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

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

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons
Increase inertia force of the rotating crankshaft
Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation

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