Q1.Design a valve spring of a petrol engine for the following operating conditions: Spring load when the valve is open = W1 N; spring load when the valve is closed =W2 N; Length of the spring when the...

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Extracted text: Q1.Design a valve spring of a petrol engine for the following operating conditions: Spring load when the valve is open = W1 N; spring load when the valve is closed =W2 N; Length of the spring when the valve is open = L1 mm; Length of the spring when the valve is closed = L2 mm, the spring index is 8 and the design factor of safety is 2. If the yield stress in shear is 810 MPa and endurance stress in shear is 440 MPa, the modulus of rigidity for the spring material may be taken as 80 kN/mm?. Find: 1. Size of the spring wire, 2. Mean diameter of the spring, 3. Number of active turns of the coils. %3D W1 W2 L1 L2 480 304 45 60