Automobile Engineering in ME
Highest useful compression ratio (HUCR) is the highest compression ratio at which the

Engine gives maximum output
Fuel can be used in a test engine without knocking
Engine is most efficient
Engine can run

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Automobile Engineering in ME
The crankcase dilution means

Dilution of fuel in the crankcase
Dilution of mixture passing through crankcase in two stroke engines
Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of oil by water in the crankcase

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