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E J Resnick
Joined: 29 Oct 2008
Posts: 52
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 Posted: Fri Jun 15, 2012 8:38 am Post subject: Gearing |
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| Is there is major difference between running a 12 tooth front sproket versus a 13 tooth sproket if you adjust the rear gear for the correct ratio? |
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Matt Clark
Joined: 26 Apr 2005
Posts: 175
Location: United States, Florida, Tampa
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| Posted: Fri Jun 15, 2012 9:41 am Post subject: |
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It's a ratio so as long as you adjust the other part equally it should have no effect.
Last edited by Matt Clark on Thu Jun 21, 2012 8:08 am, edited 2 times in total |
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Chris McGinley
Joined: 28 Nov 2008
Posts: 358
Location: United States, New Jersey, Sewell
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| Posted: Fri Jun 15, 2012 3:55 pm Post subject: |
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This topic will probably stir up some controversy...but, here goes...
I've found the 11 tooth gear to work better on twisty and tight tracks .... the motor seems to spin up a bit better. I'm sure a physics expert can explain the actual effects of the fulcrum, inertia, etc...I won't purport to be that expert  However, I don't know that the smaller driver (when you have an option) is best in all situations.
I'd recommend testing each gear at your track and see if you get a different result on the stopwatch - that's the only way to know for sure.
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Chris McGinley
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Angel ramirez
Joined: 01 May 2007
Posts: 129
Location: Mexico, QUINTANA ROO, CANCUN
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| Posted: Wed Jun 20, 2012 5:55 am Post subject: |
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11 tooth smaller diameter = less lever resistance against the engine = faster acceleration.
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Don Holmboe
Joined: 26 Aug 2002
Posts: 323
Location: United States, Oregon, Tigard
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| Posted: Wed Jun 20, 2012 7:01 am Post subject: |
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The incease in "leverage" at the driver is offset by the decrease in leverage at the axle. To put in bluntly, someone is smokin too much dope when analyzing this issue. The overall "leverage" is the RATIO.
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Don Holmboe
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Ihor Bilyy
Joined: 13 Jul 2005
Posts: 536
Location: United States, Georgia, Canton
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| Posted: Wed Jun 20, 2012 10:34 am Post subject: |
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| Don Holmboe wrote: | | The incease in "leverage" at the driver is offset by the decrease in leverage at the axle. To put in bluntly, someone is smokin too much dope when analyzing this issue. The overall "leverage" is the RATIO. |
EKN should add Like button I would click here |
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Scott Grenier
Joined: 23 Nov 2002
Posts: 69
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| Posted: Wed Jun 20, 2012 11:10 am Post subject: |
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| I was thinking the same thing Ihor! |
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John Savage
Joined: 30 Jan 2002
Posts: 1252
Location: United Kingdom (Great Britain), not USA state,
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| Posted: Wed Jun 20, 2012 3:26 pm Post subject: |
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| Scott Grenier wrote: | | I was thinking the same thing Ihor! |
All I want to know is where is Don getting his dope?
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al nunley
Joined: 13 Nov 2006
Posts: 3029
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| Posted: Thu Jun 21, 2012 6:45 am Post subject: Re: Gearing |
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| E J Resnick wrote: | | Is there is major difference between running a 12 tooth front sproket versus a 13 tooth sproket if you adjust the rear gear for the correct ratio? |
This has been debated more times then you can count on Bob’s 4cycle forum.
Both view points, pro and con, have been posted many times.
How about testing it for us and report back. Lots of people have said they’ve tested it and both conclusions have been reported. It seems a never ending discussion.
Myself, I think many can’t calculate a gear ratio.
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If the data does not support the theory, get a new theory. (Al Nunley)
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45 years, in and around karting |
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