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Oct 1, 2003 12:00 PM

Cummins Inc's new ISC and ISL engines now will deliver increased performance and enhanced reliability to the medium-duty and vocational truck markets.

These engines feature a new High-Pressure Common-Rail (HPCR) fuel system resulting in increased performance, lower emissions, and noise reduction of more than 30%. HPCR also gives the engines multi-injection capability and improved cold starting. The common-rail design maintains high injection pressures regardless of engine rpm, for superior performance across the entire power range.

Both engines have undergone more than three million miles of field-testing. The ISL offers the patented Cummins Variable Geometry Turbocharger (VG Turbo) by Holset that constantly adjusts airflow based on factors including engine load, altitude, and temperature. The ISC uses a wastegated turbocharger, also produced by Holset.

Like the ISL, the ISC now includes roller followers. Both engines have mid-stop cylinder liners. The ISC and ISL also offer targeted piston cooling for increased engine life. Coolant flow has been optimized and balanced, reducing cylinder temperatures. The ISC and ISL use the same Electronic Control Module and software as all Cummins engines.

Both engines are covered by Cummins' “Same Day Or We Pay” QuickServe Guarantee. With this guarantee, qualifying in-shop repair jobs, with a standard repair time of four hours or less, will be completed that same day — or Cummins will offer a $75 credit toward future Cummins parts and service.