Results 1 to 4 of 4
LinkBack URL
About LinkBacksHybrid View
-
08-30-2010 11:40 AM #1
CHR Member
- Join Date
- Dec 2005
- Location
- Lafayette
- Car Year, Make, Model: 68 Firebird 439 BBC
- Posts
- 745
the difference will be proportional to the change in tire diameter: 3.89:1 with 28" tire = 3.61:1 with 26" tire.... at the same MPH, the RPM will drop 13/14ths (26/28ths).
-ChrisPaint don't make it no faster 
-
08-30-2010 11:50 AM #2
CHR Member/Contributor
- Join Date
- Sep 2007
- Location
- Gardner, KS
- Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
- Posts
- 11,245
Skids typed quicker than me
With your 3.89's and no OD (1:1 final tranny output) you'll turn 3519rpm at 70mph with 26" tires, and 3268rpm with 28" tires which is indeed exactly 13/14th's change.
Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
-
08-30-2010 07:51 PM #3
CHR Member
- Join Date
- Feb 2007
- Location
- Santa Monica
- Car Year, Make, Model: 37 Ford tudor humpback
- Posts
- 1,988
Here's a great little calculator to figure it out..http://www.ringpinion.com/Calc_RPM.aspx
Plug in all the different combos you want and see how it changes your rpms...."It is not much good thinking of a thing unless you think it out." - H.G. Wells
Reply With Quote
Posting Permissions
- You may not post new threads
- You may not post replies
- You may not post attachments
- You may not edit your posts
i've enjoyed the years here . made a lot of friends. most who have left. i see no reason to continue with this so hope to see you somewhere else. i dont think this site will ever be back. it's lived...
Dead!