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Problem(5) Design a valve spring of a petrol engine for the following operating conditions: - Spring load when the valve is open = 400 N - Spring load when the valve is closed = 250 N - Maximum inside diameter of spring = 25 mm - Length of the spring when the valve is open = 40 mm - Length of the spring when the valve is closed = 50 mm - Maximum permissible shear stress = 400 MPa

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