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Difference between revisions of "V-twin"
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| pages = 11–6}}</ref> however, some sources, most prominently [[Moto Guzzi]], use the terminology in the opposite way. | | pages = 11–6}}</ref> however, some sources, most prominently [[Moto Guzzi]], use the terminology in the opposite way. | ||
A Moto Guzzi Technical Services representative tried to explain to | A Moto Guzzi Technical Services representative tried to explain to LA Times columnist Susan Carpenter that Moto Guzzi engines are "called 'transverse' because the engine is mounted with the crankshaft oriented front to back instead of left to right."<ref>{{ | ||
Citation |last=Carpenter |first=Susan|title=Chaps aren't de rigueur, but a helmet, yes|work=ASK THROTTLE JOCKEY |url=http://www.latimes.com/classified/automotive/highway1/la-hyw-qa25jul25,1,2706840.story |quote= | Citation |last=Carpenter |first=Susan|title=Chaps aren't de rigueur, but a helmet, yes|work=ASK THROTTLE JOCKEY |url=http://www.latimes.com/classified/automotive/highway1/la-hyw-qa25jul25,1,2706840.story |quote= | ||
According to my source at Moto Guzzi Technical Services, "The Guzzi engine is a 90-degree 'L' twin, actually, because the cylinders are oriented at 90 degrees, instead of a typical V twin that has a smaller angle ( 60-degree, 77-degree, etc.). It is called 'transverse' because the engine is mounted with the crankshaft oriented front to back instead of left to right. Because of this you cannot run a chain or belt drive directly to the rear wheel like in most motorcycles. This is why you have a separate gearbox that bolts to the engine and transfers the power to the rear wheel via the drive shaft. This is how it is done on the Moto Guzzi and a BMW. | According to my source at Moto Guzzi Technical Services, "The Guzzi engine is a 90-degree 'L' twin, actually, because the cylinders are oriented at 90 degrees, instead of a typical V twin that has a smaller angle ( 60-degree, 77-degree, etc.). It is called 'transverse' because the engine is mounted with the crankshaft oriented front to back instead of left to right. Because of this you cannot run a chain or belt drive directly to the rear wheel like in most motorcycles. This is why you have a separate gearbox that bolts to the engine and transfers the power to the rear wheel via the drive shaft. This is how it is done on the Moto Guzzi and a BMW. | ||
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=== Longitudinal crankshaft mounting === | === Longitudinal crankshaft mounting === | ||
The longitudinal crankshaft two-cylinder V as seen on [[Moto-Guzzi]]s and some [[Honda]]s is less common. This orientation is well suited for [[driveshaft|shaft drive]] by eliminating the need for a 90° [[bevel gear]] at the transmission end of the shaft. In motorcycles, a longitudinal engine fits well inside the frame, and aids cooling because both heads protrude out into the air. <ref name=Coombs/> However this approach has the slight disadvantage in motorcycles of causing a torque reaction that tends to lean the motorcycle slightly to one side as the angular rate of the crankshaft increases or decreases. The faster the change, the larger the torque it produces. However, many motorcycle manufacturers have corrected for torque reaction by rotating the transmission input shafts and/or the balance and drive shafts opposite that of the crankshaft so that there is approximately equal mass turning clockwise and counterclockwise at any time, thereby physically canceling the effect. | The longitudinal crankshaft two-cylinder V as seen on [[Moto-Guzzi]]s and some [[Honda]]s is less common. This orientation is well suited for [[driveshaft|shaft drive]] by eliminating the need for a 90° [[bevel gear]] at the transmission end of the shaft. In motorcycles, a longitudinal engine fits well inside the frame, and aids cooling because both heads protrude out into the air. <ref name=Coombs/> However this approach has the slight disadvantage in motorcycles of causing a torque reaction that tends to lean the motorcycle slightly to one side as the angular rate of the crankshaft increases or decreases. The faster the change, the larger the torque it produces. However, many motorcycle manufacturers have corrected for torque reaction by rotating the transmission input shafts and/or the balance and drive shafts opposite that of the crankshaft so that there is approximately equal mass turning clockwise and counterclockwise at any time, thereby physically canceling the effect. | ||
==See also== | ==See also== | ||