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".
In the case of a diesel engine, which does not have a throttle valve, WOT is the point at which the maximum amount of fuel is being injected relative to the amount of air pumped by the engine, generally in order to bring the fuel-air mixture up to the stoichiometric point. If any more fuel were to be injected then black smoke would result.
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).
Famous quotes containing the words wide, open and/or throttle:
“My love grows wide and shallow in an effort to spread my losses.”
—Mason Cooley (b. 1927)
“The world is a puzzling place today. All these banks sending us credit cards, with our names on them. Well, we didn’t order any credit cards! We don’t spend what we don’t have. So we just cut them in half and throw them out, just as soon as we open them in the mail. Imagine a bank sending credit cards to two ladies over a hundred years old! What are those folks thinking?”
—Sarah Louise Delany (b. 1889)
“Casey Jones, mounted to the cabin,
Casey Jones, throttle in his hand,
Casey Jones mounted to the cabin,
Took his farewell journey to the Promised Land.”
—Unknown. Casey Jones (l. 49–52)