Transverse crankshaft mounting
The engine can be mounted in transverse crankshaft position as on Harley-Davidsons, Ducatis and many recent Japanese motorcycles. This transverse position gives the motorcycle a reduced frontal area. The main disadvantage of this configuration is that the rear cylinder and the front cylinder will receive different air-flows making air cooling somewhat problematic especially for the rear cylinder. Cooling problems are somewhat mitigated by having all "four" sides of each cylinder exposed to air flow. This differs from a parallel-twin cylinder engine which has a distinct front, back, and sides, but the inside of each cylinder is not exposed to airflow as the cylinders are typically joined together with a cam chain running up through the block in-between the cylinders.edit]Moto-Guzzis and some Hondas is less common. This orientation is well suited for 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. [9] 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.v twin diesel engine 10 hp engine13 hp engine ,18 hp engine,20 hp engine,22 hp engine,25 hp engine 30 hp engine, 5 kw generator,8 kw generator,10 kw generator,12 kw generator 15 kw diesel generator, 20 kw diesel generator,30 kw diesel generator,50 kw generator.fire pump.
 This air-cooled Ducati Monster 620 has a transverse crankshaft 90° V-twin with one cylinder laying horizontally, and one vertically, so that the rearward, vertical cylinder's air flow is less obstructed by the one in front. |
 Honda's VTR250 is similar, but the engine is not leaning forward, thus each cylinder is about 45° from vertical. The rear cylinder's air flow is blocked, but note this is a water-cooled engine, so what most matters is that the radiator is out in front with good air flow. |
 As the Ducati models get larger engines, they gain oil-, and then water-cooling, as in this Monster S4R S. Like the VTR250, the radiators are out in front, but the basic engine orientation retains the cooling advantages of the Monster 620. |
[ Longitudinal crankshaft mounting
The longitudinal crankshaft two-cylinder V as seen on
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