SubscribeCummins today launched the new QSB3.3 engine at the INTERMAT exhibition (April 24-29) with a power range extending from 60 to 82 kW (80 to 110 hp).
Meeting EU Stage IIIA and EPA Tier 3 emissions, the QSB3.3 is the first industrial engine of its size to incorporate full-authority electronic controls and a High Pressure Common Rail (HPCR) fuel system. At 82 kW (110 hp) the QSB3.3 offers equivalent performance to that of larger 4.0 to 4.5 litre engines - but with the installation advantage and economy of a 3.3 litre size engine.
"The QSB3.3 doesn't just contradict conventional thinking about compact power - it re-writes the rules", commented Chris Kete, Director of Cummins Light Construction Business. "This new engine moves beyond the capability of other 3.3 litre engines to offer the same 82 kW (110 hp) associated with the 4.0 to 4.5 litre engine class - but now with an engine package over 30% smaller and lighter".
"The QSB3.3 achieves this by combining our compact 3.3 litre platform with the performance enhancing technology of Quantum electronics and HPCR similar to that found on Cummins engines such as the QSB4.5 and QSB6.7. As a result, power is increased by around 30% and peak torque by 40% without impacting fuel consumption.
The top-rated 82 kW (110 hp) QSB3.3 meets Tier 3 emissions levels yet achieves the same fuel-efficiency as the lower rated 63 kW (85 hp) mechanical B3.3 at Tier 2. We expect the QSB3.3 to offer an ideal power solution for compact equipment varying from skid-steer loaders and rollers to site dumpers and back-hoe loaders", added Kete.
The QSB3.3 provides a seamless electronic integration with equipment using a CANbus J1939 public datalink. With Cummins PowerMatch installation software the engine can be electronically calibrated with a torque curve and feature set ideally suited to individual applications.
Electronic features such as auto-derate engine protection, idle shutdown and rapid diagnostics bring significant operational advantages. The ability to download engine duty cycle data is a useful feature for rental equipment operations.
Improved power delivery across the rpm range is a noticeable feature of the new QSB3.3. Cummins HPCR fuel system enables high pressure fuel injection from 800 to 1100 bar (11,600 to 16,000 psi) to be maintained independent of engine speed. Combined with precision electronic control of fuel metering and timing, this results in easier cold starting, improved idle stability and faster load acceptance.
"The QSB3.3 was specifically designed to offer the strength and durability of a 4.5 litre engine but within a smaller and lighter envelope", explained Scott Towsley, Chief Engineer of the QSB3.3. "In fact, with a peak torque of 412 Nm (304 lb-ft) available at 1400 rpm and faster electronic response the QSB3.3 will outperform some of these larger engines in terms of machine productivity".
"The engine has the advantage of evolving from the proven, reliable B3.3 platform already incorporating heavy duty features associated with larger Cummins engines. These include a cast iron, parent bore cylinder block with structural ribs, camshaft, crankshaft and rods all made of forged steel and a one-piece aluminium piston. The QSB3.3 is a rock solid and dependable design", added Towsley.
The QSB3.3 is set to establish new standards of engine sociability for compact equipment. Noise has been dramatically reduced to just 75 dBA at idle and only 88.9 dBA at full load for the 82 kW (110 hp) rated QSB3.3. The engine offers exceptionally clean operation with visible smoke reduced as low as 0.6 Bosch opacity at torque peak. Together with low vibration levels, these improvements add up to a more comfortable and productive operating environment.
The 82 kW (110 hp) rated QSB3.3 is ready to meet Stage IIIA / Tier 3 emission standards ahead of the 1/1/2007 effect date for this power output.
Four other power ratings are available, extending from 60 kW (80 hp), 63 kW (85 hp) and 71 kW (95 hp) to 74 kW (99 hp). These ratings will be initially certified to meet current Stage II / Tier 2 emissions regulations and then re-certified for Stage IIIA / Tier 3 well ahead of the 1/1/2008 effect date for the below 75kW (100 hp) power band.
The QSB3.3 meets lower emission standards without resorting to the complexity of Exhaust Gas Recirculation (EGR) found on many other competitive industrial engines. Cummins advanced in-cylinder combustion formula is a simpler, more robust and proven off-highway solution. It also means that the QSB3.3 can safely operate on fuel with a high sulphur content anywhere in the world.
Cummins Inc. is the world's largest independent manufacturer of diesel engines. With over 28,000 employees, Cummins reported sales of $9.9 billion in 2005 and produced over 750,000 engines. Headquartered in Columbus, Indiana, (USA) Cummins serves customers in more than 160 countries through its network of 550 company-owned and independent distributor facilities and more than 5,000 dealer locations. A substantial manufacturing presence in Europe includes the mid-range engine plant at Darlington UK and the high horsepower engine plant at Daventry, UK.
Paris, France (April 24, 2006)