When the 2014 Corvette Stingray was introduced at the Detroit auto show in January, General Motors cited preliminary output figures of 450 horsepower and 450 lb-ft of torque for its all-new 6.2-litre, LT1 small-block V-8 engine.
The LT1 engine is the fifth generation of the Small Block engine family, which debuted in the Corvette in 1955. It displaced 4.3L (265 cubic inches) and was rated at 195 horsepower, drawing air and fuel through a four-barrel carburetor.
The 'base' engine, with standard exhaust system, makes 455 SAE-certified horsepower (339 kW) and 460 lb-ft (624 Nm).
These are the highest standard power ratings ever for the Corvette, and they are combined with fuel-efficiency efficiency that is expected to better 9.1 L/100 km (26 mpg (US)) on the highway, based on U.S. EPA test procedures (which differ from those used for Natural Resources Canada's fuel-consumption calculations).
At 74 hp/L, the LT1 has greater power density than the C6 Corvette’s LS3 6.2L engine and even the C6 Z06’s racing-derived 7.0L LS7.
Combined with the Stingray's light weight, the car will accelerate from 0-to-100 km/h in close to four seconds, by GM's estimate.
The new LT1 engine’s high output, high power density and high efficiency result from a combination of several advanced technologies, including direct injection, Active Fuel Management (cylinder deactivation at low loads) and continuously variable valve timing, which support an advanced combustion system.
Emissions are also reduced, particularly cold-start hydrocarbon emissions, which are cut by about 25 percent.
The engine's advanced combustion system incorporates a new cylinder-head design and a new, sculpted piston design that is an integral contributor to the high-compression and fuel-air mixture motion parameters enabled by direct injection.
Additional engine features include:
- Advanced oiling system with oil-spray piston cooling and available dry-sump oiling
- Engine-mounted, camshaft-driven fuel pump to support the direct injection system
- Intake manifold with "runners in a box" design that allows for high-efficiency airflow packaged beneath the Corvette’s low hood line
- High-flow, four-into-one exhaust manifolds based on the design of the LS7 engine.
The 2014 Corvette Stingray coupe goes on sale this fall, with a convertible model following by the end of the year.