Join Date: Jan 2007
Location: Palmer Lake, Colorado
Here's food for thought...
I have not ridden a Wee, but my Vee has a coarse feel to it below 4000-4500 rpm on the whole. Any Vee owner knows that. Go above that range and it smooths out a lot.
What is the rpm that most folks spend their time at on a Wee (I am cuious the RPM at 75 mph on a stock geared bike)? We all accelerate and the smaller engine should feel smoother because of the much smaller power pulses. Once up to a given speed, the Wee runs at a higher rpm relative to the Vee, and probably by a good margin. By comparison it is at the higher engine speeds that the Vee smooths out IMO.
I'm guessing the smoothnes of the Wee is a combination of smaller reciprocating mass, running at higher cruise rpm where V twins tend to smooth out, and that something extra you get sometimes when all the aspects of a good design (Wee engine) come together to create the whole.
The Vee consists of two 500cc jugs, have you ridden a 500cc thumper lately? I rode my neighbors 1982 Yamaha XT 550 the other day and it's no better than my other friends 1 year old Honda XR650. NOT smooth. Large piston. I've been on smaller 250cc single cylinder bikes as well and they are much smoother. Technically the cylinders should cancel each other out, but they still are bigger pistons going up and down with much greater force, doing much more work.
Sorry to take up so much space in the thread. In my opinion it is all of the above that are coming together to make the differences.
LONG LIVE THE VEE and it's TORQUE CURVE!