Wide open throttle

Wide open throttle (WOT) refers to an internal combustion engine's maximum intake of air and fuel that occurs when the throttle plates inside the carburetor or throttle body are "wide open", providing the least resistance to the incoming air. In the case of an automobile, WOT is when the accelerator is depressed fully, sometimes referred to as "flooring it".

At WOT, manifold vacuum decreases. The higher manifold pressures in turn allow more air molecules to enter the combustion cylinders, and thus additional molecules of fuel are required to balance the combustion reaction. The additional molecules of air and fuel reacting together produce more power. Ideally, to preserve driveability and fuel economy, manifold vacuum should not fall any lower than 1 inHg (3.4 kPa).^{[citation needed]}

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