Correct Mixtures for Otto Engines

The objective of this paper is to change a prevailing view on what is a correct mixture ratio for otto engines and to correct a malpractice that grew out of it. Differentiation between “best power” and “best economy” mixtures were found illusory. The wedge charts proved very useful for a clear understanding of the intricate relations.

The origin of the misconceptions is traced in the history of the internal combustion engine.