Used Diesel Motorhome

Cummins, Feds Developing Four-Cylinder Diesel for Nissan Titan

Cummins is developing a high-efficiency inline-four-cylinder diesel engine with money from the U.S. Department of Energy and in partnership with Nissan for demonstration in the Titan light-duty pickup truck. The project was announced at the DOE’s 2011 Merit Review in Washington, D.C..

Most half-ton truck makers are betting on small-displacement direct-injection gasoline engines to meet future fuel economy regulations, but Cummins expects its small displacement oil burner to get 40 percent better fuel economy over current light-duty V-8 truck engines. The Cummins average fuel economy target for this new diesel engine is 28 mpg while meeting tough U.S. Tier 2 Bin 2 emissions limits, according to the presentation.

Getting 28 mpg combined mileage could mean more than 30 mpg highway, by our estimate, which could help Nissan meet strong new EPA regulations that will raise fleet fuel efficiency standards for light trucks and SUVs to 30 mpg by 2016. The standard for passenger cars is set at 39 mpg by 2016.

Though the project started in September, Nissan and Cummins have already built a prototype version of the four-cylinder diesel and installed it in a current-generation Titan mule for drive testing. Pictures of the engine show four high-pressure fuel rails feeding the engine’s cylinders.

Four cylinders might not seem like enough to power a full-size pickup but that architecture would be ideal to meet fuel economy goals while delivering almost as much torque as some small displacement gasoline V-8s.

The engine has a 2.8-liter displacement (170 cubic inches). Initial power figures on the engine dyno have the mule test engine producing 350 pounds-feet of torque at around 1,800 rpm. A chart in the presentation shows targeted power levels to be approximately 220 horsepower and 380 pounds-feet.

The engine is a derivative of the four-cylinder ISF architecture that Cummins builds overseas, with 2.8-liter and 3.8-liter displacements, according to a Cummins spokesman. The overseas 3.8-liter is rated at 168 horsepower and 443 pounds-feet of torque.

Innovations highlighted by Cummins in their presentation include the use of high-strength steel pistons instead of conventional aluminum pistons. Steel pistons can handle high power loads with a shorter stroke, which also helps reduce the overall height of the engine for improved underhood packaging. Cummins is also studying the use of variable valve technology, according to the presentation.

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Motor Home Specialist Used Sportscoach RV for Sale - 1999 Sportscoach diesel pusher with slide, model 381KS: Only 81,445 miles! This RV is approximately 38' in length and features a powerful Cummins diesel engine, Freightliner chassis, Allison 6-speed automatic trans, 7.5KW Onan diesel generator, automatic leveling system, DVD/VCR and (2) TVs. For complete details visit Motor Home Specialist at MHSRV .com or 800-335-6054. Some additional features include: back-up camera monitoring system, patio awning, water heater, 50 amp service, power steps, wheel simulators, docking lights, exterior shower, gravel shield, dual ducted roof A/Cs, exhaust brake, air brakes, cruise control, tilt/telescoping wheel, cab fans, power mirrors with heat, CD player, dual pane windows, convection/microwave, 3-burner range, solid surface counters, refrigerator, queen bed and much more. DISCLAIMER: *(w.a.c.) Estimated payment figured at 6.99% on 20 years with 10% down. Price and payment does NOT include TT&L or any other fees that may apply. All sale prices include any and all other incentives, offers and rebates offered by Motor Home Specialist or any other manufacturer unless specified in writing. Manufacturers standards & features are subject to change without notice. Online information deemed reliable, but not guaranteed. Due to high volume sales some Videos, virtual tours and pictures may not represent actual vehicle for sale. MHSRV Prices and special offers are subject to change without notice. All weights & measurments are approximate and NOT guaranteed to be 100% accurate. Verify before purchase.