I want to know if i have a strong rare earth magnet attached to top of an aluminum piston in a typical v8 combustion engine with an electromagnet at top of piston chamber instead of a spark plug "taking into account everything else needed to make this work has been done" how much power size of electromagnet, would be needed to produce same amount of force 6300 pounds to get the engine going? The magnets can both repel and attract if need be. Is this possible? 14679.1314 newtons = 6300lbf 28035 newtons = 6300lbs
You are basically describing a solenoid engine, these are quite functional, and could probably be made large enough to propel a full sized car. Although not a very energy efficient, or smooth operating design for an electric motor. Here is a video link to a small 4 solenoid engine: https://www.youtube.com/watch?v=x4im3M9IFcI If you type in "solenoid engine" in their search line, you will find many more of different designs. The main problem with the design you describe, is that the magnetic force would be very weak when the piston was at the bottom of the stroke. You would only have a strong magnetic force toward the top of the stroke. This is because a magnetic force drops off sharply with distance. There are more efficient solenoid designs.
You have some of the ideas right. Magnetic forces are what makes an electric motor run. But things are usually arranged differently.
You are suggesting using an electromagnet to push and pull a magnetic piston. Then the car's crankshaft will convert back and forth motion to rotary motion. It is more common to arrange magnets and electromagnets so they directly rotate.
It is possible to make an electric motor strong enough to run a car.
Usually electric cars are smaller than cars that use a V8 engine. Perhaps this is because an electric car needs a lot of heavy batteries, and smaller means less batteries. Perhaps it is because electric cars appeal to people that want economic cars. But a bigger electric car could be made.