Top 100: Mercedes Simplifies EGR; Automates a Six-Speed

September 28, 2010

Mercedes-Benz Engine.Mercedes-Benz used reed valves instead of multiple flap-type valves and a wastegate turbocharger rather than variable geometry turbo in the exhaust-gas recirculation (EGR) system for its six-cylinder MBE4000 and four- and six-cylinder MBE900s. The MBEs cost less than most competitor engines when installed in Freightliner, Sterling and Western Star. The 12.8-liter MBE4000 (with ratings up to 450 horsepower at 1,550 pounds-feet of torque) weighs 2,117 pounds, as much as 330 pounds less than competitive diesels.

Mercedes-Benz AGSMercedes also brought the Automated Gear Shift (AGS) transmission to North America for Freightliner and Sterling mid-range trucks. The electro-hydraulic shifting mechanism makes an automatic out of a six-speed synchromesh gearbox. SmartShift allows the operator to override the computer and manually upshift or downshift by pulling or pushing a stalk mounted to the steering column.

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