The 6.2-liter gasoline V8 might not be the headline-grabbing beast the Power Stroke is, at least not in the Super Duty, but when it makes its way into the F150 Raptor people will most certainly be defecating bricks. The second all-new engine debuting with the Super Duty platform, the 6.2 liter V8 will reportedly produce more horsepower than the 310 HP 6.8 liter V10 (which will only be available on F350 on up) while delivering class-leading fuel economy. Let's look at how they're doing it.
The new engine is centered on a cast iron block with aluminum heads, two valves per cylinder with a cast-iron crank, cast aluminum pistons and a 9.8:1 compression ratio. It's been optimized for better breathing on both the intake and exhaust side, it's now got two spark plugs per cylinder for a more complete fuel burn, an overbored design which allows for larger valves and promises higher revs with more horsepower. We'll just have to see what it does in terms of torque. It'll also get variable cam timing, so the weight of your foot might have quite an interesting impact from a mileage versus performance perspective.
Still, the engine drops two cylinders and thus weighs less, it's flex-fuel capable (because everyone knows how successful E85 has been on the market) and it's been tested at up to 800 HP. If that's not enough to make gas motor guys swoon, we don't know what is.
ROBUST, FORD TOUGH: ALL-NEW 6.2-LITER GASOLINE ENGINE COMPLEMENTS 2011 FORD SUPER DUTY
* The 2011 Super Duty with the all-new Ford 6.2-liter V-8 engine will deliver significantly improved torque and horsepower as well as class-leading fuel economy; it can run on regular-grade gasoline, E85 or any blend in between
* Optimization of the engine's "breathing" delivers increased horsepower compared with outgoing F-250/F-350 6.8-liter engine
* Base engine performing flawlessly in Ford F-150 SVT Rapor R off-road racing truck, complementing rigorous testing regimen
DALLAS, Sept. 24, 2009 – An all-new 6.2-liter V-8 gasoline engine, which has its roots in Ford Racing powerplants, joins the lineup for the 2011 Ford F-Series Super Duty.
"Our all-new 6.2-liter V-8 engine uses reliable components and proven technology that has been optimized for the high performance and efficiency that our Super Duty customers demand," said Mike Harrison, Ford V-8 engine programs manager. "It delivers not only significantly better torque and horsepower than the outgoing engine, but also improved fuel economy."
Core to the improvements is the adoption of an all-new engine architecture, with increased bore spacing, that allows better engine "breathing" in both the intake and exhaust for more power and more overall efficiency.
A closer look at how the new engine achieves its performance:
* Large bore, shorter stroke: This approach to creating power has its roots in storied Ford racing engines from the past. The 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. Still, peak horsepower is generated at a relatively modest 5,500 rpm.
* 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 helps produce 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: Because of 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 continuously monitors engine performance and applies this real-time learning to optimize 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.
Key features of the new 6.2-liter V-8 gasoline engine include:
* Cast-iron engine block and four-bolt main bearing caps, with cross bolts, for durability
* Aluminum cylinder heads, with two valves per cylinder and two spark plugs per cylinder
* Cast-iron crankshaft, with dual-mode damper
* Forged steel connecting rods
* Cast-aluminum pistons, with cooling jets
* Single overhead camshaft with variable valve timing and roller-rocker shaft valvetrain
* Magnesium cam covers for lighter weight
* Stamped-steel oil pan
* Composite intake manifold
* Stainless-steel fuel rail; port-fuel-injected; mechanical returnless fuel system
* 9.8:1 compression ratio
* E85/flex fuel capable
Performance heritage with proven durability and reliability
The concept of using a large-bore engine to make horsepower is part of Ford's DNA, especially its racing heritage – the famous Ford Boss 302 and 351 engines, for example, pioneered many of the same concepts. Several racing projects proved out the performance, durability and flexibility of the new 6.2-liter V-8 engine architecture.
Among the racing-themed highlights that contributed to the engine's development:
* A 7.0-liter version running on E85 fuel produced 800 horsepower in a winning Mustang drag racing application driven by Don Bowles
* A specially calibrated production-based 6.2-liter engine achieved 500 horsepower and ran flawlessly in the Ford F-150 SVT Raptor R race truck in the 2008 Baja 1000
Testing on the 6.2-liter V-8 included running multiple engines for more than 500 hours at peak torque and peak horsepower as well as customer-correlated 1,000-hour road load tests to ensure dependability for even the toughest Ford F-Series Super Duty customer.
All told, more than 50 engines were put through the dynamometer lab, running a variety of durability and development tests, undergoing extremes far harsher than can be expected – or duplicated – in the real world. Testing also included high-speed durability, crankshaft-torsional evaluation and engine thermal cycling where the running engine is "shocked" from one coolant temperature extreme to the other.
"From the first test on the dynamometer, this engine was very reliable," said Bob DeBona, supervisor, Engine Performance and Development. "The precision that went into the engineering and manufacturing of this engine led to very few tweaks to the block during development. Components such as the crank, connecting rods, heads and intake manifold stayed essentially the same throughout our durability testing, which is a testament to the reliability of this new engine. It's able to pound out the torque, hour after hour, week after week, demonstrating extreme durability."
The new 6.2-liter V-8 gasoline engine will be built at the Romeo (Michigan) Engine Plant.