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Meet The Largest Cummins Ever Built: The 4,000HP QSK95

March 2012 Torque

Text By , Photography by Courtesy of Cummins

Just when we thought we’d seen it all (“78.0L Colossal Cummins Engine” June ’10), Cummins created an even larger engine to help conquer the globe. The all-new, V-16 QSK95 engine, built in Seymour, Indiana, was designed for long-hour, extreme-load applications in passenger and freight locomotives, various marine vessels, and ultra-class mine trucks. In addition, it will be used in power generation applications as well as in the offshore oil drilling industry (at varying power levels).

1 Quad-turbocharger, single-stage, forced induction system
2 Modular common-rail system (MCRS) provides injection pressures in excess of 31,000 psi
3 One-piece, forged-steel pistons for utmost durability
4 Hardened cylinder bores with mid-stop cylinder liners
5 Deep-skirt, ductile-iron block utilizes internal bedplate for increased rigidity
6 Four Cummins ECMs control each engine quadrant and sit (protected) at the front of the engine for easy accessibility and diagnostic interfacing

At 95 liters, the QSK95 displaces more than 5,700 cubic inches—and makes 4,055 hp (or 2,983 kW) at 1,200 rpm. For a solid foundation, the QSK95’s ductile-iron, deep-skirt block incorporates an internal bedplate for great rigidity and to help minimize engine vibration. Durable, single-piece, forged-steel pistons are utilized and can be reused at overhaul. The hardened cylinder bores feature mid-stop cylinder liners and dual-piston cooling nozzles per cylinder for reduced piston temperatures and increased wear resistance.

According to Cummins, this engine can consume more than 1.7 million gallons of fuel before an overhaul is required. The QSK95 also meets Tier 4 Final Rule emissions standards for off-highway equipment and does so without the use of exhaust gas recirculation (only selective catalytic reduction aftertreatment is used). Last but not least, Cummins will also soon begin producing a 20-cylinder, 120.0L version (QSK120) capable of more than 5,000 hp.

Fuel and Air
The latest generation modular common-rail system (MCRS) keeps the combustion event extremely efficient. In fact, in-cylinder injection pressures can exceed 31,000 psi (2,200 bar). Cummins’ new NanoNet fuel filtration system offers superior fuel cleanliness, which allows engines to operate anywhere in the world (with varying fuel quality). Up top, four compact turbochargers respond exceptionally well to load (providing outstanding step-load resistance) and transient response, despite their single-stage arrangement.

Box 3005
IN  47202
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