In the red corner, weighing in at 6.2 liters of displacement, we have GM’s new 6.2 liter V8 (L86). The naturally-breathing engine makes 420 horsepower and 450 lb-ft of torque in the all-new 2014 Silverado and 2014 Sierra, using the trusted small-block push-rod setup, but with a few modern technologies, including Variable Valve Timing, Cylinder Deactivation (or Active Fuel Management/AFM), and Direct Injection.
In the blue corner, weighing in at 3.6 liters of displacement, we have another new GM engine: a twin-turbocharged 3.6 liter V6 (LF3). The boosted six-banger also makes 420 horsepower, but 430 lb-ft of torque in the all-new 2014 Cadillac CTS. The engine is as power-dense as they get (116 horsepower per liter), representing the state-of-the art in powerplant engineering and design, through and through.
As you may have expected, both engines take entirely different approaches to optimizing the modern internal combustion engine, but put out the same amount of power and sport similar torque figures. As it stands, The General can pick and choose the best engine for the appropriate application — using the big and burly V8 for trucks, and the smaller, boosted six-pot for sports cars.
Feast your eyes on the similarities, and on the differences:
|METRIC||6.2L V8 L86||3.6L V6 TT LF3|
|TYPE||6.2L V8||3.6L V6 TWIN TURBO|
|VALVETRAIN||OVERHEAD VALVE, TWO VALVES PER CYLINDER, VARIABLE VALVE TIMING||DUAL OVERHEAD CAM, FOUR VALVES PER CYLINDER, VARIABLE VALVE TIMING|
|FUEL DELIVERY||DIRECT HIGH-PRESSURE FUEL INJECTION||DIRECT HIGH-PRESSURE FUEL INJECTION|
|RECOMMENDED FUEL||REGULAR UNLEADED OR E85||PREMIUM REQUIRED|
|MAXIMUM ENGINE SPEED||6000||6500|
|POWER HP / kW @ RPM||420 / 313 @ 5600||420 / 313 @ 5750|
|TORQUE LB-FT / Nm @ RPM||450 / 610 @ 4100||430 / 583 @ 3500 – 4500|