V-twin engines are two-cylinder engines the place the cylinders share a standard crankshaft however will not be parallel with one another. They’re organized in a V configuration, with separate cylinder heads as a substitute. Most producers elect to mount them transversely — this structure has the crankshaft journey throughout the motorbike, permitting the cylinders to be in step with the physique, i.e., longitudinally. This enables the motorbike to be narrower and for the torque generated throughout acceleration to be distributed alongside the size of the motorbike. Nevertheless, the rear cylinder receives poorer airflow and is thus susceptible to getting very popular.
Then again, longitudinally-mounted V-twins usually have higher cooling. It’s because the cylinders can protrude outwards on both aspect of the motorbike and thus obtain higher airflow. One other profit is that it may be simpler to implement for shaft-driven bikes (the place the rear wheel is linked to the transmission by way of a driveshaft slightly than a belt or chain) because the crankshaft travels alongside the physique of the bike as a substitute of throughout it. One main downside of this structure is that torque underneath acceleration may cause the motorbike to twist in a single course.
The angle between the 2 cylinders can fluctuate from producer to producer, usually between 40 and 90 levels. 90-degree V-twins are also called L-twin engines as a result of the cylinders type an L slightly than a V. They’re comparatively unusual and customarily reserved for racing implementations, like in among the greatest Ducati bikes.