM because it means

  1. Less maintenance hassle for Ram owners
  2. Lower operating costs
  3. Better performance, because the Cummins system is less restrictive than the DEF systems used by Ford and GM

If Ram abandon’s their current system and goes with an exhaust system using DEF, they’re going back on their own advertising.

What’s even more interesting is that Cummins – which pioneered the catalyst system currently used in the Ram HD diesel truck – has made noise in the past about the legality of diesel exhaust fluid (DEF) systems. Some people at Cummins have said that any diesel engine which depends upon DEF to meet the emissions requirements isn’t technically following the letter of the law. Their reasoning is that a DEF truck can only stay legal if the owner refills their DEF tank on a regular basis. If a Ford or GM truck owner were to stop filling his or her DEF tank, the engine is no longer complying with the EPA rules.

This rumor seems to indicate that Cummins isn’t interested in “fighting the good fight” any longer, and perhaps that diesel truck buyers don’t particularly care about filling the cost or inconvenience of filling their DEF tanks.

About Diesel Engine Emissions Laws
Federal emissions regulations require diesel engine exhaust to be almost as clean as gasoline exhaust, with strict controls on the amount of Sulfur and Nitrous oxides and particulate matter that can be expelled. The auto industry has implemented a number of different systems to try and meet the regulatory requirements:

  1. In 2007, almost all filling stations were required to start selling ultra low sulfur diesel fuel to the general public. By taking the sulfur out of the fuel at the refineries, the amount of sulfur oxides in the exhaust were dramatically reduced.
  2. As of 2010, all diesel vehicles sold in the US need to use either a) an expensive and complicated catalyst system known as “Selective Catalytic Reduction” (SCR) or b) a diesel exhaust fluid (DEF) system to mitigate nitrous oxides and other pollutants
  3. Since 2007, all diesels sold in the US use a filter to capture particulate matter (known as a DPF). This filter must be “regenerated” on a regular basis, which basically means the vehicle injects fuel into the exhaust stream (either in the cylinder or just ahead of the DPF) in order to super-heat the exhaust gases and “cook” most of the particulate matter out of the system.

If this all sounds complicated and expensive, it’s because it is. The worst part? These regulations are becoming even more onerous in the near future. While clean air is obviously important, the specific rules developed by the EPA are in some ways unfair. What good are diesel emissions regulations if they make purchasing a diesel engine prohibitively expensive? After all, diesels are inherently more efficient than gas engines…that’s why they’re so popular in just about every country on the planet except the USA.

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  1. mk says:

    Agree, if a diesel engine upgrade in any vehicle was under 2 grand to get, more would consider a diesel engine. Right now, besides some VW small cars achieving some awesome mpg numbers, the U.S. market only buys diesels in pickups if they need the pulling power.

  2. tyler says:

    That’s true MK. If going to diesel was more cost effective more people would be switching.

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