4 stroke will start to dominate soon. Does sandbomber use a turbo or its just pure horsepower?

 

No Turbo. Turbo bikes go really fast the last half of the track. They lose the race in the first 60 ft though. Sandbomber was running a strong 855cc Rotax with a small to medium shot of Noss.

 

Man that's great to hear!!!!![img]i/expressions/face-icon-small-happy.gif[/img] Ds's kicked A$$ at Dune Fest, Four Stroke Wars, and now , Planet Sand!!!!!! For a Quad that so many diss on , it's won quite a few races in recent...[img]i/expressions/face-icon-small-smile.gif[/img]

 

With some luck and a few more ponies the DS will continue to push the numbers even lower.

 

and no good news about yamaha raptors?lol

 

Unfortunately, the only news I have heard so far is the KMS Raptor went Kaboom. The best 4 stroke showing I heard about from Yamaha was Airforce1 YFZ. Fast bike!

 

do you think the little 450 will dominate all the big bores? or its no competition

 

Airforceone's 480 YFZ was nothing less than spectacular. It was flying. Nmotion done a great job on that motor. [img]i/expressions/face-icon-small-wink.gif[/img]

 

No I dont think the Yfzs will completely blow away the big bores. Yes there lighter, but they just cant make up for lack of displacement. I have heard of some huge cylinder 450rs and Yfz some beyond the 525 cc number. Both classes of bikes have room for improvement but its going to take a very special build on a little bore to take out the big bores. Airforce 1's builder stated that there probably at the max on the amount of nos it can safely take. But hes still got some more cc's to go. This is the fastest YFZ I have seen. Alot of props to its builder.

On the other hand, the big bores still have room to go on the cc's and there not to the max on the nos.

Just a number to think about aswell. Airforce 1's bike was around 220lbs and the Big DS were around 270lbs. The pilot of the Yzf was 80lbs and the pilots of all three big DS were all over 150lbs.

 

Excellent analysis 1Big![img]i/expressions/face-icon-small-smile.gif[/img] I think you are spot on. They can't make a YFZ light enough to overcome the hp advantage a rotax can make.

I am not convinced the 450 will like being more oversquare. There is a point of diminishing returns on increasing bore alone. I think there is a reason the fastest 450 on the planet is a 480, not a 550.