A、increase back pressure during the exhaust process
B、facilitate periodic replacement of the valves
C、reduce the pumping loss associated with scavenging
D、reduce tension on valve springs
更多“Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）”相关的问题
A、fuel valves；exhaust valve B、exhaust valves；inlet valve C、fuel valves；inlet valve D、exhaust valves；fuel valve
A、the beveled edges of the intake valves provide for serf-centering during seating B、intake valves utilize stellite-coated valve seat inserts which reduce wear C、the volume of air passing through intake valves is less than the volume of air passing through exhaust valves D、intake valves are less affected to the corrosive action of exhaust gases
A、the inlet valve is open B、the exhaust valve is open C、both valves are close D、both valves are open
A、the inlet valve is open B、the exhaust valve is open C、both valves are closed D、both valves are open
A、produce a scavenging effect in the combustion space B、equalize cylinder and exhaust manifold pressures C、alleviate the difference in valve size between the intake and exhaust D、flush out condensate that collects after each compression stroke
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