Quote:
Originally Posted by rmay635703
An opposing twin that is balanced makes no conter movement or vibration when both OPPOSING cylinders fire as they counteract each others momentum
BMW motorcycles occasionally did this.
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BMWs opposed twins fire 360 deg apart from cyl to cyl., otherwise there would be two simultaneous bangs and then a crank rotation with no power pulse.... just like the 360 deg parallel twins.
http://www.animatedpiston.com/BMW.htm