CHARLESTON, S.C. (February 1, 2013) – The new QSB6.7 engine from Cummins Inc. has increased power, now offered at 550 hp for the recreational marine market.

While meeting EPA Tier 3 emissions regulations the new QSB6.7 offers better performance, improved sociability, and improved operations over Cummins’ beloved QSB5.9 model, all without sacrificing fuel economy.

The EPA Tier 3 emission standards are approximately a 20% reduction in NOx and a 50% reduction in particulate matter (PM) compared to Tier 2 standards. The standards will be phased in beginning January 1, 2013 through 2014. Standards and implementation dates are based on the engine’s displacement in liters per cylinder.

Cummins engineers reached Tier 3 emission levels by improving the efficiency of the in-cylinder combustion events. A new fuel calibration strategy allows for less wasted fuel, creating less particulate matter and resulting in cleaner exhaust. While reducing emission levels often means a sacrifice in performance. Cummins is proud to have avoided that sacrifice. The Cummins QSB6.7 also provides more torque, which means better acceleration and maintained speed through turns. A pair of QSB5.9 480 hp engines linked to Zeus® pods installed in a 44-foot express cruiser test boat accelerated the boat to 20 mph in 14 seconds, while the same boat powered by QSB6.7 480 hp engines accelerated to 20 mph in just 8 seconds, with little change to the legendary QSB fuel economy. The QSB6.7 also employs a new fuel calibration strategy: Unlike most marine engines, the QSB6.7 is calibrated for optimal fuel economy at cruising speeds, where the engine is most often used, rather than at wide-open throttle.

The QSB6.7 is sociably improved, offering exceptionally low cold-start smoke levels, and significant sound reduction at cruise and rated speeds compared to the QSB5.9. Operationally the QSB6.7 has improved as the standard fuel system is compatible with low lubricity fuels. Also, the air-filter temperature sensor provides peace of mind when the engine is used in extreme temperatures.

The Cummins QSB6.7 is available from 230 to 550 mhp. This includes high output, intermittent duty, government service and commercial ratings available for inboard and Zeus® pod-drive applications.

The QSB6.7 marine engine will be on display during the 2013 Miami International Boat Show in the convention center at Cummins booth #M85. Cummins will also be offering sea trials on QSB6.7-powered boats during the show: SeaIsle Marina, 1635 Bayshore Drive Miami FL, 33132. To schedule a sea trial contact Andy Kelly, Cummins Marketing Communications Manager, at 850-258-3249 during show days and 843-745-1172 prior to the show. You can also visit Cummins at the Yacht and Brokerage Show on Collins Ave.

High resolution photography of this product can be obtained by contacting Andy Kelly at

About Cummins Inc.
Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins employs approximately 44,000 people worldwide and serves customers in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributor locations. Cummins earned $1.85 billion on sales of $18.0 billion in 2011. Press releases can be found on the Web at or Follow Cummins on Twitter at and on YouTube at