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In the textbook, Heywood also has a figure showing the effect of increaing EGR on BSFC for moderate burn rate and fast burn rate engines. For moderate burn rate engines, BSFC decreased (mpg improved) as EGR went from 0% to ~7% EGR, then reversed. For fast burn reate engines, BSFC decreased (mpg improved) as EGR went from 0% to ~18% EGR, then reversed.
How do you determine which burn rate your specific engine uses (moderate -vs- fast)?
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