Canning combustion chamber wall surface with the porous heat insulation material internal combustion engine

摘要

PURPOSE:To improve volumetric efficiency ever so better, by covering a combustion chamber wall surface such as the top of a piston or the like of an internal- combustion engine with a porous heat insulating material. CONSTITUTION:A combustion chamber wall surface such a piston top, a head bottom, liner, etc., with a porous heat insulating material having a heat insulating material 1, independent minute holes 2 and surface layers 3'. Porosity of the porous heat insulating material is set down to a range of more than 80%. With this constitution, since heat follow-up properties become so good, such an internal-combustion engine as being excellent in volumetric efficiency is securable.