Hydrostatic Ranger
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Freshman User
Joined: Sep 2004
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From: Malmo minnesota
Hydrostatic Ranger
Ok i have an idea on a hydrostaticly driven 84 ranger shortbox reg cab. and i wanted to know with the rear end thats in there, how much tourqe does it take to make that lil pickup move?
Post Fiend
Joined: Feb 2003
Posts: 6,940
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From: Eastern WA
Well, you need to consider and account for the many variables as the torque required to get it rolling is going to vary inder different circumstances. If all you want is a gut feel for it, why not just use your torque wrench on a lug nut and see 
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Thread Starter
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Freshman User
Joined: Sep 2004
Posts: 38
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From: Malmo minnesota
Originally Posted by minnesotasix
first of all, i was going to run a Hydraulic motor to the axles u-joint, so i was just wondering how much tourqe it would take to go 55, 70 and so on.
Post Fiend
Joined: Feb 2003
Posts: 6,940
Likes: 2
From: Eastern WA
When pure torque is applied to a body (ie, the wheel), it's constant throughout that body (position irrelevant). This is easily seen by just drawing a free-body-diagram (common engineering practice for statics problems).As for the rear end gearing thing, that's simple enough to address too. The rear end multiples the torque by the axle ratio. So for what you're doing, just divide applied torque at the wheel to determine what the equivlant would be at the driveshaft. In your brainstorming remember that in a mechanical system, horsepower is constant but torque is not.
**If you're still uncomfortable with the torque wrench idea, determine the force applied at the bumper to make it begin to move then just run a quick number to determine the equivalent torque at the axles (r X F, radius times force) and subsequently the driveline.
**If you're still uncomfortable with the torque wrench idea, determine the force applied at the bumper to make it begin to move then just run a quick number to determine the equivalent torque at the axles (r X F, radius times force) and subsequently the driveline.
Last edited by CowboyBilly9Mile; Oct 5, 2005 at 05:42 PM.
