cvt trans

[eldo]

I herd that a cvt trans cuts power down on 4 stroke by 15to 20% percent is this true? There are a lot of cvts out for about $70 are they worth looking into they look good

[stevolandis]

What CVTs are you talking about? The only way I heard to CVT a bike is with a SBP Shifter Kit and NuVinci hub.(total= ~$500) Is this only for 4-strokers? Sorry I can't answer your question, I don't know anything about CVT on bikes...

[john_the_great]

Originally Posted by eldo

I herd that a cvt trans cuts power down on 4 stroke by 15to 20% percent is this true? There are a lot of cvts out for about $70 are they worth looking into they look good

By that you mean take power away? There is some "belt drag" plus the force required to spin the weights on the first pulley so a cvt requires some power to operate, but of course this is not very noticeable. The pocket bike cvt's will work on the titan 4-stroke's and the comet torque-a-verter's I would assume will work on the four strokes as well. The problem with the pocket bike cvt's though is they reverse the direction of the drive sprocket causing mounting issues.

[Dan]

Wow, even 15% would be an incredible power loss. Working on one now and will report. Really hope it is no where near that. At 2.5 HP, that would be significant.

Have not found a CVT for 70 bucks, can you post a link Eldo? Retail, we are paying $170 a pop. But went with high end.

[Dan]

Neat Times, (Ron) is the CVT Guru! I have been following his work for yrs. Some great info on his thread; http://motorbicycling.com/f36/cvt-rack-mount-7265.html A lil while back I had asked him about building with CVTs. He replied that he loved the "smooth" Knowing him, it sold me on the concept.

[john_the_great]

CVT transmission, X7 belt drive transmission, X1, X2, chinese pb parts,

[BarelyAWake]

Sorta off-topic but I thought some might get a kick outa this

"In 1959 DAF started selling the world's first car with a continuously variable transmission, the small four-seater DAF 600";

(img taken frm 'Scrapheap Challenge' season 7, episode 11)

Originally Posted by wiki

DAF cars had the image of being slow. The company tried to change this image with entries in rallies and races, such as their entry in the London-Sydney Marathon. This led to an increase in sales, but not as much as the management had hoped for. The company also competed with a Formula Three car.

* 1993: A Williams Formula One car was not allowed to race, because it had the Van Doorne's CVT drive. If that car had raced, it could have been more than a full second per lap faster than the competition. As Williams was the leading team already at the time, the F1 management decided to forbid the technology. It would have been the first time a technical development introduced in a road car would be used in a race car, instead of the other way round.

DAF Cars and Trucks

[NEAT TIMES]

I Like My Cvt Bikes. I Have One With The Titan 4 Stroke And One With A Cag 52cc Big Bore Kit. There Seems To Be Near Zero Power Loss. They Start Out A Part Throttle With Ease, I Never Pedal Assist And I Weigh 325. A Friend Has A Hf 52cc Water Pump Motor W/cvt And Runs With 40 Mph Traffic. The Only Problem Is The Width For Frame Mounting. They Are In Most Of The New Scooter`s Of Many Engine Cc Sizes. My Brother Has A 400cc Scooter That Is A Rocket. The Belts Last A Long Time, $10. Ea. Ron .

[eldo]

Neat times thanks for info I see john was wright about running opposite way I see yours are rear mounts good for my trikes any particular one better than others ones Ive seen run average about $70 you need 78mm housing and Guess 7to1 reduction would be best.

[NEAT TIMES]

I Think There Is Only One Model Available, Unless You Find A Used One. They Start At 7-1 And Shift Up Smoothly. Ron