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What is the minimum cranking speed for a C.I engine without glow-plugs?(a) 150-180rpm(b) 60 to 140rpm(c) 60-90rpm(d) 100-200rpmThe question was asked in unit test.This interesting question is from Testing the Starting System topic in portion Starting System of Automotive Engine Design

Answer» RIGHT choice is (d) 100-200rpm

The explanation: The MINIMUM cranking speed for a RECIPROCATING S.I engine is 60-90rpm, for the rotary engine it is 150-180rpm and for the C.I engine without glow PLUGS is 100-200rpm.


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