A.prevent piston ring wear
B.shorten the ring break-in period
C.prevent cylinder liner glazing
D.appear slick and glazed
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A.lower the no-load RPMs
B.provide more air for combine with the fuel
C.increase the no-load RPMs
D.provide more fuel combine with the air
A.high firing pressure
B.overload of that particular cylinder
C.smoky exhaust
D.cooling water temperature rise
A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency
A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio
A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above
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