No crankshaft, no problem: Toyota's free piston engine is brilliant 12 years ago
This could be used as a transition from gas to battery cars. Why? Currently one of the most important reasons holding back companies from producing electric cars is the lack of good batteries, but with this, companies can produce cars that convert gas to electricity in order to drive an electric motor. After a few years, when gas becomes even more expensive and batteries get better, we can switch this mechanism to batteries, and that's it.