Here’s an old educational video Chevyproduced in the ’40s that explains the basics of how an engine works. Much of this information is still relevant too! Check it out:
Engines haven’t changed much since their early days. Sure, there’s been the addition of forced induction, fuel injection, and hybrid power systems; but the basic mechanics are still basically the same. I have an old textbook from the University of Wisconsin Madison from the 1915 called “The Gasoline Automobile” that I regularly flip through. Its a fantastic look into the past when supercharging was a new technology for production cars and wooden frames were the norm.