Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle Mechanical Components > Hubs, Gearboxes, Sprockets and Chains

Hubs, Gearboxes, Sprockets and Chains Can't find 'em, grind em - hubs and transmissions, problems and modifications to make you run smooth and trouble free


46CC for 60 MPH

Can't find 'em, grind em - hubs and transmissions, problems and modifications to make you run smooth and trouble free


Reply
 
Thread Tools Display Modes
  #1  
Old 10-20-2012, 01:57 AM
bowljoman bowljoman is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Wa
Posts: 294
Thanks: 0
Thanked 2 Times in 2 Posts
Default 46CC for 60 MPH

Im goina do it! I know its possible with my ride. Currently I can get 40+mph @7500RPM with 1.5 HP. This new engine Im building the mount for gets 4.2 HP at 11000 RPM stock.
GPR46 + iMotion3 + 12.5 inch rear wheel.
Reply With Quote
  #2  
Old 10-20-2012, 08:53 AM
JonnyR JonnyR is offline
Motorized Bicycle Elite Member
 
Join Date: May 2012
Location: ronkonkoma, new york
Posts: 1,203
Thanks: 0
Thanked 4 Times in 4 Posts
Default Re: 46CC for 60 MPH

im interested in this idea and want to see how you do it and how it turns out

i wish to subscribe to your newsletter or magazine
__________________
Are you callin' me crazy! just cuz i got a hotel in my foot doesn't make me a boogali moogali moogali

Schwinn jaguar with a 66cc flying horse
they all run fantastic till they don't

smoke tires not drugs
YES! YES! JESUS H. TAP-DANCING CHRIST... I HAVE SEEN THE LIGHT!
http://www.youtube.com/watch?v=YoPVC4YxDlI
http://www.youtube.com/watch?v=y0O7_...eature=related
Reply With Quote
  #3  
Old 10-20-2012, 09:40 PM
elemein elemein is offline
Motorized Bicycle Member
 
Join Date: Jan 2012
Location: Canada
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: 46CC for 60 MPH

Hrmmm let's see...

7500 * TQ / 5252 = 1.5 HP solved, is, 1.05 lb-ft of torque. <(Old engine values)
11000 * TQ / 5252 = 4.2 HP solved, is, 2.00 lb-ft of torque. <(New engine values)

Your new engine is 190% stronger than your old engine... Is 2.00 lb-ft of torque enough for 60 MPH?

Not to be a killjoy, but aerodynamic drag increases exponentially; so while you may be able to get 40 MPH now with 1.05 lb-ft of torque; double the force does not mean double the speed.

Though let me know how it goes! I'd love to see it happen!
Reply With Quote
  #4  
Old 10-20-2012, 10:25 PM
JonnyR JonnyR is offline
Motorized Bicycle Elite Member
 
Join Date: May 2012
Location: ronkonkoma, new york
Posts: 1,203
Thanks: 0
Thanked 4 Times in 4 Posts
Default Re: 46CC for 60 MPH

some stock 49cc engines are able to do 40MPH the thing i want to see if how much more he can get out of the stock engine to drive a 48T or 44T rear sprocket effectively then 50MPH is a possibility
__________________
Are you callin' me crazy! just cuz i got a hotel in my foot doesn't make me a boogali moogali moogali

Schwinn jaguar with a 66cc flying horse
they all run fantastic till they don't

smoke tires not drugs
YES! YES! JESUS H. TAP-DANCING CHRIST... I HAVE SEEN THE LIGHT!
http://www.youtube.com/watch?v=YoPVC4YxDlI
http://www.youtube.com/watch?v=y0O7_...eature=related
Reply With Quote
  #5  
Old 10-21-2012, 03:37 AM
bowljoman bowljoman is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Wa
Posts: 294
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: 46CC for 60 MPH

It would not be fun if it was Easy.

A goped scooter can hit 50-60 MPH without a transmission using a expansion chamber and porting. Add in the three speed and we'll see what i can get.

THe old scooter motor without the tranny was 25 MPH at peak HP, way under 8000 RPM.

Here is the new motor.

