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"The engine block on the 4.6L is constructed of aluminum alloy; the previous 4.7L was cast iron," [Natae Rayner] explains. "That saves about 100 lbs. and improves fuel efficiency. The use of Toyota's WT-i variable valve timing with intelligence has also been expanded. The new engine uses dual independent WT-i on intake and exhaust camshafts. The previous 4.7L had WT-i on just the intake camshafts."
Trucks I & Transportation Pickup Technology Trims Fuel Costs Powertrain and aerodynamic advances yield performance gains. By Curt Bennink A lthough pickup sales figuratively fell off a cliff, manufacturers have resisted the temptation to rein in technical innovation. In fact, competition contin- ues to heat up, with manufacturers producing more efficient powertrains and which makes it stiffer. The overall stiffness of the turbocharger keeps vibration of that subsystem from being transmitted in all adjacent components in the engine, making for an overall quieter turbocharger on the engine.” improving aerodynamics to squeeze out the best mileage possible. “Another key technology is a 30,000-psi high-pressure fuel injection system,” While some changes are an evolution of existing products, there are also revo- Gryglak adds. “The higher system pressures allow us to deliver power, torque lutionary innovations that promise to shake up the status quo. and fuel gains.” To achieve tailpipe emissions, Ford is introducing a selective catalytic reduc- tion (SCR) aftertreatment system. “The overall system is packaged in an in-line torpedo fashion,” says Gryglak. “We also have a DEF tank that supplies the urea dosing injector. We have aligned our DEF service interval to match with the oil change interval on the platform. Our oil change interval is 7,500 miles.” In addition to the new diesel, the company is also beefing up its 6.2-liter gasoline V8 engine. “It has bigger pistons. It has bigger intake valves and bigger intake and exhaust manifolds,” notes Chris Brewer, Super Duty chief nameplate engineer. “The result is a more powerful and more durable powerplant capable of running conventional gasoline, as well as E85 fuel.” Both Super Duty engines are mated with an all-new TorqShift six-speed transmission. “Bigger and stronger gears allow this automatic transmission to handle the extra power and torque that our new engines will produce,” says Brewer. A new feature is a live drive power take-off. “Live drive PTO enables a transmission to power auxiliary equipment while idling and, more importantly, while on the move.” General Motors focuses on fuel savings Both the Chevy Silverado and GMC Sierra powertrains deliver enhanced fuel economy. “We have improved our fuel efficiency for 2010 pretty much across the The all-new Ford 6.3-liter Powerstroke board,” states Tony Truelove, marketing manager for the Chevrolet Silverado. diesel engine for 2011 Super Duty models One contributor is the development of a fuel saver mode, which allows the includes such unconventional features as a compacted graphite iron block, aluminum trucks to make better use of GM’s Active Fuel Management system. “The fuel heads with inboard exhaust and a single saver mode is built into the calibration of all of our 5.3-liter engines,” says sequential turbocharger. Truelove. It enables more aggressive active fuel management by running the engine on four cylinders in light throttle conditions vs. eight. “The fuel saver mode is a calibration that keeps the engine in four-cylinder Ford renovates operation longer to improve fuel economy,” adds Carl Hillenbrand, Silverado diesel offering product manager. “From a hardware perspective for 2010, there is not anything For its 2011 Super Duty trucks, which significantly changed [with the engines].” should hit the showroom this spring, Ford has designed and will manufacture
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