What is the hottest part of the exhaust valve?

The hottest part of the exhaust valve is typically the tip or the face of the valve, where it comes into direct contact with the exhaust gases exiting the combustion chamber. This area experiences extreme temperatures due to the high heat of the exhaust gases, which can exceed 1,500°F (815°C) in some engines. Additionally, the valve stem may also heat up, but the face generally endures the most intense thermal stress. Proper material selection and cooling strategies are essential to prevent overheating and ensure the valve's longevity.