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Hi-tech Cummins hits 600hp

17th July 1997, Page 16
17th July 1997
Page 16
Page 16, 17th July 1997 — Hi-tech Cummins hits 600hp
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by Steve Sturgess • Cummins has launched its long-awaited 600hp engine, code-named Apex, as the Signature 600. As predicted, it is rated at 600hp (447kW) with 2,0501bft (2,779Nm) of torque and boasts a revolutionary fuel system with a new generation of electronics.

The all-new design takes over as Cunurnins' flagship range from the N14, which will still be available at 525hp (391kW). It will fit into chassis currently accommodating 460hp or 525hp without any additional cooling and will be developed to offer much more horsepower and torque.

It goes into direct competition with the 600hp Caterpillar 3406E which is bored and stroked to 15.8 litres to achieve its power and torque rating of 2,0501bft but has the same dimensions as the existing E-model big-bore Cats.

The Signature 600, however, is shorter, lower, narrower and lighter than the N14 or 3406E, weighing 13514 less than the N14.

The six-cylinder, 15-litre diesel has a bore and stroke of 137x169mm which, despite the increased displacement, allows for closer spacing of the bore centres to reduce overall length. This gives a shorter, stiffer crankshaft and reduces weight without sacrificing durability or reliability, says Cummins.

Fuel is delivered via a common rail system. A single high-pressure pump delivers fuel in two drillings along the heading to feed all six injectors.

The injectors have no solenoids. allowing them to be small enough to fit in the centre of the combustion chamber. The solenoids (four instead of six) are relocated to the pump/metering unit that bolts to the side of the head next to the fuel injection cam. A gear drives from the cam to the pump and mating drillings carry the fuel into the head.

A powerful new electronic control module offers real-time pressure control so fine that it is possible to "••••••••••— pulse the fuel system at the precise instant the port opens at the individual injector. So while this is a common rail system it also has individual injection control.

See next week's Commercial Motor for full details.

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