HOT NEWS  !!! 2017 Chevrolet Silverado 2500
Channel: Otto Car
Date: 2018-04-04

HOT NEWS  !!! 2017 Chevrolet Silverado 2500 - Our drive was on a closed course at Texas Motor Speedway, with seat time divided into two segments: lapping the oval in a 3500 crew-cab dualie, and a two-lap sprint through a short autocross circuit (!) in a crew-cab Z71 2500 model. In both instances, the single, undeniable first impression was the distinct lack of noise produced by the revised Duramax. The previous engine, while not necessarily louder than its competitors, exhibited an instantly identifiable diesel clatter that was of a higher pitched, more brittle nature than that of the Cummins and the Power Stroke.

While key noise-abatement features include sound-dampening rocker covers and a full-length, two-piece damped-aluminum/steel oil pan and front cover, it’s likely that the fresh internals also contribute to the diminished clatter. Nearly every internal component has been modified or upgraded in a quest for greater refinement and power, save for the 90-degree layout of the V-8, the 103.0-millimeter bore, the 99.0-millimeter stroke, and the basic architecture of the valvetrain and its associated gear drive.

The “new” side of the parts ledger includes the crankshaft, cylinder heads, pistons, wrist pins, connecting rods, electronically controlled turbocharger and actuator, oil cooler, fuel system, in-house-developed electronic controls, glow plugs, exhaust-gas-recirculation valve, and the exhaust system. More than just a parts swap, the reengineering was a comprehensive program that yielded not only a quieter, more powerful engine but one with enhanced exhaust-braking capability and lower oxides-of-nitrogen and non-methane hydrocarbon emissions (the latter by a claimed 35 percent). Additional improvements cited by Chevrolet include increased capacity for the diesel-exhaust-fluid tank, a stronger cast-iron engine block, and an air-induction hood scoop that helps maintain cooler engine temperatures under load. Even the six-speed Allison automatic transmission was upgraded with an improved torque converter, which also permits a lockup function when appropriate.


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