2.8L Cummins 1/2 Ton Diesel
28 MPG Cummins Powered Nissan Titan
The United States Department of Energy (DOE) and Cummins have released plans for a new 2.8L 1/2 ton diesel engine. Cummins has partnered with Nissan Motors, NextGen Emissions Solutions, & Johnson-Matthey Inc. to design and produce a diesel powered Nissan Titan. Development of the 1/2 ton diesel Titan is currently underway (began 10/1/2010) and production of the first prototype was completed April 2011. The projected completion date is September 2014. The first prototype yielded 15.6 mpg city & 24.5 mpg highway mileage. The prototype, weighing in at 5,500 lbs, was based on a 2010 2wd Nissan Titan.
Cummins/Nissan's current goal is a low emission, light duty truck capable of achieving 28 miles per gallon. The DOE is currently projected to invest 15 million dollars in the project, 50% of the total estimated cost. In terms of engine design, Cummins has prioritized their goals as follows: 1). Engine reliability 2). Initial price/making the diesel engine option affordable 3). Maximizing fuel economy 4). Horsepower output 5). Torque output.
Furthermore, Cummins hopes to produce an engine that does not exceed the weight of the current gasoline engine used in the Nissan Titan. DOE fuel economy targets are currently 21.8 mpg city and 34.3 mpg highway mileage.
Approaches & Methodology
Cummins is taking some innovative steps in the architecture of their new engine. In designing the engine, Cummins has made it clear that Power Density & reduction of parasitic losses is key. Here's a few features that Cummins hopes will help the engine meet their goals:
• Select engine displacement to maximize power density.
• Reduce engine weight, with the goal being for the diesel to way the same as the current gasoline options.
• Utilize a low pressure exhaust gas recirculation (EGR) system to reduce engine pumping losses.
• Use manufactured exhaust manifolds instead of cast iron for weight reduction, faster engine warm up cycles, and increased efficiency of emissions components (DOC/DPF).
• Reduce parasitic losses by using a light weight, low friction rotating assembly.
• Locate the diesel particulate filter (DPF) and diesel oxidation catalyst (DOC) on the engine for increased efficiency (more heat will be available to these components and therefore require less fuel to maintain required operational temperatures).
More about the Engine:
Very little information has been released on the technical specs of the engine. Here's what is known about the current design (these specs may change at any time):
• Current design is a 2.8L (170.8 cubic inch) 4 cylinder diesel, direct injection.
• Piezo injectors.
• 350 lb-ft
• High efficiency emissions components.
The next prototype is scheduled to be completed September 2011. Hopefully we will learn more about this intriguing design in the near future. Could this possibly spark other automakers to relaunch their 1/2 diesel programs? We sure hope so!