Quote:
Originally Posted by wa2ise
As I now (mis)understand it, overdrive is when the car tires rotate faster than the engine crankshaft. Which makes sense to do only at highway speed.
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No! you neglected the final drive reduction ratio, on the order of 2.5 to 4 :1. Do the math... If you have a tire that is 2 feet in diameter, the circumference is about 6.3 feet... if it was turning, say 2500 R.P.M. , that would be almost 16,000 feet per minute, or about 3 miles per minute!
jr