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What is the minimum cranking speed for a rotary S.I engine?(a) 150-180rpm(b) 60 to 140rpm(c) 60-90rpm(d) 100-200rpmThe question was posed to me by my college professor while I was bunking the class.Question is taken from Starting Motor Switches and Control Circuit topic in division Starting System of Automotive Engine Design

Answer»

Right option is (a) 150-180rpm

Explanation: The minimum cranking SPEED for a RECIPROCATING S.I ENGINE is 60-90rpm, for the rotary engine it is 150-180rpm. Rotary engines are the high-speed engine that are rarely used in RACE cars.



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