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Click on image for the lowdown. 
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| | | | Joined: Feb 2011 Posts: 1,362 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 1,362 | How fast at what rpm for what gear ratio?
Engine RPM / gear ratio = tire RPM
Pi x Tire diameter in inches x RPM of tire = inches per minute x 60 = inches per hour.
inches per hour / 63360 = miles per hour
Pi = 3.1415926
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Rear end gear ratio is multiplied by the transmission gear ratio.
The gear system is a torque multiplier. With zero mechanical losses in the system, the HP will remain the same from Flywheel to the axle shafts, since that never happens rear wheel HP is always less than engine HP.
Last edited by Truckrolet; 02/10/2013 1:26 AM.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.
As of 10-26-2022, A 55.2 Taskforce long bed now the work begins
| | | | | Joined: Mar 2010 Posts: 58 'Bolter | | 'Bolter Joined: Mar 2010 Posts: 58 | | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | This is the calculator I use;
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf
It is actually for Diesel engines, but if you double RPM, it will double the MPH or you can use the formula at the bottom of the page. | | |
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