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What advantage in a parallel twin cylinder motor does a 180 degree crank have over a 360 degree one?
Wiki User
∙ 11y ago
It offers better mechanical balance.
In a 360 degree twin both pistons rise and fall together so both conrods travel up and around the crankshaft together. In doing so the bottom 'big end' bearing describes a circle. before it reaches the top or the bottom it is thrown to the front or back. At speed, this action of the paired conrods creates a significant amount of stress which not only limits engine speed but causes extreme levels of vibration which limit the engine's speed.
A 180 on the other hand has one piston rising while the other falls so the actions of each conrod arelargelycancelled as one is always doing the opposite of the other. This allows for significantly less stress as well as less vibration and therefore allows the engine to rev higher.
One fairly modern example of this can be found in the Honda 125 Twin engines. The Sporting CB125 had a 180 degree crank and revved safely to 12000 rpm, the Rebel and CD 125 versions had a 360 degree crank and revved to around 8000 rpm max.
High revs mean more power so higher revving 180 degree engines can create more horsepower. However, 360 degree engines have more regular power pulses and 'feel' better. A 360 degree engine with well engineered balancer shafts is a very pleasant power unit to experience on a motorcycle!
Wiki User
∙ 11y ago
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