Thread: Engine Braking
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Old 10-02-2012, 11:22 PM   #14 (permalink)
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But it is the point of highest efficiency...

Originally Posted by wobombat View Post
Why is it not then the case that the point of highest torque is the point of highest efficiency?
i think you answered your own question.

The peak torque that an engine generates does occur at the point of highest volumetric efficiency--when the airflow has the least restriction and the most power is made with the least amount of fuel. The engine speed that this occurs is the ratio of the power:torque.

Engines don't make speed, they make torque. Speed is what results when the load torques equal the generated torque from burning a certain amount of fuel.

Plot torque on the x-axis and speed on the y-axis of a BSFC chart with arcs of constant power to see this graphically.
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