General Studies · IC Engines
When the spark timing is excessively advanced in a spark-ignition internal combustion engine, the net work output decreases primarily because:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The peak combustion temperature becomes low
- 2Additional negative work is required to compress the burning gas before TDC✓
- 3The peak cylinder pressure becomes low
- 4Mechanical frictional losses increase
Correct answer
Additional negative work is required to compress the burning gas before TDC
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