Custom gears... - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 02-10-2007, 08:22 AM   #1
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Custom gears...

Well, just one actually. Does anyone know what would be involved in making a much lower 6th gear for a motorcycle? Something that would cut engine speed in half compared to the stock 6th gear.
__________________

__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-10-2007, 08:49 AM   #2
Registered Member
 
Join Date: Dec 2006
Posts: 113
Country: United States
I'd suggest trying a smaller sprocket on the rear wheel first. It's a lot easier and cheaper to change out, so you'll be able to dial in the top end a lot more quickly for lower cost.

It also has the advantage of changing all the ratios instead of just one, so there'll be less of a jump in engine speed when you need to downshift for an incline at speed.

The tradeoff is that first-gear acceleration won't be as quick.
__________________

__________________
GasSavers_Bruce is offline   Reply With Quote
Old 02-10-2007, 09:06 AM   #3
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Unfortunately the bike I had in mind is shaft driven, so I figured it'd be easier swapping out 6th than it would be to fiddle with this. And, like you said, this would hurt acceleration for all the other gears as well.
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-10-2007, 09:06 AM   #4
|V3|2D
 
thisisntjared's Avatar
 
Join Date: Mar 2006
Posts: 1,186
Country: United States
Send a message via AIM to thisisntjared
Quote:
Originally Posted by Bruce View Post
I'd suggest trying a smaller sprocket on the rear wheel first.
i agree. in theory every gear will not be as quick, but it is definitely a lot easier and cheaper

EDIT: i would get a different bike in mind
__________________
don't waste your time or time will waste you
thisisntjared is offline   Reply With Quote
Old 02-10-2007, 09:13 AM   #5
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
But it's free! FREE!
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-10-2007, 10:10 AM   #6
Registered Member
 
Join Date: Sep 2006
Posts: 409
Country: United States
I have the same situation. 60 mph in 6th gear is a mind boggling 5000 rpm!!!! I don't want to get a higher geared setup, because it's 1st and 2nd are plenty tall to start with (wheelies are a bit tricky)
__________________
red91sit is offline   Reply With Quote
Old 02-10-2007, 10:27 AM   #7
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
Shaft Drive you say? Overdrive unit then
__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 02-10-2007, 10:55 AM   #8
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Hmm... Interesting. I have no clue how I would make one of these, but my uncle's been studying transmissions, and can make anything. Thanks for the info!
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-10-2007, 11:56 AM   #9
Tuggin at the surly bonds
 
Silveredwings's Avatar
 
Join Date: Apr 2006
Posts: 839
Country: United States
Quote:
Originally Posted by skewbe View Post
Shaft Drive you say? Overdrive unit then
That would work but it may be quite a project (I get it ). The thing is a planetary gear system about the size of a watermelon with an electro-hydraulic clutch, and weighs almost as much as a transmission:



It has to remain spinning fast enough to make atleast 400 psi of oil pressure in order to operate (usually shares its oil with the tranny). A quote from elsewhere on this site regarding the Laycock De Normanville OD:
Quote:
Let’s think for a minute why overdrives were put in cars in the first place. I mean after all, anyone can put in a 5th gear on a transmission, why an overdrive? First of all the British never do anything the way we expect or anyone else does it. This was especially true in the 40’s, 50’s and 60’s and is why we have such interesting cars from that period. Laycock overdrives are really like a manually initiated mini automatic transmission. (I personally think a guy named Rube Goldberg had a major part in their design). The important thing to remember is that it was added as an option on most cars in order to reduce engine RPM (and consequently wear) on the highway and increase fuel mileage.


YMMV
__________________
Reality is merely an illusion, albeit a very persistent one. - Albert Einstein
Silveredwings is offline   Reply With Quote
Old 02-10-2007, 12:24 PM   #10
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Jesus that's big. I may be better off with a one off sixth gear... Course I don't even know if it's doable until I crack open the tranny.
__________________

__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
First Fuel Up kingbug Fuelly Web Support and Community News 3 03-31-2013 12:20 AM
Partial Fuel-up Calculations Improvements ryogajyc Fuelly Web Support and Community News 16 04-17-2012 09:25 AM
Any chance of more metric/imperial hybrid options? ZilogJones Fuelly Web Support and Community News 1 01-14-2010 03:18 AM
Dan: Pimping for the del sol SVOboy General Discussion (Off-Topic) 8 04-08-2006 05:12 PM
Hey everyone! mtbiker278 Introduce Yourself - New member Welcome 15 03-26-2006 11:02 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 05:08 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.