you might be interested in howacarworks.com. I stumbled across these videos on youtube earlier this year when I was researching the topic. I was unwilling to pay because it was more for my own curiosity than an actual need to learn but it seemed pretty thorough.
Thanks for the link!
Man, that site has come a LONG way in the past couple of years. I haven't seen it since probably 2015. Back then, the diagrams were super useful, and the content easily understandable. Now it looks like a Mechanics University!