Did it wine appropriately for it’s age?

It would be easier, but it’s not super critical either. This gives you a general idea of how a 4-cycle engine works. All I was trying to say is you could pick it apart and find everything wrong with it, but at the end of the day, it is just a diagram. But yeah, i agree, it would be easier to make in a diagram vs real life.

It is just a diagram after all, not a precision-built machine, so I don’t think we can expect much in terms of ultra-realism. There are other things wrong with it, too, like no valve overlap, and the firing order has a noticeable lag between cylinders 1 and 3, makes for a very unbalanced engine.

Doesn’t look wrong to me. Red exhaust valve opens as the piston rises and blue opens when the piston drops on each of the cylinders. I will say though, that this does look like an awfully unbalanced engine between cylinders 1 and 3 having so much time between the firing orders, as oppose to 1 to 2 or 2 to 3.