Thermal and acoustic management in a unique exhaust system design for first-ever mid-engine Corvette
Tenneco has confirmed that it is to supply advanced exhaust and powertrain technologies for the 2020 Chevrolet Corvette.
Tenneco’s Clean Air and Powertrain Business Groups supply the complete cold-end exhaust system, as well as a range of components for the eighth generation sportscar’s small block V-8 LT2 engine.
Patrick Guo, executive vice president for Tenneco and president for Clean Air, said: “Corvette’s mid-engine architecture required creative technical solutions to accommodate the packaging and thermal requirements of the emissions system.
“We partnered with GM, combining our experience in system integration with Corvette’s engineering team to deliver technologies that help to enable a more efficient, high-performance vehicle with reduced emissions.”
Sophisticated emissions systems for high-performance vehicles often incorporate active valves that can vary system backpressure in order to provide the right balance of performance, sound characteristics and regulatory compliance.
The Corvette’s emissions system features up to four electronic valves supplied by Tenneco.
The standard exhaust unit is equipped with two newly developed valves with enhanced heat resistance designed to work in concert with the vehicle’s active fuel management system to support the engine’s cylinder deactivation function for optimum efficiency and lower emissions.
These valves open and close to control the Corvette’s exhaust sound as it switches between the two engine modes.
The optional performance exhaust incorporates two additional electronic valves at the rear that provide greater acoustic differentiation, helping to create the vehicle’s signature sound.
Tenneco developed a series of thermal solutions that enable the Corvette’s emissions system to more effectively manage the high temperatures that result from the mid-engine vehicle architecture.
Solutions include the use of advanced, multi-layer heat shields designed to prevent unwanted heat transfer to surrounding components as well as a new valve arrangement with decoupled design that reduces heat impact on the valve´s electronics.
“A significant step forward in actuated valve design”
“This innovative valve arrangement, with the actuator decoupled from the valve body, is a significant step forward in actuated valve design and, when combined with our latest developments in valve materials, enables use on mid-engine and other architectures with extremely high exhaust temperatures,” explained Dmitri Konson, vice president for global engineering at Tenneco Clean Air.
Tenneco’s Powertrain Business Group also supplies a range of engine components for the iconic high-performance small block V-8 LT2 including pistons, piston rings, bearings, bushings, valve seats, valve guides, and systems protection products.
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