In a SI engine, combustion stage I takes 1 ms and combustion stage II – McqOptions

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1.	In a SI engine, combustion stage I takes 1 ms and combustion stage II takes 1.5 ms when the engine runs at 1000 rpm. If stage I time duration is independent of engine speed what will be the additional spark advance necessary when the engine speed is doubled?
A.	0°
B.	6°
C.	12°
D.	24°
Answer» C. 12°

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