Engine 2014: General Subjects

1. A one valve seats upwards, while the other seats downwards
2. B the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
3. C the suction valve springs exert a greater tension than the  discharge valve springs
4. D the discharge valve springs exert a greater tension than the suction valve springs

Tip: press A-D to answer