Patent ID: 8869771

Claim:
A combustion chamber construction for an engine, the construction comprising: an inlet side sloping surface which is formed on one side of a pentroof apex portion as a boundary and which has an inlet port; an exhaust side sloping surface which is formed on the other side of the pentroof apex portion as the boundary and which has an exhaust port; and a flow improving portion, formed between the inlet port and exhaust port, and including: an inlet flow surface which is formed by recessing part of the inlet side sloping surface; and an exhaust side guide surface, one end of which is connected to an exhaust surface of the exhaust side sloping surface and the other end of which is connected to the inlet flow surface, wherein an angle formed by the inlet flow surface and the exhaust side guide surface is smaller than or equal to an angle formed by the exhaust surface and the inlet flow surface.