Engine Corner Graphic
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4 Stroke Cycle
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Rotary Engine
Flat Engine
O Engine
Engine Overview

engine cutaway, click to see enlarged pictureThe engine is considered by most to be the defining factor of an automobile. It provides the motivational force for the vehicle and drives the electrical and auxiliary systems required for operation. The internal combustion engine changes energy forms to provide propulsion. Combustible materials are detonated to create a forceful explosion (and thus expansion of gasses) that is then converted into some form of rotational motion. This rotational force or torque is then applied to the wheels to provide linear motion. Engines can consist of two of four cycle piston units, turbines, rotary units, or free piston units. The most common is the four cycle piston engine.
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Horsepower is a unit used to measure the power output of an engine. One horsepower is the amount of power needed to lift 33000 pounds to a height of one foot in one minute. A horsepower rating is usually the maximum power that the engine can produce. Horsepower is very sensitive to engine rotation speeds and engine designs.

Torque is the twisting force that is exerted by a power source (engine). It is similar to horsepower in that it is a measuring tool explained in units called foot-pounds. Torque can be calculated using a stationary device called a dynamometer or from calculations using horsepower and rpm.