M
mppardee
Guest
I searched this forum and read every post containing cvt and saw a few people mentioning using a CVT transmission but they don't seem very popular for motored bikes. Can anyone using a CVT comment on its effectiveness?
For those that are unfamiliar with a CVT, it is a simple transmission, usually automatic, that gives you a higher gear ratio when you are starting out. It would give a motored bike a feel more like an automatic transmission car instead of a car that only has 3rd gear.
It seems that most motored bike setups without any "transmission" are severely limited in either hill climbing or flat speed. I'm assuming a power band of a 4-stroke 35CC engine is 5000-8000 rpms, which means if I want a top speed of 30 mph I won't get good power until 18.75 MPH which is a lot of pedaling to get going up big hills.
There are some cheap ~$50 CVT transmissions available for pocket bikes:
http://www.scooterparts4less.com/web_gas/x1_Pocketbike_cvt_transmission.htm
http://www.partsforscooters.com/CVT...e3eTaxaQbxmTe34Pa38Ta38Oahb0?sc=9&category=60
http://www.scooterparts4less.com/web_gas/x2_Pocketbike_gearbox.htm
Maybe you could get a CVT or other transmission from a moped too, but I had trouble finding moped transmission parts. I think you would need a CVT designed for a 4-stroke engine since the 2-strokes are higher RPM. I can't find any specs on these cheap CVTs gear ratios, etc.
It seems like you could get a real performance boost by adding one of these but GEBE and staton and the other major kit makers don't use them. Does anyone have experience with a CVT and advice for using or not using one?
Staton offers the nuvinci 350% internal hub but I'd rather not spend $400 on a hub that probably has no warranty for use in a motored application and might wear out quickly. A basic CVT might be "good enough" and would also be automatic. According to some laws when a bike engine has manual shifting it is no longer a moped, so an engine tied into the nuvinci hub might technically make it a motorcycle.
For those that are unfamiliar with a CVT, it is a simple transmission, usually automatic, that gives you a higher gear ratio when you are starting out. It would give a motored bike a feel more like an automatic transmission car instead of a car that only has 3rd gear.
It seems that most motored bike setups without any "transmission" are severely limited in either hill climbing or flat speed. I'm assuming a power band of a 4-stroke 35CC engine is 5000-8000 rpms, which means if I want a top speed of 30 mph I won't get good power until 18.75 MPH which is a lot of pedaling to get going up big hills.
There are some cheap ~$50 CVT transmissions available for pocket bikes:
http://www.scooterparts4less.com/web_gas/x1_Pocketbike_cvt_transmission.htm
http://www.partsforscooters.com/CVT...e3eTaxaQbxmTe34Pa38Ta38Oahb0?sc=9&category=60
http://www.scooterparts4less.com/web_gas/x2_Pocketbike_gearbox.htm
Maybe you could get a CVT or other transmission from a moped too, but I had trouble finding moped transmission parts. I think you would need a CVT designed for a 4-stroke engine since the 2-strokes are higher RPM. I can't find any specs on these cheap CVTs gear ratios, etc.
It seems like you could get a real performance boost by adding one of these but GEBE and staton and the other major kit makers don't use them. Does anyone have experience with a CVT and advice for using or not using one?
Staton offers the nuvinci 350% internal hub but I'd rather not spend $400 on a hub that probably has no warranty for use in a motored application and might wear out quickly. A basic CVT might be "good enough" and would also be automatic. According to some laws when a bike engine has manual shifting it is no longer a moped, so an engine tied into the nuvinci hub might technically make it a motorcycle.