Spark ignition engines’ efficiency is mainly limited by three major factors, namely, knocking, fuel enrichment, and throttling. Figure P9.4 depicts the full-load curve of SI engine. Schematically...

Spark ignition engines’ efficiency is mainly limited by three major factors, namely, knocking, fuel enrichment, and throttling. Figure P9.4 depicts the full-load curve of SI engine. Schematically identify zones corresponding to knocking, fuel enrichment, and throttling on engine operating map. You can draw few contour lines in the identified zones.