Posted by jdemaris on October 31, 2008 at 19:48:18 from (72.69.238.181):
In Reply to: 4wd question posted by dave2 on October 31, 2008 at 14:48:53:
It's not really as simple as one wheel driving in front and one in back. The differential sends power to both wheels on each axle (i.e. four in total) - but on each axle, the wheel with the least traction gets the most power. So, even if one wheel is spinning, it doesn't mean there isn't any power pushing on the other. It's just not enough to move the car/truck. The only time there is just about no power on the non-moving wheel - is when the other, spinning wheel, has absolutely no traction - like when it's off the ground. It's an inverse situation. On one axle, the wheel with 80% of the traction gets 20% of the power, whereas the other wheel with 20% of the traction gets 80% of the power. Sometimes if you carefully apply the brakes, you can equalize the load on all the wheels and make all spin.
Oliver Cletrac crawlers used automotive type differentials to run the tracks and also could lose all power to one track if the other was up in the air. Even so, they advertised it as having power to both tracks at all times - which was almost true - but not equal power.
By the way, I just picked up a 99 Kia Sportage to use as a winter-beater. 4WD, and 5 speed trans. After looking at it closely, I was suprised to find out the 2 liter engine is a Mazda design, and the trans is a German Gertrag - same make as the trans in my Dodge Cummns-diesel truck. I just drove it 900 miles to Michigan (where I am right now) and got 29 MPG with it. I'm pretty impressed with it.
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