Electric Motor Efficiency Versus V8 Illustrated (Video)


There are lots of discussions on how electric motors are simply more efficient at turning stored energy to power than gas motors, right?  Here’s a project that demonstrates it visually.

This guy, David Robert, put together a V8 motor, but instead of using cylinders and pistons to drive the crankshaft he used eight solenoids.  They are simply converting current to a magnetic field, and pushing the crankshaft on its merry way. Somehow, using electricity to make a V8 go demonstrates the incredible complexity, as well as inefficiency, of the machine better than anything else we’ve seen.

We’re not even going to talk about the losses of the combustion process.  Do we even need to?

Have a look:

Our first impression is there are so many moving parts, right? All those parts are doing is to convert electric power to mechanical power, which an electric motor does as simply as this:

Hats off to Mr. Roberts for some amazing work and a great demonstration as well! (To “Randy C” too – glad it makes the grandkids happy!)

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8 Comments on "Electric Motor Efficiency Versus V8 Illustrated (Video)"

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Isn’t electricity wonderfull?

The basic fallacy here is that Electricity is a basic fuel. It is not.

A prime mover is always required. These days it is usually a boiler, connected to a steam turbine, or combining the process, in a gas turbine.

Someone could take the exact opposite tack and say that since my solar panel system is only 12% efficient, I should get rid of it and replace it with a 30% efficient central station steam turbine, to get the same amount of electricity for my house.

That said, the erector set style v-8 engine is quite cool. I’d be interested in the specifics of it, and whether he has actually tried to run a real load with it (in otherwords what BHP load will it run?).

It shows that it is still more efficient than a gas engine, because you can reduce the RPM to very low speeds, yet still get torque. A vehicle with this V8 motor needs no transmission!