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There were three significant historical developments that shaped the modern gasoline engine. The first contribution, made by Nikolaus Otto in 1876, was a workable four-stroke internal combustion gasoline engine called the “Otto cycle engine” which he later adapted for use in a motorcycle. His four-stroke gasoline engine would become the model for which all future liquid-based engines would be based on.

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Fuel cells are a viable alternative for powering vehicles but are very expensive and still years away from mass production. With fuel costs escalating, hydrogen-boosted gasoline engines offer many clear advantages; namely fuel economy, lower emissions, and greater cost-efficiency in terms of production.

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Most vehicles on the road today are built with piston-and-cylinder four-stroke gasoline engines. Nikolas Otto, as mentioned above, first developed the piston-and-cylinder four-stroke engine in 1876. In the four-stroke cycle, an ignitable mixture of gas and air are drawn through an intake inside the cylinder. This is known as the intake stroke. This mixture is then compressed as the inside the cylinder is driven upwards near the end of a second stroke, the compression stroke, with the intake valves being closed off. At the end of the compression stroke, a charge is ignited by an electric spark generated from . What follows is a third stroke, known as a power stroke. Both intake valves remain closed and as a result of ignition, the gas and air mixture inside the cylinder burn off and expand, applying pressure on the piston in a downward movement. As the piston ascends in a fourth and final stroke, it opens an exhaust valve where the gas byproducts from combustion are released through. This entire cycle is repeated again and again and is contingent on four-strokes of the piston and two revolutions of the .

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Piston-and-cylinder engines rely on pressure created from combustion to force a piston to move the cylinder in to a back-and-forth or reciprocating motion. In fact, piston-and-cylinder engines are also referred to as reciprocating engines as a result of the motion generated by the piston against the cylinder. The piston is driven away from the cylinder’s head and mechanical energy is produced. In a rotary engine, also known as a Wankel engine, the pressure from gas is applied to rotor surfaces that propel the rotor into motion and produce mechanical energy.

A gasoline engine is a type of internal combustion engine that burns gasoline for fuel

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With a hydrogen-boosted gasoline engine, a small amount of hydrogen is produced with an on-board reformer and then added to the initial intake of gas and air mixture drawn in to the engine. This provides nearly twice the amount of air for a given amount of fuel taken into the combustion chamber. This process is much more energy efficient because the pumping of the engine is minimized with the intake of hydrogen. In fact, the combination of hydrogen and gasoline can net fuel-economy gains as much as 20 to 30 percent. The use of hydrogen also eliminates a need for external mono-nitrogen oxides emissions control. The hydrogen-boost is also easily integrated with a conventional gasoline engine as a bolt-on technology. Prototypes are currently being installed and tested on sports utility vehicles (SUVs) with the technology to be marketed and produced by 2010.

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Sir Dougald Clerk first developed the two-stroke piston-and-cylinder engine in 1878. Since then, the engine’s design has essentially stayed the same as the original, though some simplifications to its mechanics have been made. In Clerk’s design, both the compression and power stroke of the four-stroke cycle were implemented into the intake and exhaust strokes, resulting in only one revolution of the . The two-stroke engine therefore accomplishes in two piston strokes what the four-stroke engine does in four. This produces is a relatively high-powered engine that is used to operate everything from portable, lightweight equipment and devices such as lawnmowers and motorcycles to larger applications like locomotives. One of the disadvantages of this type of gas engine is that it tends not to be as fuel efficient as a four-stroke gas engine.

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The Wankel engine, conceived by German engineer Felix Wankel, is radically different in design and mechanics than the conventional piston-and-cylinder four-stroke gasoline engine. The engine can be described as an equilateral triangular orbiting .