Quote:
Originally Posted by wungun
High load I can understand...
But high rpm isn't that efficient because of the frictional and pumping losses...
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It is that efficient, the map shows the efficiency through the whole rpm band. It shows the efficiency drop due to frictional losses.
Gearing is definitely a big deal in the efficiency of the vehicle. However, my point was that you can not 'work an engine too hard'. Thus, the idea of having too small an engine for fuel efficiency reasons is mute. Obviously there is a point at which it becomes too small to be practical, but that was not the intent of the article.