Here the shaft with a single crank, but the two-cylinder comes from the Fiat 126 engine, on which base I built my new4stroke .. A colleague of such a car drove 100,000 km without renovation. I can see one crank enough ...
The shaft is also fused on two bearing shells .. it was created due to the seizure of the engine dynamometer. I thought that at 3500 revs per min which was generated by the electric dynamometer on which I mounted my engine, nothing bad will happen .. but as a result of 3 times in most of the forces coming from the gaseous forces, the engine faded. In the second photo, the connecting rod, which was completely polished, that's why you can clearly see the change of colors in the sky, which occurred due to this seizure ..
Of course, I rebuilt the engine, but I will not put it on the brakes anymore ..
My project Feliks Commer T4 engine will have about 500 hp, with a weight of about 500 KG, here you can make such a stellar version put together 10 engines (on the left and on the left side of the star) It will weigh about 6 tons and had 5,000 HP. .. It will be suitable for the propulsion of a small ship .. or for the production of 5 MW of electric energy .. with long durability and efficiency ..
In the whole engine there is only one bearing in the connecting rod. The rest are half-turn pins. So, the engine's failure will be significantly increased.
here's a discussion on how to match it to Formel 1 https://www.highpowermedia.com/RET-Monitor/3944/the-commer-double-knocker