I don't know how the islands, the areas, of specific fuel consumption are plotted but it makes sense there is some throttle operation. In my case, plotting BSFC along the operating line provides a useful guide. Here is one of the better articles about BSFC:
Brake Specific Fuel Consumption
As Julian Edgar points out in the article, partial throttle operation significantly reduces engine efficiency. So it makes sense partial throttle operation is used to map the inefficient parts of the chart.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
Last edited by bwilson4web; 06-26-2011 at 11:47 PM..
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