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Old 04-02-2017, 12:54 PM   #11 (permalink)
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But this is not just a cogged belt drive. It is a v belt in a cvt which is much less efficient than a chain.

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Old 04-02-2017, 01:35 PM   #12 (permalink)
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Yes but you see the constant RPM of the motor and easy power are on the other end of the of the scale
also that is a cogged drive belt in a cvt
but it's not a synchronous belt drive
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Old 04-02-2017, 09:34 PM   #13 (permalink)
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There are lots of losses in a rubber scooter cvt. Lots of heat. Requires it's own fan. Nothing cogged about it. The v belt is gripped by pressure from the contra spring and weights on the surfaces of it's sides.
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Old 04-03-2017, 12:00 AM   #14 (permalink)
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It is a cogged belt Google one look at the picture
And it is only griped on one side both the contra spring and the variator float on the belt and provide no traction
like a fat kid sitting on a cape

The belt you are talking about is a synchronous belt
A cogged belt is a v belt with notches or cogs to allow more flexibility and less heat

http://www.jpcycles.com/product/603-...5xgaAsvY8P8HAQ
https://www.vbeltguys.com/products/a...wsQaAkKR8P8HAQ

Last edited by ASV; 04-03-2017 at 12:38 AM..
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Old 04-03-2017, 07:22 AM   #15 (permalink)
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Whatever. The cuts in the belt of a scooter cvt don't engage anything. They are only there to help reduce the bending losses as it goes around the pulley. The only transfer of power come from the pulley halves squeezing the sides of the belt. There are compression losses in the rubber and a certain percentage of slipping.
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Old 04-03-2017, 02:30 PM   #16 (permalink)
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That's true but there are things that can be done
The cooler you keep the belt in the first place the less
heat it produces. It slips very little if clean and the contra cams spring and veriator face are in good shape

Chain on the other hand has vibration problems
also has slipping even if it's moved of to the clutch
and does not self adjust for stretch
Also has compression loses to the rubber bumpers in the wheel
It will last only about as long as I can get one of my belts to
Belt start at about $5 and a good quality belt is about $35
A cheap chain for a little bike starts at about $20 if you want a good one
Well... It's not uncommon to spend $150
And it heavy
Pros and cons on either drive

Last edited by ASV; 04-03-2017 at 02:43 PM..
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Old 05-05-2017, 09:26 AM   #17 (permalink)
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FE wise i owned a honda xr 125 (geared bike) and now own a Chinese gy6 125 scooter and getting the same mileage. Around 90mpg. Scooter is definitely more nippy through traffic but on tje open road the honda was about 15mph faster. That being said i did own a 150cc gy6 that's consumption was about 50 to 60mpg
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Old 05-05-2017, 05:03 PM   #18 (permalink)
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50 to 60 mpg is a very poor number for a 150 gy6 something is wrong with it. The worst I ever got with a 150 was 75 and that was in an over sized frame zipping around at 55 mph

My current gy6 150 scooter is doing 120 mpg on average and and up to 70mph of course I don't get the same benefits at that speed as I do at 45
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Old 10-06-2017, 02:03 AM   #19 (permalink)
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Quote:
Originally Posted by minimac View Post
I'm thinking a manually operated solenoid instead of a lever to facilitate changes. I think something like this could help anyone doing a foot forward design.
Why not a hand-shifter similar to the one which was used in the early Vespa?


Quote:
Originally Posted by Eddie25 View Post
FE wise i owned a honda xr 125 (geared bike) and now own a Chinese gy6 125 scooter and getting the same mileage. Around 90mpg. Scooter is definitely more nippy through traffic but on tje open road the honda was about 15mph faster.
Scooters seem to not just get a narrower RPM band, but also not to compensate it with a wider gear spread which would render them more suitable to occasional road commuting.
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Old 10-14-2017, 04:42 PM   #20 (permalink)
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Dipping into one of my text books, Mechanical Engineering Design 5th Ed. Shigley and Mischke, we find V belt efficiency ranges from 70 to 96%. A notched V belt is different from timing belt system which rivals a roller chain with efficiency of 97-99%.


Last edited by Grant-53; 10-14-2017 at 04:48 PM..
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