Comments by "Nikita Kipriyanov" (@nikitakipriyanov7260) on "driving 4 answers" channel.

  1. 07:00 This is exactly the way many steam engines were built, it's called a compound engine; this idea had proven itself to increase efficiency quite and had seen its commercial success, in the form, for example, the most produced steam locomotive, called Ов, in Russian Empire. I did not knew someone would apply that to an internal combustion engine too! But, considering the fact the compound steam was invented quite early in a steam engine history, at least, far before internal combustion was invented, that's logical that the idea was also reused very early, by the 4-stroke engine inventor himself. What's curious though, is that compound technology competed with superheaters, which produced comparable engines. And, latest steam locomotives, for example, were built simple with superheaters, rather than compound. Many compound locos were actually converted to simple with superheaters. These are more robust, I presume? Well, the problem of changing the property of the exhaust in dependence with the load is also known and solved in steam. The locos had all the necessary pipework to start as conventional simple expansion, where the primary steam was supplied to all cylinders; this allowed the loco to start the heavy train, at the expense of wild steam usage. Then, at some point, it switches to its efficient compound mode.
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