Ford Shelby GT350 Mustang Exceeds 100 Horsepower Per Liter with New 5.2-Liter Flat-Plane V8
- At 102 horsepower per liter, the all-new 5.2-liter V8 for Shelby GT350 Mustang and Shelby GT350R Mustang is both the most power-dense and the most powerful naturally aspirated road-going engine in Ford history
- All-new Ford 5.2-liter flat-plane crankshaft V8 – an engine unique to Shelby GT350 and Shelby GT350R – produces 526 horsepower and 429 lb.-ft. of torque
- With a redline of 8,250 rpm, the all-new 5.2-liter engine is the highest-revving production V8 in Ford history
Its crankshaft may be flat, but its power output is anything but “plane.”
Better engine breathing delivers optimal power
Traditional cross-plane crankshaft V8 engines attach the piston-carrying connecting rods to the crankshaft at 90-degree intervals, creating a “cross” of counterweights when viewed down the axis of the crankshaft. In the all-new Ford 5.2-liter V8, the connecting rods attach to the flat-plane crankshaft at aligned 180-degree intervals – creating what looks like a flat line of counterweights when viewed down the axis of the crankshaft.
Beyond a change in the characteristic sound of an American V8, the flat-plane crankshaft helps improve cylinder exhaust-pulse separation by allowing a firing order that alternates ignition events between the V8’s two cylinder banks. This can vastly improve engine breathing, and subsequently allow the engine to make more power.
The result in the new 5.2-liter V8 – in addition to a uniquely exotic, delicious engine note – is 526 horsepower at 7,500 rpm and 429 lb.-ft. of torque at 4,750 rpm. Even more impressive is the track-tuned flexibility of the engine’s exceptionally wide powerband. It produces 90 percent of peak torque from approximately 3,450 rpm through 7,000 rpm, and features a racetrack-friendly spread of nearly 3,000 rpm between its torque and horsepower peaks.
In both Shelby GT350 and Shelby GT350R, the all-new 5.2-liter will be paired with a six-speed manual transmission as its only gearbox option. The Tremec TR-3160 six-speed manual is specifically engineered for less mass and high-rpm application in the new Shelby Mustangs. The six-speed features a lightweight, die-cast aluminum case and clutch housing for increased overall powertrain stiffness. Gear cross-sections, the dual-mass flywheel and dual-disc clutch are all optimized for an overall reduction in inertia and weight.
Other aspects of the new 5.2-liter V8 (actual displacement is 5,163 cubic centimeters) include a slightly oversquare bore and stroke of 94x93 millimeters, and a performance-enhancing 12.0:1 compression ratio. Computer numerical control-machined cylinder heads house camshafts that develop a massive 14 millimeters of lift for both the hollow-stem intake valves and sodium-filled exhaust valves. A single, fast-acting 87-millimeter throttle body – the largest ever used for a Ford engine – feeds air to the engine, allowing for a simpler, lighter intake.
Further reducing engine weight is a unique new aluminum engine block featuring Ford’s patented plasma transferred wire arc cylinder-liner technology. This process eliminates typical heavy iron cylinder liners with a deposition process. The forged-steel flat-plane crankshaft is “gun drilled” to reduce total engine weight and to improve bay-to-bay cylinder breathing. A lightweight, high-capacity composite oil pan contains baffling designed for sustained high-speed cornering and hard braking.
“A new Mustang as exceptional as the Shelby GT350 deserves an equally extraordinary engine,” said Dave Pericak, director, Ford Performance. “The all-new naturally aspirated 5.2-liter V8 perfectly fits the balanced dynamics of the Shelby GT350, and we believe this new engine will become a performance legend.”
