Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 36 users online :: 4 registered, 0 hidden and 32 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Help with my Chainsaw bike

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

Unread postAuthor: MisterSteve124 » Wed Oct 31, 2007 5:48 am

The engine is 42ccs and I'm gonna use a jackshaft to hopefully get a gear ratio of atleast 14:1 right now I have 2.75:1 lol.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: jrrdw » Wed Oct 31, 2007 6:24 am

The only way a jack shaft is going to change the ratio is if you use 2 chains and 2 different size sprockets on each end of the shaft. Other wise it's a idler gear shaft.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: ammosmoke » Wed Oct 31, 2007 1:52 pm

The smaller the gear on the engine, the easier it is going to be for it to move. And the wheel gear should be one of the bigger ones. Think of it like a torque wrench. What is easier to turn, a small one or a big one? Well, a big one of course, more torque. What is easier to twist? A small bottle cap or a big one? A small one, less resistance.

Next time when you are riding a mountain bike, look at the gears while shifting. The higher gears are the small ones. A small one will turn many times faster than a big one, but it is harder because there is less torque. A larger drive gear will spin the wheel gear faster because there is more teeth, but it is harder to turn because there is more resistance.

Get it?
  • 0

<img>http://www.speedtest.net/result/309559995.png</img>
User avatar
ammosmoke
Brigadier General
Brigadier General
 
Posts: 1011
Joined: Wed Sep 27, 2006 10:57 am
Reputation: 0

Unread postAuthor: MisterSteve124 » Wed Oct 31, 2007 1:52 pm

Yeah I know that's what I'm going to do. Try and get like a jackshaft with like a 10 tooth sprocket and a 30tooth or the biggest difference I can find.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: jrrdw » Wed Oct 31, 2007 5:08 pm

Here, a wide selection to feast your eyes on! You can even get blanks and drill your own center holes and bolt pattern.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: MisterSteve124 » Thu Nov 01, 2007 2:33 pm

I'm using two jackshafts with gears in order starting with drive and ending with the rear of: 13, 20, 8, 20, 8, 36 for a total gear ratio of 19:1 :P . Now I have 2.76:1 so huge difference. With that set up I won't burn out my clutch I will have lots of torque and go around 40mph! I'll post the results once I get it all installed and working.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: dewey-1 » Thu Nov 01, 2007 3:43 pm

--
  • 0

Last edited by dewey-1 on Sun Apr 20, 2008 3:30 pm, edited 1 time in total.
User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: MisterSteve124 » Thu Nov 01, 2007 5:11 pm

Yeah you are right that was the calculation I did with a 13 drive sprocket and a 22 tooth sprocket on the jackshaft. I will be able to tension them and they are all out of the way from anything since they are above the rear tire. But the drive sprocket will have a chain gaurd and I'm sure I'll fabricate one for the others once I get it all installed.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Previous

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

cron
Reputation System ©'