Physics Question with gears
Thread Starter
Seasoned Member
Joined: Jun 2008
Posts: 322
Likes: 0
From: Green Bay, WI
Year: 1993 2 door
Model: Cherokee
Engine: 4.0L H.O.
Physics Question with gears
Using this page and the Find RPM chart:
Constants:
MPH = 55
Transfer Case Ratio = 1
Tire Diameter = 31
Variable
Axle Ratio = 3.07 ; 4.10
Transmission Ratio = 1 (4th gear) ; 0.79 (5th gear)
Heres the deal. 4th gear with 3.07 gears is approximatly the same RPM as 5th gear with 4.10 ratio at the same speed. Does the engine care what gear its in at the same RPM?
Could you just drive in 4th gear and save 5th for overdrive instead of re-gearing? Any adverse effects?
Constants:
MPH = 55
Transfer Case Ratio = 1
Tire Diameter = 31
Variable
Axle Ratio = 3.07 ; 4.10
Transmission Ratio = 1 (4th gear) ; 0.79 (5th gear)
Heres the deal. 4th gear with 3.07 gears is approximatly the same RPM as 5th gear with 4.10 ratio at the same speed. Does the engine care what gear its in at the same RPM?
Could you just drive in 4th gear and save 5th for overdrive instead of re-gearing? Any adverse effects?
CF Veteran
Joined: Nov 2008
Posts: 6,989
Likes: 4
From: Oak Harbor, WA.
Year: 1987
Model: Cherokee
Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
I absolutely CAN do this. The only thing is that the 4.10 gears would be much better to have for off roading and if you have larger than stock tires. You theory works fine for once you get the rig moving but with larger than stock tires and stock gears it will require more "go pedal" to get the rig moving each time so you'll be using more fuel. Good use of the noggen and basic math to show other guys how this works.
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