Hyundai debuts new Valvetrain dubbed the CVVD
Some say its days are doomed, but car manufacturers are pushing their boundaries with petrol engine tech. Hyundai has come up with a new technology for its engines called the CVVD ie Continuously Variable Valve Duration which they claim can improve performance and efficiency by 4% and 5%, respectively and decrease emissions by 12%.
During constant-speed driving, CVVD leaves the intake valve open until the middle of the compression stroke, closing it near the end. This helps improve fuel efficiency by reducing compression resistance. However, when engine output is high such as when the vehicle is traveling at high speed, the intake valve closes at the beginning of the compression stroke to maximize the amount of air used for combustion, which improves torque, acceleration, and engine performance.
The CVVD system will make its way to the new ‘Smart Stream’ engine family, starting with a new turbocharged 1.6L four-cylinder engine that makes 180hp and 264 Nm of torque. The new Sonata Turbo will be the first to get it towards the second half of this year while it will also filter to Kia products in near future.
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