The new Stingray continues to wow journalists around the world. This time it’s what is under the hood of the 2014 Corvette – a totally reengineered LT1 V8 engine – that’s earning the applause. WardsAuto names Ward’s 10 Best Engines each year, and last month they announced that Chevrolet has two winners – the Stingray’s [...]
There’s no doubt that the new Gen 5 Small block engines found in the Corvette Stingray and the Chevrolet Silverado are the most technologically advanced engines that Chevrolet has ever built. But concerns about some of the new fuel savers like direct injection, variable valve timing and the active fuel management means that tuners will [...]
Two of Chevrolet’s brains behind the scene say they believe the 2014 Corvette Stingray accomplished all its goals, with nothing left behind on the cutting-room floor. “I don’t think there was anything,” says Roger Clark, senior manager energy center. “We got virtually everything we needed in the Stingray, and we’re absolutely delighted with the results
The 2014 Corvette Stingray’s all-new LT1 6.2L V-8 engine is SAE-certified at 460 horsepower at 6,000 rpm and 465 lbs-ft of torque at 4,600 rpm, with the available performance exhaust system. The Stingray is SAE-certified at 455 horsepower and 460 lbs-ft with the standard exhaust system. They are the highest standard power ratings ever for the Corvette, delivered with efficiency that is expected to exceed 26 mpg on the highway.
“The 2014 Corvette Stingray’s LT1 engine is a triumph of advanced technology, delivering more power and torque than ever before with greater efficiency,” said Jordan Lee, Small Block chief engineer. “The LT1’s performance complements the Corvette’s low mass with a tremendous feeling of power that builds as the rpm climbs. Drivers will experience more power and acceleration than ever before with the standard engine – in fact, its power and torque surpass many uplevel engines offered by competitors.”
At 74 horsepower per liter, 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. It also produces comparable torque to the LS7 – up to 4,700 rpm – and its peak torque is within five lbs-ft of the 7.0L engine. That torque is generated early and sustained across the rpm band, with 316 lbs-ft available at only 1,000 rpm and 90 percent of peak torque available from 3,000 rpm to 5,500 rpm – giving the lightweight Corvette Stingray excellent acceleration at all speeds.
The new LT1 engine’s high output, and high power density and efficiency are due to several advanced technologies, including direct injection, Active Fuel Management and continuously variable valve timing, which support an advanced combustion system. Direct injection is a primary contributor to the engine’s combustion efficiency, ensuring a more complete burn of the fuel. Direct injection also keeps the combustion chamber cooler, which allows for a higher compression ratio. Emissions are also reduced, particularly cold-start hydrocarbon emissions, which are cut by about 25 percent. Active Fuel Management, or cylinder deactivation, is a first-ever application on Corvette. It helps save fuel by imperceptibly shutting down half of the engine’s cylinders in light-load driving. Continuously variable valve timing is refined to support the LT1 AFM and direct injection systems to further optimize performance, efficiency and emissions.
These technologies support the all-new, advanced combustion system, which incorporates a new cylinder-head design and a new, sculpted piston design that is an integral contributor to the high-compression, mixture motion parameters enabled by direct injection.
In yesterday’s official announcement from GM that named 49ers Coach Jim Harbaugh as the official driver of the 2014 Corvette Stingray Pace Car for the Indy 500, there was a paragraph that described the known performance specs for the new C7 sports car. According to the release, the 6.2L LT1 V8 makes 455 horsepower, not