torque pull - BMW Luxury Touring Community
 
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post #1 of 3 Old Feb 1st, 2008, 6:31 pm Thread Starter
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torque pull

What doe's torque pull mean or lack of torque pull. Forever learning ,thankyou.
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post #2 of 3 Old Feb 1st, 2008, 7:12 pm
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On motorcycles torque pull usually refers to the affect from reving or de-cellerating the engine. On transverse engine bikes, such as V-twins, there is not much torque reaction, but there is a gyroscopic affect on the bike from the heavy flywheel assembly. When riding some bikes, rapid accelleration/deccelleration can cause the bike to want to lean more or straighten up, depending on which way one is turning.

On longitudinally mounted engines, such as the Gen 1 LT, where the crankshaft is in line with the long axis of the bike, torque reactions on most designs will cause the bike to want to roll right or left from throttle application or let off. Moto-Guzzis used to be pretty bad, BMW boxers noticeable, and something extreme like the Boss Hoss will try to rip the bike out of your hands and lay over on you!

The Gen 1 LT however has been pretty marvelously designed to totally negate torque reaction by using a gear between the rear end of the crankshaft and the clutch/flywheel assembly to cause them to rotate in opposite directions. This very effectively cancels out the reactions, so that you just don't feel any torque affect on the bike when you crank back on the throttle or let it off rapidly. Try that on an older Guzzi. I watched someone sitting on a Boss Hoss once at a big motorcycle show, he racked back on the throttle to hear it rev up, and almost got it layed over on him! Fortuately, the booth operators were probably expecting that and grabbed it quick.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
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post #3 of 3 Old Feb 1st, 2008, 7:54 pm Thread Starter
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Thankyou,dshealey.

The info you gave to me was well understood & well put. Thanks again,rbots
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