For engine operating with rich mixtures the optimum spark timing
A)must be advanced
B)must be retarded
C)must be at TDC
D)none of the above

Name: For engine operating with rich mixtures the optimum spark timing A)must be advanced B)must be retarded C)must be at TDC D)none of the above
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Question

Quizplus · Accepted Answer

For rich mixtures, the combustion process is faster, so the spark timing must be advanced to ensure complete combustion before the piston reaches the top dead center (TDC).

For Engine Operating with Rich Mixtures the Optimum Spark Timing