Method for adjusting volume of combustion chamber of engine

Abstract

In order to adjust the volume of the combustion chamber with high accuracy, a cylinder headincludes a recessconstituting part of the combustion chamber of the engine and a mating surface for a cylinder block. The recessincludes a plurality of openings to which a plurality of specific members are attached respectively. The mating surfaceis formed to have a cutting stock with respect to three-dimensional shape data of the cylinder headdesigned to have a target combustion chamber volume. The adjusting method further comprises measuring the surface shape of the recess and the shape of the mating surface around the recess by successively changing the irradiation position of a laser beam using a line laser displacement meter. The adjusting method further comprises removing data of regions equivalent to the plurality of openings from measurement data by comparing the measurement data obtained by the line laser displacement meter with the three-dimensional shape data. The adjusting method still further comprises: calculating the volume of the recessbased on the measurement data from which the regions equivalent to the plurality of openings are removed; and deciding the cutting amount of the mating surfaceby comparing the calculated volume of the recesswith a volume of the recessbased on the three-dimensional shape data.