Ask MO Anything: Transverse or Longitudinal V-Twin? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 2 (permalink) Old 04-12-2017, 01:10 PM Thread Starter
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Join Date: Jan 2014
Posts: 60
Ask MO Anything: Transverse or Longitudinal V-Twin?



Quote:
Dear MOby,

Excuse the noob question, but what’s the difference between a transverse V-Twin and a longitudinal one, and what are the advantages of each?

Navigational Ade


Dear Ade,

It has to do with the orientation of the crankshaft. Any engine, be it a V-Twin, V-Four, or inline-Four, is considered to be “transverse” if its crankshaft lies perpendicular to the motorcycle’s wheels, i.e. across the frame, parallel to the axles. Most motorcycles have transversely mounted cranks, including all Harley-Davidson V-Twins, nearly all four-cylinder sportbikes like the Yamaha R1, Kawasaki ZX-10R, Aprilia RSV4, all Ducati V-Twins and V-Fours… including the Monster 797 pictured on the left, above.

Chain or belt drive to the bike’s rear wheel is simplest and lightest with this layout, and having the crankshaft spinning in the same plane as the rear wheel means power can be transferred through the gearbox and straight on into the drive chain and rear sprocket without making any power-sucking changes of direction.
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post #2 of 2 (permalink) Old 04-13-2017, 07:48 PM
KCW
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Join Date: Sep 2016
Posts: 349
Another aspect is a traverse engine spins the flywheel in the same plane as the wheels, either adding to or subtracting from the gyroscopic effect of the wheels/tires. This will make the bike feel more stable or more nimble, depending on which way the flywheel spins.

A longitudinal engine puts the flywheel 90° to the bikes wheels. When you turn the bike in one direction it will tend to lift the nose. When you turn the other way it tends to push the nose down. Its not overpowering, but if you understand it you can feel it. Some people find it annoying.

also with a longitudinal engine when you get on the throttle, or compression brake, the torque leans on the bike left and right, instead of front and back.

Last edited by KCW; 04-14-2017 at 08:39 AM.
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