Electric motors are heavy - power to weight is ugly. Price is high. This 250 Hp motor is $14000 and 2400 lb.
https://www.grainger.com/product/MAR...e-Motor-44Z676
To put into perspective what Ron said about the power grid. Let's assume we convert to electric powered cars. It takes about 30 Hp or 40 Kw to cruise down the road on level ground at around 60 mph. Much more to accelerate, but let's ignore that. So if on average ever person in this country were to cruise one hr in a car, five days a week, 52 weeks per year, we would use 40 * 5 * 52 = 10,400 KwH of electricity per capita on transportation, anually. I think we can agree this is a conservative number and it does not include transportation of goods (trucking). For the year 2015 the Per capita power consuption in the USA was 12,915 KwH. Bottom line reality is that for everyone to conver to electric cars we will have to double the size of the power grid. That or each individual will have to purchase there own windmill or solar cell to charge their own car.
https://en.wikipedia.org/wiki/Electr..._United_States