6.2L motor details from the new 2011 Super Duty press release:
New gasoline engine delivers more torque, horsepower than outgoing model
Ford tapped into a bit of its proud racing heritage to create the new 6.2-liter V-8 gasoline engine, which uses big-bore architecture to produce horsepower and class-leading fuel economy. The V-8's large bore (102 mm) allows for larger intake and exhaust valves for improved engine breathing, and the short stroke (95 mm) allows higher engine speed for increased horsepower.
Benefits of the new 6.2-liter V-8 gasoline engine include:
* SOHC valvetrain with roller-rocker shafts: The single overhead camshaft (SOHC) per cylinder head design results in a stiff valvetrain that allows optimized camshaft lift profiles and results in great low-speed torque. The roller-rocker shafts allow valve angles to be splayed, resulting in optimized intake and exhaust port layout for better breathing.
* Dual-equal variable cam timing: Intake and exhaust valve opening and closing events are phased at the same time to optimize fuel economy and performance throughout the engine speed range and throttle positions.
* Two spark plugs per cylinder: Due to the large bore size, two spark plugs per cylinder are used to more efficiently burn the fuel-air mixture in the combustion chamber, enabling better fuel economy and increased engine torque. The twin plugs also help the engine maintain a smooth, stable idle.
* Dual knock sensors: A knock sensor on each bank of cylinders of the V-8 engine allows the spark timing of each of the cylinders to be individually optimized real time, throughout the engine speed range. The engine learns the optimum timing via an adaptive algorithm.
* Better engine crankcase "breathing" and efficiency: Significant development work and computer-aided engineering optimized the cylinder block for more efficient airflow in the crankcase as the pistons move up and down in the bores, resulting in improved torque at higher engine speeds. Piston-cooling jets squirt oil on the underside of the pistons to keep the piston crowns cool under extreme operating conditions. The cooling jets also allow for a higher compression ratio for better engine efficiency and faster engine oil warm-up on cold starts, also improving fuel economy.