The 2007 Cummins ISL, rated up to 365 hp

Cummins says that its 2007 ISL engine will deliver increased performance and fuel efficiency for vocational customers. The 8.9-liter diesel is said to offer the highest power-to-weight ratio in its class, in ratings up to 365 hp and torque of 1250 lb ft. The company adds that low life-cycle costs (including maintenance intervals) will be maintained. A new option allows mixer operators to monitor the engine oil level from inside the cab, eliminating the need for daily manual inspection.

The ’07 ISL will also feature an enhanced high-pressure common-rail (HPCR) fuel system that delivers higher injection pressures for lower emissions. It will continue
to feature the same patented, variable-geometry turbocharger (VGT) used in current engines. It constantly adjusts air flow to reduce turbo lag, improve transient response, and increase vehicle performance.

The ISL engine will also employ cooled exhaust gas recirculation (EGR) technology and an integrated ‘Enviroguard’ particulate filter to meet the U.S. Environmental Protection Agency (EPA) emissions standards for 2007. The combination of cooled-EGR and exhaust aftertreatment will be consistent across
all Cummins 2007 on-highway diesel engines for North America.

The particulate filter is designed to last the life of the engine, the company says. It automatically collects and oxidizes particulates. When there isn’t sufficient heat
in the exhaust, the engine control module (ECM) actively controls exhaust-gas temperatures so the catalytic reaction can take place. The particulate filter will require periodic service to remove the ash content. A typical vocational truck will need this filter serviced only once every 6000 hours.

By EPA decree the ISL engine, like all other makes, will also feature a simple crankcase ventilation-management system that virtually eliminates any oil carryover from the engine. The average vocational truck will need to replace the low-cost Enviroguard coalescing filter at every third oil change.