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Old 03-28-2012, 05:42 PM   #16
danedg
Horizontally Opposed
 
Joined: May 2008
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from wiki

True boxers have each crankpin controlling only one piston/cylinder while 180 engines, which superficially appear very similar, share crankpins.
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Old 03-28-2012, 06:27 PM   #17
supershaft
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Quote:
Originally Posted by danedg View Post
True boxers have each crankpin controlling only one piston/cylinder while 180 engines, which superficially appear very similar, share crankpins.
I would not be surprised if that came right out of Wikiwrongia since that statement is mostly all wrong. A 360 degree crank most often shares the crankpin like a Harley, Duc, or Moto Guzzi. 360 degree cranks can also have two separate crank pins like a Yamaha XS650, Triumph, or Norton or have the two separate crank pins crank pins 90 degrees apart like Yamaha 800cc vertical twins and some of the new Triumph twins for a 270 degree crank. Then there are crank pins 180 degrees apart like a BMW or a RD/RZ. In a vertical twin with a 180 degree crank one piston is going up while the other is going down. In an opposed twin with a 180 degree crank like our beemers both pistons go in at the same time and both go out at the same time hence the name "boxer". The pistons "box" at each other.

supershaft screwed with this post 03-28-2012 at 06:59 PM
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Old 03-28-2012, 06:55 PM   #18
danedg
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