An engine valve spring must exert a force of 60 lb when the valve is closed and 100 lb when the valve is open. The lift is 5/16 in. Material tests τyp = 90,000 psi and τ′e = 48,000 psi. Fs = 1.5. If the spring index is 6, find the theoretical wire diameter. Also find the number of active coils and the initial compression of the spring.
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