Darlington, UK (June 8, 2009) -

Cummins class leading ISBe 6-cylinder engine now comes with additional power of up to 300ps for use in city bus applications.  Available with 1100Nm of torque it meets Euro 5 and EEV emissions levels without the need for additional particulate filtration.

The 6.7 litre ISBe was launched in 2005 in preparation for Euro 4 emissions.  It built on the success of the previous 5.9 litre design, which had already established itself as an accomplished engine for city bus use.  The increased displacement allowed improved performance with higher power and torque.   Using SCR aftertreatment as part of Cummins integrated system drove operational cost benefits of improved fuel economy and extended service intervals.  

Since its introduction, the 6.7 litre ISBe has had significant success with bus manufacturers and operators across Europe and has established itself as the engine of choice for inner-city double deck bus applications.  Euro 5 and EEV have also been achieved with all of the power and fuel economy benefits seen at Euro 4.

City buses are recognised as having extremely tough duty cycles due to the stop-start nature of operation.  At Euro 4 the ISBe’s top rating for city buses was 250ps with 1020Nm of torque.  Based on over one million hours of successful operation Cummins Engineers have developed a new rating, moving it up to 300ps with 1100Nm of torque.

Neil Pattison, Cummins Automotive Business Leader for Europe said, “The ISBe has proved to be very robust and dependable in city bus operation.  This experience has enabled us to extend the envelope of the engine without any impact on reliability or durability.  The new 300ps rating means that the ISBe is suitable for buses with a higher passenger capacity or for more demanding routes.”

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 serves customers in approximately 190 countries and territories through a network of more than 500 company-owned and independent distributor locations and approximately 5,200 dealer locations. Cummins reported net income of $755 million on sales of $14.3 billion in 2008. Press releases can be found on the Web at everytime.cummins.com.
EEV stands for “Enhanced Environmentally-friendly Vehicle”, and is a voluntary standard that is more stringent than the lowest levels introduced by the European Community to date, Euro 5.   Versus Euro 5, EEV requires particulate matter to be reduced a further 33% (from 0.03 g/kW/hr to 0.02g/kW/hr) on the European Transient Cycle.  Hydro-carbons, carbon monoxide and oxides of nitrogen (NOx) remain as low as Euro 5.