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Difference between revisions of "Straight-four"
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The smallest production motorcycle inline-four engine was the [[four-stroke engine]] powered the 231 cc Benelli/Moto Guzzi 254. For racing, Honda built inline-four engines as small as a 125 cc for the Honda 125/4. This engine was replaced by a 125 cc [[straight-five engine]]. The largest proprietary inline-four engine in a commercially-produced motorcycle is the 1402 cc engine in the [[Suzuki GSX1400]]. | The smallest production motorcycle inline-four engine was the [[four-stroke engine]] powered the 231 cc Benelli/Moto Guzzi 254. For racing, Honda built inline-four engines as small as a 125 cc for the Honda 125/4. This engine was replaced by a 125 cc [[straight-five engine]]. The largest proprietary inline-four engine in a commercially-produced motorcycle is the 1402 cc engine in the [[Suzuki GSX1400]]. | ||
Modern inline-four motorcycle engines first gained their popularity with [[Honda]]'s [[overhead camshaft#Single overhead camshaft|SOHC]] [[Honda CB750|CB750]] in the 1970s. Since then, the inline-four has become one of the most common engine configurations in street bikes. Outside of the [[cruiser (motorcycle)|cruiser]] category, the inline-four is simply the most common configuration because of its relatively high performance-to-cost ratio. All of the Japanese motorcycle manufacturers offer motorcycles with inline-four engines, as does [[MV Agusta]] and [[BMW motorcycles|BMW]] who employ both [[longitudinal engine|longitudinal]] and [[transverse engine|transverse]]-mounted engines. Even the modern [[Triumph Motorcycles Ltd|Triumph]] company has offered inline-four-powered motorcycles, though they were discontinued in | Modern inline-four motorcycle engines first gained their popularity with [[Honda]]'s [[overhead camshaft#Single overhead camshaft|SOHC]] [[Honda CB750|CB750]] in the 1970s. Since then, the inline-four has become one of the most common engine configurations in street bikes. Outside of the [[cruiser (motorcycle)|cruiser]] category, the inline-four is simply the most common configuration because of its relatively high performance-to-cost ratio. All of the Japanese motorcycle manufacturers offer motorcycles with inline-four engines, as does [[MV Agusta]] and [[BMW motorcycles|BMW]] who employ both [[longitudinal engine|longitudinal]] and [[transverse engine|transverse]]-mounted engines. Even the modern [[Triumph Motorcycles Ltd|Triumph]] company has offered inline-four-powered motorcycles, though they were discontinued in favor of a [[Triumph Triple|triple]]. | ||
The 2009 [[Yamaha R1]] has an interesting inline-four engine that does not fire at even intervals of 180°. Instead, it uses a [[crossplane]] crankshaft that prevents the pistons from simultaneously reaching top dead centre. This results in increased torque at lower engine speeds. | The 2009 [[Yamaha R1]] has an interesting inline-four engine that does not fire at even intervals of 180°. Instead, it uses a [[crossplane]] crankshaft that prevents the pistons from simultaneously reaching top dead centre. This results in increased torque at lower engine speeds. | ||