New Corvette Z06 is GM’s most powerful production car

Supercharged V-8 is rated at 650 horsepower

2014-06-06


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DETROIT – The all-new Corvette Z06 is the most powerful production car ever from General Motors and one of a few production cars available in the United States that delivers more than 600 horsepower.

The Z06’s supercharged 6.2L V-8 engine is SAE-certified at 650 horsepower (485 kW) at 6,400 rpm and 650 881 Nm at 3,600 rpm. The horsepower data for Europe will be announced closer to the launch early next year.

“The LT4 Small Block sets a new benchmark for power and torque at GM,” said Steve Kiefer, vice president, GM Powertrain Engineering. “The engine also puts the Corvette Z06 on par with the most powerful supercars offered in America, while delivering performance with impeccable manners that make it suitable for daily driving.”

“Torque is the pulling power of an engine and the LT4’s abundance of it at every rpm in the engine’s speed range helps the new Corvette Z06 accelerate quicker and respond nearly instantaneously,” said Jordan Lee, chief engineer for Small Block engines. “It’s the very definition of power on demand.”

The new Z06 engine produces 40 percent more peak torque (244 Nm) than the previous-generation’s 7.0L LS7 engine – and 7.5 percent more than the supercharged 2013 Corvette ZR1’s (819 Nm. At 3,200 rpm, the new LT4 surpasses the LS7 by 208 252 N).

“The new LT4 engine builds on the design strengths of our previous supercharged engine and leverages the technologies introduced on the Corvette Stingray – direct injection, cylinder deactivation and continuously variable valve timing – to take Corvette performance to an all-new plateau,” said Lee. “Our new, very compact supercharger also helps the engine make power more quickly, and perhaps more importantly, it helps produce more torque earlier in the rpm band.”

“It’s also worth mentioning that the LT4’s supercar performance numbers are achieved with an engine that is nearly the same size as the very compact LT1 engine introduced in the 2014 Corvette Stingray,” Lee said. “The power density of the LT4 makes it one of the smallest and lightest 650-hp engines in the industry.”

LT4 details

The new LT4 engine is based on the same Gen 5 small block foundation as the Corvette Stingray’s LT1 6.2L naturally aspirated engine, incorporating several unique features designed to support its higher output and the greater cylinder pressures created by forced induction, including:

  •  Rotocast A356T6 aluminum cylinder heads that are stronger and handle heat better than conventional aluminum heads
  • Lightweight titanium intake valves
  • Machined, forged powder metal steel connecting rods for reduced reciprocating mass
  •  High 10.0:1 compression ratio – for a forced-induction engine – enhances performance and efficiency and is enabled by direct injection
  • Forged aluminum pistons with unique, stronger structure to ensure strength under high cylinder pressures
  • Stainless steel exhaust manifolds and an aluminum balancer that are lighter than their LT1 counterparts
  • Standard dry-sump oiling system with a dual-pressure-control oil pump.

A new 1.7L supercharger spins at up to 20,000 rpm – 5,000 rpm more than the supercharger on the Corvette ZR1’s engine. The rotors are smaller in diameter, which contributes to their higher-rpm capability – and enables them to produce power-enhancing boost earlier in the rpm band. That boost is achieved more efficiently via a more direct discharge port that creates less turbulence, reducing heat and speeding airflow into the engine.

“The Small Block’s cam-in-block design heritage has always enabled very high performance and responsiveness in a small, compact package – an attribute amplified by the performance of our new supercharger’s design,” said Lee.

The LT4 is assembled at the new Performance Build Center at GM’s Bowling Green Assembly Plant and at GM’s Tonawanda engine plant in New York. It is matched with a standard seven-speed manual transmission or an all-new, paddle-shift eight-speed automatic transmission built in Toledo, Ohio.

Designed to deliver shift responses on par with the world’s best dual-clutch transmissions, it is the first automatic offered in a Z06. It also makes the Z06 one of the few cars this powerful to offer the choice of a conventional manual transmission or an eight-speed automatic.

In Europe, the new Corvette Z06 goes on sale in spring 2015.

Founded in 1911 in Detroit, Chevrolet is the world's fourth largest car brand with annual sales of almost 5 million cars and trucks in more than 140 countries. Chevrolet provides customers with fuel-efficient vehicles that feature spirited performance, expressive design, high quality and Chevrolet MyLink intelligent connectivity. Its European line-up includes the Spark and Aveo city cars, the Trax small SUV, the compact Cruze, the Orlando family van, the Captiva compact SUV, the Malibu mid-size sedan, the legendary Camaro and Corvette sports cars and the extended-range Volt electric car. For more information visit chevroleteurope.com.

2015 "LT4" 6.2L V-8 AFM VVT DI SC (LT4) for Chevrolet Corvette Z

Cutaway rendering of the all-new LT4 supercharged V8 engine for the 2015 Corvette Z06. Seen in the rendering is componentry that makes the new engine one of the most technologically advanced V8s in the industry including an advanced supercharger, direct fuel injection, Active Fuel Management (cylinder deactivation), continuously variable valve timing and a variable displacement oil pump.

Photos

2015 Corvette Z06

The 2015 Corvette Z06 belongs to an elite set of production vehicles offered in America with over 600 horsepower.

The all-new LT4 supercharged 6.2L V-8 peak torque and horsepower

The all-new LT4 supercharged 6.2L V-8 peak torque and horsepower figures are certified for accuracy by SAE. The LT4 maintains 90 percent of its peak torque, or 592 lb-ft (802 Nm), from 2,500 to 5,400 rpm.

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