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  • New Cummins 2.8L Four-Cylinder Diesel Engine

New Cummins 2.8L Four-Cylinder Diesel Engine

Inside The Next-Generation ½-Ton Diesel Engine

Jason Thompson
Sep 1, 2011
Photographers: Courtesy of the Department Of Energy, Courtesy of Cummins
You’ve heard the rumblings of a ½-ton diesel pickup coming to the United States since we wrote “New Cummins V-6 and V-8 Diesel Engines” (Dec. ’06). Our optimism has peaked and been dashed during the last five years as all of the ½-ton pickup manufacturers hinted at—and in some cases announced—and then cancelled their plans to offer a compression-ignition engine in a ½-ton truck. So far, we’ve been promised much (including a mini-truck diesel from Mahindra), but as of today, nothing’s been delivered. The good news is as fuel prices continue to climb, so does the consumer thirst for diesels. Once one manufacturer puts a hole in this dike of demand, we’ll see a flood of efficient diesel pickups finally refresh the United States market. Barring another economic collapse, our crying wolf about ½-ton diesels is about to be a thing of the past.
Photo 2/9   |   This Cummins 2.8L four-cylinder uses premixed charge compression ignition (PCCI) combustion and high charge flow (boost), which we described in our "The Future of the Cummins 6.7L" article (Feb. '10). Generation 3 piezo injectors and a common-rail fuel system (possibly from a supplier other than Bosch) help make this possible. Variable-valve actuation (VVA) is currently in the single-cylinder testing phase and is projected to be adapted to this engine.
DOE, Cummins, and Nissan
Recently released Department of Energy (DOE) documents describe developing a 2.8L four-cylinder Cummins diesel for ½-ton trucks using a Nissan Titan. There’s been no announcement from Nissan to offer this engine yet, but the DOE and Cummins-run test is scheduled to be completed by 2014. The fruits of this project are estimated to produce 220 hp and 380 lb-ft of torque, while meeting Tier 2 Bin 2 emissions standards and achieving 28 mpg. The budget is $30 million, with the DOE chipping in half the cash. According to Cummins, “a fuel efficiency increase in light trucks and SUVs of 40 percent would reduce United States oil consumption by 1.5 million barrels per day.”
Photo 3/9   |   Design features for this downsized diesel include: lightweight steel pistons, reduced cylinder block weight, and a lower deck height. An Aluminum cylinder head (with variable swirl system) and forged crankshaft also help create more power density. This engine will use light-viscosity oil (possibly 0W-20) to further help fuel economy.

Sources

Cummins
Columbus, IN 47202
1-800-343-7357
http://www.cummins.com
Department of Energy
http://www.www1.eere.energy.gov
Johnson Matthey
+44 20 7269 8400
http://www.matthey.com
NxtGen
(604) 688-7841
http://www.nxtgen.com

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