Reply With Quote
  #6  
Old 10-21-2012, 10:18 AM
JonnyR JonnyR is offline
Motorized Bicycle Elite Member
 
Join Date: May 2012
Location: ronkonkoma, new york
Posts: 1,203
Thanks: 0
Thanked 4 Times in 4 Posts
Default Re: 46CC for 60 MPH

is that a actual set of numbers or a projected set?
__________________
Are you callin' me crazy! just cuz i got a hotel in my foot doesn't make me a boogali moogali moogali

Schwinn jaguar with a 66cc flying horse
they all run fantastic till they don't

smoke tires not drugs
YES! YES! JESUS H. TAP-DANCING CHRIST... I HAVE SEEN THE LIGHT!
http://www.youtube.com/watch?v=YoPVC4YxDlI
http://www.youtube.com/watch?v=y0O7_...eature=related
Reply With Quote
  #7  
Old 10-21-2012, 10:40 AM
bowljoman bowljoman is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Wa
Posts: 294
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: 46CC for 60 MPH

That is factory numbers for stock motor from chung yang website.
Reply With Quote
  #8  
Old 10-21-2012, 01:16 PM
JonnyR JonnyR is offline
Motorized Bicycle Elite Member
 
Join Date: May 2012
Location: ronkonkoma, new york
Posts: 1,203
Thanks: 0
Thanked 4 Times in 4 Posts
Default Re: 46CC for 60 MPH

elemans calculations are flawed then because the stock engine has 2.31 foot lbs of torque that was what was screwing me up so what kind of torque is projected because thats the important # to me thats the force it exerts to do work as the old racer saying goes
"horse power is for show torque is for go"
__________________
Are you callin' me crazy! just cuz i got a hotel in my foot doesn't make me a boogali moogali moogali

Schwinn jaguar with a 66cc flying horse
they all run fantastic till they don't

smoke tires not drugs
YES! YES! JESUS H. TAP-DANCING CHRIST... I HAVE SEEN THE LIGHT!
http://www.youtube.com/watch?v=YoPVC4YxDlI
http://www.youtube.com/watch?v=y0O7_...eature=related
Reply With Quote
  #9  
Old 10-21-2012, 01:29 PM
bowljoman bowljoman is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Wa
Posts: 294
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: 46CC for 60 MPH

A couple more stats for the gear-heads out there.

For the GPR460 I will be using this.
  • Rear sprocket = 20 tooth ( california excess BMX)
  • Rear Wheel = 12.5" Diameter (Typical electric scooter rim)
  • IGH 3-speed = 24tooth input/20 tooth output
  • Engine sprocket = 12 tooth
  • Crankshaft to Output-shaft ratio = 5 to 1

The setup I used with the old engine only differs in the IGH input sprocket, which is 21-tooth.

The gear calculator I use computes the 3-speed jack shaft and plots the potential speed of the combination based on RPM input values.
  1. 'max torque RPM' = shift point
  2. Clutch stall = lowest RPM of usable power
  3. Max HP RPM = the final reliable maximum RPM you achieve
  4. Max RPM with tail wind = perfect conditions RPM with a tail wind

Set all your values and then hit the start button. It is written in Flash so it will animate the power lines.

http://thebitstream.com/transcomp/
Reply With Quote
  #10  
Old 10-21-2012, 01:32 PM
bowljoman bowljoman is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Wa
Posts: 294
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: 46CC for 60 MPH

Quote:
Originally Posted by JonnyR View Post
elemans calculations are flawed then because the stock engine has 2.31 foot lbs of torque that was what was screwing me up so what kind of torque is projected because thats the important # to me thats the force it exerts to do work as the old racer saying goes
"horse power is for show torque is for go"
If you go to this page http://thebitstream.com/transcomp/ and hit the start button, you will see my 'real world' data as collected over numerous runs. The current values the calculator are set to match real world data, so you might be able to figure it there. All told, Me and the scooter are probably 200 lbs when the data was collected.(safety pads, tools, etc
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:06 AM.


Sponsors

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
MotorBicycling.com