For me it's always exciting to chart new technologies, especially when they result in a cost-effective manufacturing process, and a practical application.
I was around in the 60s, when Perth inventor Ralph Sarich came up with the Orbital Engine. Sadly, a great concept which never came to production because of cost and complexity.
We've seen Mazda persist with its version of Felix Wankel's Rotary engine concept - an engine that's even powered Le Mans racers.
Now, from Nissan-Infiniti the first practical and commercialised variable compression engine, and it's brilliant. It makes it's debut in Infiniti's QX-50 crossover.
Here's how it works:
First a cinemagraph shows the principle:
I will use the description from the Infiniti press kit, rather than rewrite it: