Car Manufacturer News
LT1 Swaps in the Future? New Tech
General Motors and the latest small-block V-8, 6.2-liter, is 99% new and called LT1 for the 2014 Chevrolet Corvette. Billed as the biggest change to the venerable small block V-8 engine in its 57-year history, the Gen-5 edition retains the trademark bore spacing, overhead-valve/cam-in-block valvetrain, and a few other key details, but the engine bristles with high-tech features. Direct fuel injection? Check. Variable valve timing? Got-it. The above was widely leaked common knowledge, but now we can tell you the rest of the story. Some 99.9 percent of the engine is new, with the engine’s carryover parts fitting in a Ziploc bag. Two starter bolts, a piston pin and a retainer bolt or two are all that remain of the LS3. Zero-to-60 mph performance for the new base Corvette is expected to be under 4 seconds. Efficiency is increased, making this one of the most fuel efficient 450-hp vehicles available. That’s right, an estimated 450 horsepower at 6000 rpm and 450 lb-ft of torque at 4000 rpm.
Displacement is indeed 6.2 liters, not 5.5 liters as rumored, and the RPO number is LT1, a designation well-known to the Corvette faithful. The key enabling feature of the new small block is cylinder deactivation. The Corvette was to be first with that technology, but the layout of the car was unsuited because of the rear transmission and various mounting solutions, it was an NVH nightmare in 4-cylinder mode. Those problems have been overcome now, and the system has been optimized to allow a wide operating range in the 3.1-liter V-4 mode. As it turns out, fuel economy is BETTER with a 6.2-liter engine, because smaller displacements reduce the amount of time the engine can operate in 4-cylinder mode, so bigger displacement saves more fuel. Counterintuitive, but true. Active Fuel Management applied to a performance valvetrain is unique, Chevy says. With its 6600-rpm engine speed fuel cutoff, this is the highest-speed valvetrain with cylinder deactivation. Cylinders 1, 7, 6, and 4 get deactivated.
The all-new C7 Corvette will make its debut in just a few months at the 2013 Detroit auto show. Keep checking back for all the latest Corvette news.
Read more: Motor Trend
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