What causes power loss? - JeepForum.com

 
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post #1 of 5 Old 12-12-2007, 07:54 AM Thread Starter
dogbluedrummer
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What causes power loss?

It is a fact that going from stock tires to larger tires results in a loss of power (without regearing). My questions is, what is the reason for this? This is an issue of physics. Below are some suggested reasons:

Weight of the tire
Diameter of the tire
Rolling resistance (contact surface area)
Tire mass (weight is not the same thing as mass)


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post #2 of 5 Old 12-12-2007, 09:00 AM
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Are you just making idle chit-chat?

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post #3 of 5 Old 12-12-2007, 12:53 PM Thread Starter
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Not idle chit-chat. I want to understand the physics behind the fact.

Patriot Blue 2001 TJ
Everything I need to fix on the heep: ABS indicator, speed 4 on the blower fan, torn softop over driver's head, both seat release/tilt cables, missing center cap on spare, broken under hood light, wire up the CB, wiring problem with the reverse lights, broken bottle jack, leaky front and rear pinion seals, loose trackbar relocation bracket, torn drivers seat on the side, broken center console lock, lost nuts for door hinges, squeaking centering ball, loose parking brake cable, oil change and rotate the tires.
My build threadhttp://www.jeepforum.com/forum/showthread.php?t=528892
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post #4 of 5 Old 12-12-2007, 01:42 PM
Jerry Bransford
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A larger diameter tire also has a longer radius, which equates to the tire having more leverage (moment/arm) against the drivetrain which means the engine must develop more power to overcome that increased leverage.

Plus a larger tire can be thought of as a larger gear against a smaller gear (the ground) that requires more force to turn (a higher ratio).

Then there's the larger tire's increased rolling resistance, its increased weight, increased enertia, and its increased mass that the engine must work harder in order to overcome. Also a factor is that taller tires cause a Jeep to sit higher up in the windstream for higher wind resistance that must also be overcome.

Those will do for starters, right?

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post #5 of 5 Old 12-12-2007, 01:53 PM
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Quote:
Originally Posted by Jerry Bransford
A larger diameter tire also has a longer radius, which equates to the tire having more leverage (moment/arm) against the drivetrain which means the engine must develop more power to overcome that increased leverage.

Plus a larger tire can be thought of as a larger gear against a smaller gear (the ground) that requires more force to turn (a higher ratio).

Then there's the larger tire's increased rolling resistance, its increased weight, increased enertia, and its increased mass that the engine must work harder in order to overcome. Also a factor is that taller tires cause a Jeep to sit higher up in the windstream for higher wind resistance that must also be overcome.

Those will do for starters, right?
This is all wrong, power loss occurs because of increased weight of the heavier muffler bearings which are required when installing bigger rubber.

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