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What is present inside the hollow stem of the valve?(a) Ethyl-glycol(b) Magnesium(c) Sodium(d) MercuryThis question was posed to me by my school teacher while I was bunking the class.This is a very interesting question from Poppet Valves topic in portion Valve Timing Technologies of Automotive Engine Design

Answer»

Right option is (c) SODIUM

The best I can explain: The exhaust valve TEMPERATURE in modern ENGINES reach very high. So, sodium is present inside the hollow stem of the valve. These valves are also USED in Heavy engines.



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