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← TechnologyWhich effect reliably follows when liquid fuel enters the combustion chamber *after* the piston reaches top dead center in a high-performance engine?
A)Increased unburnt hydrocarbon emissions✓
B)Enhanced thermal efficiency of combustion
C)Reduced peak cylinder pressures achieved
D)Improved fuel-air mixture homogeneity
💡 Explanation
Increased unburnt hydrocarbon emissions occur because *wall wetting* leaves fuel uncombusted on cold cylinder walls. Therefore, emissions increase, rather than efficiency improvements arising from complete combustion under ideal stoichiometric conditions typically achieved with timed injection.
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