Cummins Inc. announced its school bus engine lineup at the NAPT Summit Trade Show in Memphis, Tenn., to meet 2014 EPA greenhouse gas (GHG) emissions and NHTSA fuel-efficiency standards.
Joining the ISB6.7L is the ISL9, both clean diesel engines. While compliance with the standards are still more than a year away, Cummins stated that its engines will meet the requirements by Jan. 1. There are basically two ways manufacturers must meet these, by boosting fuel pressure and reducing "parasitic loads," such as the alternator, power steering pump and even the water pump) from the engine.
Cummins said that its engines will consume less fuel, which will help comply with the fuel-consumption part of the rule, of which low rolling-resistant tires will play a vital role, and simultaneously reduces CO2, the main GHG targeted by the EPA. The 200- to 300-horsepower ISB6.7L and ISL9 utilize Cummins' High Pressure Common Rail fuel system, the VGT Turbocharger and are fully integrated with electronic controls. Meanwhile, the 260- to 370-horsepower ISL9 features the XPI fuel system. Both engines utilize the Aftertreatment System from Cummins Emissions Solutions, which combines a Diesel Particular Filter (DPF) with Select Catalyst Reduction (SCR).
The ISB6.7L and the ISL9 will also include Onboard Diagnostics (OBD) to monitor emissions-related engine systems and components. OBD also alerts the driver of any malfunctions and faults.
"Cummins continues to show customers our commitment to being better where it counts for their business. We are delivering products with better fuel economy, reliability and durability that in turn will meet the 2014 GHG and fuel-efficiency standards a year early," said Tom Hodek, general manager of Cummins' North American Bus Business. "This pioneering capability as a leader in diesel engine technology emphasizes our long-standing commitment to bring cleaner and more fuel efficient products to the market for our customers."
In related news, the 2013 Cummins Westport ISL G natural gas engines will again be offered to the school bus industry. The ISL G shares 80 percent common parts with teh ISL9 and delivers low-end torque, transient response and quiet operation, the company added. The natural gas engine also features a passive Three-Way Catalyst aftertreatment system, which Cummins said is maintenance-free and packaged as part of the muffler.
All 2013 engines come with a 10-year extended coverage warranty option.