| abstract |
(EN) Provided is an internal combustion engine which is highly compatible with reduction of cooling loss of an internal combustion engine, suppression of intake air efficiency decrease, and suppression of knocking occurrence. A combustion chamber enclosed by an inner wall of a cylinder bore, a cylinder head, a valve and a piston, and a coating layer disposed on at least a part of the inner wall of the combustion chamber, wherein the thermal conductivity of the coating layer is, And the thermal conductivity of the coating layer is reversibly increased in accordance with the temperature rise of the coating layer, and the thermal capacity per unit area of the coating layer is 0 kJ / (m < 2 > And not more than 4.2 kJ / (m < 2 > K). |