Cummins New EPA Tier 3 Engine Gets Severe Pre-Market Workout

By George Backwell at January 12, 2013 20:40
Filed Under: Marine Diesel Engines, Workboats

Cummins Marine took their time so as to make doubly sure before releasing their new EPA Tier 3 compliant engine to the market; just in time to breast the tape before the deadline for the EPA standard for 2.5 to 3.5-liter per cylinder engines took effect on New Year’s Day. That was because they needed time to give their new QSK50 EPA Tier 3 engine a thorough work-out in a real marine working environment (and a tough one at that, as we shall see) on top of earlier test-bed trials in the factory.

What better than to install the new engine in a working towboat – which is just what they did last August –  so that by mid-December 2012 the engine under test had done its job for about 1720 hours, in one of Enterprise Marine’s towboats, the  Eugenie, under the sharp eye of Cummins’ engineers.

Towboat 'Eugenie': Photo courtesy of photographer Ron Richardson/Dick's Towboat Gallery

The Eugenie’s  natural habitat as a push boat working the US inland waterway system demands of an engine frequent increase and decrease in power. One moment, while working around a down river bend, the engines may be idling, while a few minutes later full power may be needed to push a heavy tow on down the river. Backing power becomes important when working a tow off a fleeting area; these kinds of fluctuating power demands and frequent shifting put the new engine to a severe test.

Cummins Marine chose the 105 by 32-foot towboat Eugenie, already powered by a pair of Cummins 1600 HP QSK50 Tier 2 engines, for an easy installation of the new Tier 3 compliant QSK50, with only two minor modifications: change of the propellors to a larger size to take full advantage of the engine’s increased power, and in the engine room the exhaust turbo-charger exhaust was moved just 621 mm to mate up.

Cummins Application Engineer John Echavarria says of the engines’ performance: ‘During this time no significant issues were reported. All coolant, fuel, lube, electric and mounting connections for the QSK50 Tier 3 are the same as they were for the Tier 2 engines.’

Cummins QSK50 EPA Tier 3 engine: Image credit Cummins Marine

Features of the New Engine

  • Output: The 50-liter 16-cylinder engine produces 1800 HP at 1800 RPM.  
  • Engine Design: Reliable base engine uses common components from the proven K19, K38 and K50 engines. A new cast-iron, ductile single-piece piston with nitride-coated rings and hardened cylinder liner provides excellent durability and long life
  • Fuel System: Modular Common Rail Fuel System features a simplified design which provides constant high injection pressure regardless of engine speed or load condition. Benefits include low noise and vibration for quiet operation, idle stability and improved low-end torque
  • Cooling System: Two-pump, two-loop, low temperature after-cooling maximizes efficiency and improves performance. Engine-mounted titanium plate heat exchanger provides superior durability with minimal maintenance requirements
  • Exhaust System: Dry-shielded exhaust manifold and turbocharger. Vertical or horizontal exhaust connections available for installation flexibility
  • Air System: Turbocharger optimized for vessel operating conditions and safety. Mounted or remote marine grade air cleaner with replaceable canister reduces maintenance cost
  • Lubrication System: Standard capacity 151 L (40 gal) and high capacity 204 L (54 gal) marine grade oil pan.




Comments are closed

Tag cloud