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Explore What Is Valvetronic? BMW's Innovative Throttle System with 446,819 views, 7,893 likes, and 1,002 comments. Experience the impact of this video content that has captured audience attention.

What is Valvetronic? Why don't BMWs use throttle valves? While testing the BMW X1, we explore BMW's latest Valvetronic tech. Subscribe for new videos every Wednesday! - https://goo.gl/VZstk7 In most gasoline cars, when you press the gas pedal you’re changing how much the throttle valve opens, a butterfly valve regulating the amount of air that enters the engine. In BMW engines with Vavletronic, however, a throttle valve is not necessary, and when you press the gas pedal you’re altering how much the intake valves open. There is indeed a throttle butterfly valve in these engines, but it is simply used as a failsafe. Under normal operating conditions the valve will always remain fully open. There’s a major efficiency benefit of regulating airflow this way, as it reduces the pumping losses of the engine, particularly at low load operations, or any time you’re not flooring it. With throttle bodies, you have close to atmospheric pressure on the filter side, and a vacuum on the intake manifold side. With Valvetronic, you’ll have near atmospheric pressure directly outside the intake valves, and thus the engine does not have as much resistance to pulling in air, making it more efficient. BMW claims this valve train design improves fuel consumption by at least 10% under practical driving conditions. There are additional benefits to this system as well. With throttle bodies, once you floor it, you have to wait for the air to travel from the throttle body to the intake valve. By using the valves to regulate airflow, and already having nearly atmospheric pressure right outside the cylinder, the intake is immediate and thus the response is improved. Another benefit at low load operations; the valves will only open about .5 mm to about 2 mm, and this small cross sectional area means the air fuel mixture will move rapidly, improving fuel atomization. This also helps with cold starts. And don't forget to check out my other pages below! Facebook: http://www.facebook.com/engineeringexplained Official Website: http://www.howdoesacarwork.com Twitter: http://www.twitter.com/jasonfenske13 Instagram: http://www.instagram.com/engineeringexplained Car Throttle: https://www.carthrottle.com/user/engineeringexplained EE Extra: https://www.youtube.com/channel/UCsrY4q8xGPJQbQ8HPQZn6iA NEW VIDEO EVERY WEDNESDAY!

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