21
May
17

The internal combustion engine of the future

In the not-too-distant future, we will have had to reduce our greenhouse gas emissions to near zero (see, for example, here). Fuel for internal combustion engines will then only be regeneratively produced, which means, that there will be little of it. At that point in time, combustion engines must be extremely efficient to squeeze the last mile out of what little fuel is left for the 10 Billion we will then be on earth.

The most efficient engine configuration is the opposed-piston engine (see, for example, here and here), and the most efficient number of cylinders is 1.

Therefore, under the condition of extreme emission limitation, the single-cylinder opposed-piston engine will prevail.

It might have a smaller and a larger cylinder, with the former used for small and medium speed and the latter for higher speeds or uphill, but will generally run on only one of them.
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