OK, someday I plan on getting a 720 kit or get mine bored to a 680. I would get cams for strong midrange to somewhat top end, possibly???? Well what I would like to know what would be the power/torque difference between the 720 and 680 with the same cams and same kind of port work??? I would like to know if I did either of these kits, of course I would have better cams but would the porting be needed or would I be waisting my time if I DIDN'T do porting? In other words does porting help a lot with either kits?? Remember I would like to know power differences between the 720 and 680 but with same cams and porting. Ya like I said, It's a dumb question but I haven't ever SEEN a DS with motor work or anything. Thanks in advance.

 

I don't know the actual answer. But my guess would be the 720. All things being equal except the combustion chamber in the 720 can take in more air and fuel. So the 720 would have a slight bit more power I would say.

 

Check with dsmike

 

I obviously figured the 720 would be faster but I would like to know the difference in power between that and the 680. Who knows I'm sure someone out their has a 680 tuned to go faster than a 720 I just want to know what the gap in power is. And for the price, wouldn't I just be waisting my money if I didn't just get the 720 right a way or..........

 

Thats differant. Power / torque I stick with my first guess. Now if ya want to know faster. It all depends on rider. Because my guess is that a 680 and 720 are pretty close. But like i said, Im just guessing.

 

There is a theory on this that says if you have a 650cc motor breathing through a given size port and you take that same head and use it on a larger (i.e: 760cc) motor then obviously it's easier to pull 650ccs of air through it than 760ccs. So you get diminishing returns from engine size unless you make the ports larger. Now if you make them larger and you still only have to move 650ccs then it becomes even easier to make power. Same principal for cams to, a cam in a 650cc engine will have to stay open longer and higher to move the extra air (760) in the same amount of time.

I guess it's like sucking through a straw, little engine needs a little straw. Big engine... big straw. Little engine/ big straw=[img]i/expressions/face-icon-small-smile.gif[/img]

 

So is it bigger the better?? I know there is a point between big and pure hogged out.

 

I talked to Gary at TVI and with in the next 10 days he will release his 718 kit.. It will retail around 700-800.

 

wat all comes with this kit?