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Hilton 03-05-2018 06:40 AM

Basics of Bike conversion
 
I am searching for different motorcycle conversion tutorials. Our requirement is to obtain a speed of 150 km/hour. Two the point which I got so far:
  1. Size and weight of battery should be appropriate
  2. Type of Motor influences the speed
What are some extra points I should know about it before proceeding?

[Sorry, I made a typo mistake used the bike instead please forgive and missed k instead I wrote mph instead of kmph. Now replaced both. Thanks and sorry]

Stubby79 03-05-2018 12:27 PM

Bike? As in bicycle or motorcycle?

150mph...is that the correct unit?

Frank Lee 03-05-2018 01:23 PM

150 mph bike... I'd suggest V-Max; that torque is a BLAST!

150 mph bicycle... go with rocket power.

Grant-53 03-06-2018 12:33 AM

First determine CdA drag. Second find where you can ride safely ride a motorcycle at 150 mph.

elhigh 03-07-2018 10:13 AM

Hey, OP

Pretty obviously you had something else on your mind when you specified "150 mph motor." You can do 150 mph on a bicycle, but you have to be drafting the Pepsi Challenger dragster to do it. You can do 150 mph on a motorcycle, but you probably won't be able to fit the kind of motor it requires onto a bicycle frame.

So please update this thread with what you actually meant when you said "150 mph."

elhigh 03-07-2018 10:14 AM

Quote:

Originally Posted by Frank Lee (Post 562816)
150 mph bike... I'd suggest V-Max; that torque is a BLAST!

150 mph bicycle... go with rocket power.

Or a valveless pulse jet, if in addition to 150 mph you'd enjoy 150 dB.

samwichse 03-07-2018 12:22 PM

Quote:

Originally Posted by elhigh (Post 562965)
Hey, OP

Pretty obviously you had something else on your mind when you specified "150 mph motor." You can do 150 mph on a bicycle, but you have to be drafting the Pepsi Challenger dragster to do it. You can do 150 mph on a motorcycle, but you probably won't be able to fit the kind of motor it requires onto a bicycle frame.

So please update this thread with what you actually meant when you said "150 mph."

Haha, you think he's coming back!

Look at his post history.

Hilton 03-07-2018 12:37 PM

Sorry it was a blunder from my side
 
Quote:

Originally Posted by elhigh (Post 562965)
Hey, OP
You can do 150 mph on a motorcycle, but you probably won't be able to fit the kind of motor it requires onto a bicycle frame.

So please update this thread with what you actually meant when you said "150 mph."

Very sorry I made a mistake it is a motorcycle. I made a typo. Have updated the thread.

UFO 03-07-2018 12:50 PM

Aha, better. 150kph is more reasonable :)

Hilton 03-07-2018 01:03 PM

Moto
 
Quote:

Originally Posted by UFO (Post 562976)
Aha, better. 150kph is more reasonable :)

So what motor you recommend?

freebeard 03-07-2018 07:02 PM

It was like watching a game of telephone. It was good to see the mid-course correction.
Quote:

What are some extra points I should know about it before proceeding?
Define the use case: on/off road, open/enclosed, carrying capacity, &etc. These will skew you choices.

Then do a lot of homework. Would 20hp get 90mph?

http://ecomodder.com/forum/showthrea...tor-35003.html

The 1947 Volkhart-Saggitta had 25hp and went 90mph. It is/was a four-passenger car with a Cd of 0.17. So there's you benchmark.

Grant-53 03-07-2018 09:13 PM

See www.schultzengineering.us

freebeard 03-07-2018 09:40 PM

There are plenty of ideas on Ecomodder itself.

214 mpg with DIY aerodynamic fairings on a Honda 125cc motorbike

http://ecomodder.com/blog/wp-content...treamliner.jpg

Stubby79 03-08-2018 01:07 AM

~33kw needed to maintain 150km/hr. 50kw will get you there in ~25 seconds.

Based on the numbers I put in. Could be considerably worse or considerably better, depending on weight and aerodynamics.

Hilton 03-10-2018 04:31 AM

Thanks
 
Quote:

Originally Posted by Stubby79 (Post 563054)
~33kw needed to maintain 150km/hr.

Thanks, Is there any formula for this calculation?

Hilton 03-10-2018 04:34 AM

Nice share
 
Quote:

Originally Posted by freebeard (Post 563038)

Thanks for sharing it is a very useful link, However, I see a lot of mechanical + aerodynamic engineering in practice. Might be I'll go for it in future. At present, I'd stuck to the simple design.

LibertyMKiii 03-19-2018 06:12 PM

My basics on this:

Around 25HP rated motor
ESC capable of over 400 amps
A killer battery setup that can discharge high amps for over 15 seconds burst.
(probably a 34V setup? )
custom gears
very efficient aero design.

Good luck to you! This sounds expensive to me!

-Liberty

freebeard 03-20-2018 01:26 AM

Quote:

Originally Posted by Hilton
Thanks for sharing it is a very useful link, However, I see a lot of mechanical + aerodynamic engineering in practice. Might be I'll go for it in future. At present, I'd stuck to the simple design.

Thanks for making it about you, I was replying to LibertyMKiii.

You have the Fossil Fuel Free and Motorcycles / Scooters subforums as well. Do you know how to use the Site Search function?
Around 25HP rated motor
ESC capable of over 400 amps
A killer battery setup that can discharge high amps for over 15 seconds burst.
(probably a 34V setup? )
custom gears
very efficient aero design.
The Buick altermotor is 20hp. But it wants 72-115V. Which means smaller cables for your 15 second bursts. Why do you want [expensive] custom gears? Make it a single speed and double the horsepower rating and uprate the cable carrying capacity to compensate.

Slam-shifting takes time and you only have 15 seconds. Drag racers were skipping gears in the 1950s and beating the sporty-car types.

Does it have to be expensive? I posted a video here about someone who broke world records on a bicycle he made from washing machine parts (allegedly):

http://ecomodder.com/forum/showthrea...tml#post564109

Stubby79 03-20-2018 02:38 AM

Quote:

Originally Posted by Hilton (Post 563299)
Thanks, Is there any formula for this calculation?

I have a spreadsheet that I input the variables in to and it does the math for me. It's the same as the "Aerodynamic & rolling resistance, power & MPG calculator" up at the top of this page under "Tools", except it outputs some more data.

Variables I plugged in were from searching on google. ~ 1.0 .cd (upright rider, unfaired motorcycle), ~8 square feet frontal area. Intentionally using worst-case values (hopefully).

LibertyMKiii 03-20-2018 10:24 AM

Quote:

Originally Posted by freebeard (Post 564265)

Why do you want [expensive] custom gears? Make it a single speed and double the horsepower rating and uprate the cable carrying capacity to compensate.


Does it have to be expensive? I posted a video here about someone who broke world records on a bicycle he made from washing machine parts (allegedly):


Gears help greatly with getting the motor into its sweet spot. As we know the torque falls on its face in higher rpms with electric motors.

Expensive is just my experience with battery arrays and electronics that can handle over 300amps.

I suppose expensive is a relative term depending on what you think is expensive :)

-Liberty


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