Search results
Results from the WOW.Com Content Network
Motorsport engines often run on high-octane petrol and can therefore use higher compression ratios. For example, motorcycle racing engines can use compression ratios as high as 14.7:1, and it is common to find motorcycles with compression ratios above 12.0:1 designed for 95 or higher octane fuel.
With power typically being the product of force and speed, a motorcycle's power and torque ratings will be highly indicative of its performance. Reported numbers for power and torque may however vary from one source to another due to inconsistencies in how testing equipment is calibrated, the method of using that equipment, the conditions during the test, and particularly the location that ...
In a typical CVT, the gear ratio will be chosen so the engine can reach and maintain its maximum-power speed as soon as possible (or at least, when at full throttle, in a partially load-dependent system), but in a semi-auto, the rider is responsible for this choice, and they can ride around all day in top gear (or first) if they so prefer.
[10] [14] To increase the smaller engine's power, the K75's engine was given longer valve timing, [10] the compression ratio was increased to 11.0:1 from the K100's 10.2:1, [10] [15] the combustion chambers were redesigned, the intake manifold was shortened, and the exhaust system was retuned. [15]
A typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and a mass of 380 kg (840 lb), [1] giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb). Examples of high power-to-weight ratios can often be found in turbines. This is because of their ability to operate at very high speeds.
At the time of its release Ducati claimed that the 1199 Panigale was the world's most powerful production twin-cylinder engine motorcycle, with 195 bhp (145 kW) at 10,750 rpm, and 133.0 N⋅m (98.1 lb⋅ft) torque at 9000 rpm on an engine test stand. [5] With a claimed dry weight of 164 kg (362 lb) and a curb weight of 188 kg (414 lb). [6]
In developing countries where typical motorcycles are 125–150 cc (7.6–9.2 cu in) displacement, the larger 249.5 cc (15.23 cu in) CBR250R is at the higher end of the sport bike range, [10] looking similar to much more powerful sporting machines with its full fairing in Honda's new layered style that was introduced on the 2008 CBR1000RR Fireblade and 2010 VFR1200F.
In this case, shifting up to 3rd gear causes the engine speed to be slightly below the speed at which maximum torque is produced. By using a close-ratio gearbox, such as the Hill Climb example above, shifting to 3rd gear would drop engine speed to 5120/min (6600 × 1.55 / 2.00), which almost coincides with the maximum torque output of the engine.