that is 10in wheels tunes roller about 42-45 grams- 110lb rider.Dont buy 9:8gear , just 9:1 gear are good on steep hill and flat road!
What is stock rear gearing in 01 elite? 9.8:1
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9:1 gear goes little over 70mph, dd50 not port motor/ not port contesta bore,pg long, keli pulley/ramp. ct/28mm oko and pg long &1500 springs ... near sea level tuning that is 10in wheels tunes roller about 42-45 grams- 110lb rider.
Dont buy 9:8gear , just 9:1 gear are good on steep hill and flat road!
that is 10in wheels tunes roller about 42-45 grams- 110lb rider.Dont buy 9:8gear , just 9:1 gear are good on steep hill and flat road!
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Wheelman-111
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Clutch Drive Ratio?
Greetings:
The clutch is splined onto the front transmission shaft. There is no "clutch drive ratio". My NB50 Service Manual indicates the Variator can vary the engine/front shaft ratio by a factor of 2.4:1 at its low-speed position to 0.8:1 at its high-speed position.
That and the gearing determine a relationship between engine RPM and rear axle RPM. The relationship is fixed once the variator sheaves are fully compressed.
RPM(e)/0.8 = RPM(d) Where "e" and "d" refer to Engine and front Drive shaft.
After that it becomes a question of determining the speed of the Axle:
RPM(d)/9(for 9:1 gears) = RPM(a) Plug in 12.4 or 7.833 or whatever your gearing is.
The Axle speed is multiplied by about 50 inches per revolution, based on a 16" wheel-tire diameter.
So once you know axle RPM, you can determine theoretical groundspeed per minute in any units you like.
I performed the calculations of my previous post in my head, so there are probably errors, but the gist is that it would take lower gearing or a phenomenally high-revving engine to get to 70, let alone 100. Factor in imperfect belt contact, tire slippage and the inherently bad aerodynamics of any open * vehicle and it seems unlikely that an air-cooled scooter can run at the Ton for long, except in the vivid imaginations of their owners. See Power, Traction, and Aerodynamics.
The clutch is splined onto the front transmission shaft. There is no "clutch drive ratio". My NB50 Service Manual indicates the Variator can vary the engine/front shaft ratio by a factor of 2.4:1 at its low-speed position to 0.8:1 at its high-speed position.
That and the gearing determine a relationship between engine RPM and rear axle RPM. The relationship is fixed once the variator sheaves are fully compressed.
RPM(e)/0.8 = RPM(d) Where "e" and "d" refer to Engine and front Drive shaft.
After that it becomes a question of determining the speed of the Axle:
RPM(d)/9(for 9:1 gears) = RPM(a) Plug in 12.4 or 7.833 or whatever your gearing is.
The Axle speed is multiplied by about 50 inches per revolution, based on a 16" wheel-tire diameter.
So once you know axle RPM, you can determine theoretical groundspeed per minute in any units you like.
I performed the calculations of my previous post in my head, so there are probably errors, but the gist is that it would take lower gearing or a phenomenally high-revving engine to get to 70, let alone 100. Factor in imperfect belt contact, tire slippage and the inherently bad aerodynamics of any open * vehicle and it seems unlikely that an air-cooled scooter can run at the Ton for long, except in the vivid imaginations of their owners. See Power, Traction, and Aerodynamics.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
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steffen707
- Elite
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- Location: Central, WI
Re: Clutch Drive Ratio?
so really its rpmE/.8/.9=rpmAWheelman-111 wrote:Greetings:
RPM(e)/0.8 = RPM(d) Where "e" and "d" refer to Engine and front Drive shaft.
After that it becomes a question of determining the speed of the Axle:
RPM(d)/9(for 9:1 gears) = RPM(a) Plug in 12.4 or 7.833 or whatever your gearing is..
What i'm confused about is this, the manual says the front shaft ratio factor is between 2.4 and .8, isn't that the ratio of the front pulley to the rear pulley.
At low speed the belt is riding on the inside of the variator (small diameter) and riding high up on the clutch side pulley (large diameter).
At higher engine speed the rollers move away from the center of the variator causing them to push against the variator backing plate, pushing the variator forward causing the belt to ride up high on the front pulley (large diameter) and at the same time, the spring in the back is compressed causing the clutch side pulley to move out allowing the belt to ride low on that pulley (small diameter).
So the 2.4 would be small diameter front, large diameter rear, and .8 would be large diameter front and small diameter rear?
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steffen707
- Elite
- Posts: 916
- Joined: Wed Aug 13, 2008 12:41 am
- Location: Central, WI
Nevermind, found it here.
http://auto.howstuffworks.com/cvt2.htm
The drive ratio is the ratio of the drive pitch radius to the driven pitch radius.
http://auto.howstuffworks.com/cvt2.htm
The drive ratio is the ratio of the drive pitch radius to the driven pitch radius.