Are We About to Have an Electric-Motor RPM race?

Internal-combustion engines are making impressive strides in rotational speed. The Lamborghini Temerario has a 4.0-liter twin ...
Steel Horse Rides on MSN

Is an electric motor RPM race about to become the new horsepower war?

Instead of bigger engines and louder exhausts, the new battleground is compact machines spinning at speeds that would shred ...