I was told that the kawa 700 prairie has 47 stock HP and the polaris 700efi parallel twin has 51 HP. I thought that the prairie had the most HP and torque of any 700????[img]i/expressions/face-icon-small-confused.gif[/img] Also, I thought the v-twin was a better design than the even-firing paralle twin???? Then I was told the new BF has 51 HP and the new polaris 800efi has 53 or 54 HP. Is this true????? Please help me understand this. I was under the understanding that the kawa 700vtwin was the best design and produced the most HP and torque, but now I am told that the polaris puts out more HP......HOW CAN THIS BE?????[img]i/expressions/face-icon-small-confused.gif[/img] Thanks for any help.

 

I think the drag race results speak for themselves, don't you?

 

The power from the V can not be matched....BUT the reason why the hp numbers are lower then the polaris is probably because the machines are detuned from the factory...but the polaris is just a little less detuned....that is just my thoughts ne ways

 

The EFI means a lot. If the brute force had EFI, it probably would have more HP. Another major thing to consider is the HP to weight ratio. The Polaris is a lot heavier, and it takes more power to move it.

 

I wont beleive the Polaris numbers till I see them myself, right off a crank dyno.

I now that a p650 has 2 more horses to the ground than a sp700.

I think that you will find the HP numbers to be wrong or atleast the Kawis put more HP to the ground.

As far as EFI goes I was talking to a friend(runs a promod Suzuki 1500 with nitrious) and he said that a well tuned CARB will beat EFI everytime. [img]i/expressions/face-icon-small-happy.gif[/img]

 

Thanks for the info. I guess what doesn't make sence to me is a 697cc v-twin motor not producing more hp than a 683cc even-firing parallel twin. But, I have heard that the kawa v-twin is extremely detuned and the polaris is not detuned at all, but I don't know that for sure. When I consider the v-twin, I was told that on any given up stroke that at least one cylinder is firing while the other is in the exhust stroke. On the next revolution, they swap, thus producing an even power and torque band. When I consider the even-firing parallel twin, I was told that on one stroke, both cylinders fire and then on the next stroke, they exhust, thus not producing an even power or torque band. To me, an even-firing parallel twin motor defeats having a twin at all. Why not have them alternating like the v-twin? That way, the power and torque bands would be smoother and you would get better performance from the motor. I could be totally wrong on all of this, thus is why I started this thread........to educate me on this matter. Again, thanks for the information.

 

The pistons in the Polaris twins move up and down together, but fire opposite each other. When one piston is on the power stroke the other piston is on the intake stroke.

 

That's right

 

The V is simply a better design. Hardly anybody making a parallel twin anymore, except for the polaris engine

 

v-twins make more torque and more power over a broader rpm range than parallels. Look at the sport bike world. The inlines like the Yamaha R's, Honda CBRs, Kawi ZX's make INSANE hp numbers, but they are way up in the RPM range. The V twins like the Honda RC-51, Aprilia Mille series, Suzuki TLRs, make killer torque and very good HP at a much lower RPM. The V's have a much more broad and useable powerband IMHO, and a much nicer sound!!!!!

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