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Cummins engine designations

by Leo Everitt

ISX Dual overhead cams, an integrated engine brake, and up to 565 horsepower.

ISM Designed for long-distance cruising up and down the interstate. With the highest power-to-weight ratio in its class, the ISM 450 and 500 horsepower ratings let you climb every mountain.

ISL Our newest and fastest-growing engine in the motorhome market. Flatten those hills with ratings from 350 to 400 horsepower.

ISC With 330 horsepower, the ISC will get you where you need to go in a hurry. Plus, it's 50% quieter than previous models.

ISB An electronic fuel system and a Variable Geometry Turbocharger make the 300-hp ISB up to 80% quieter than its predecessor. It also runs cleaner and faster with better fuel economy and your choice of 600 or 660 lb-ft of torque.

Every Cummins electronic diesel engine is backed with a 5-year/100,000-mile (160,935 km) warranty, which is supported by the most extensive customer support in North America.