In 2007, FIM will impose new regulations that MotoGP bikes will be limited to 4 stroke 800cc. The reason given on the reduction of engine cylinder capacity is to increase driver safety, given the power and speed of the resulting peak MotoGP machines has increased dramatically since 2002. The current MotoGP speed record is 347.4 km / h, set by Loris Capirossi with Ducati at the Circuit de Catalunya, Barcelona in 2004. In comparison the current F1 speed record is 369.9 km / h were scored by Antonio Pizonia with BMW cars, at Monza in 2004.
The decision to opt for limiting engine capacity to 800cc (than with other methods of power restrictions, such as a reduction in the amount of overdrive transmission permitted) according to observers Honda MotoGP highly profitable. Honda uses a five-cylinder engine, and only need to reduce the cylinder to fix their machine to fit the new regulations, while other manufacturers have to redesign their entire machine.
Motor for the MotoGP class allowed to use the machine with the number of cylinders between three to six cylinders, and there are variations in the weight restrictions depending on the number of cylinders used. This is due to an engine with more cylinders, the power generated is also greater, and the weight limit increases. In 2006 the machines used in MotoGP are four and five-cylinder engines. Honda uses a five-cylinder, while Yamaha, Ducati, Kawasaki, and Suzuki uses a four-cylinder.
Motors that are used in motorcycle Grand Prix was made not only to race, but also as an opportunity to showcase the power and technological advancement between manufacturers. As a result the entire MotoGP machines created using very expensive materials and as light as titanium, and carbon-fiber-reinforced plastic. These motors also use technology that is not available for public consumption, for example, is a sophisticated electronic device including telemetry, engine management systems, traction control, brake discs of carbon, and modern engine technology adopted from the F1 car engine technology.
If the motors are used in the MotoGP class only competed at the world championship level, motors that are used in the 125cc and 250cc classes are relatively more affordable. The price of a motorcycle of 125cc or less the same as a car. These motors are often used in motor racing national championships around the world.
One of the key challenges facing the MotoGP riders and engineers MotoGP bike is how to deliver exceptional engine power - more than 240 hp (179 kW), through the point of contact of two tires and the asphalt surface of the circuit with a width of only about a human arm. For comparison F1 car produces more than 950 hp (700 kW) but with four tires, so it has a point of contact with the asphalt surface ten times wider than the MotoGP bikes.
(In the picture above) is a machine YZR-M1 four-cylinder (four-stroke) at the Tokyo Motor Show 2009)
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