Patent ID: 7810479

Claim:
A homogeneous charge spark ignition internal combustion engine comprising: (a) at least one piston reciprocal in at least one cylinder, the cylinder having a cylinder head, the cylinder head having a bottom open combustion chamber cavity, as the piston approaches top dead center, the top surface of the piston combines with the lower portion of the cylinder head to define a single combustion space which confines the entire compressed air fuel volume, flat portions of the cylinder head at the parameter of the combustion chamber cavity come in close proximity with flat surface portions of the piston to define squish area(s); (b) the piston having a compression face of circular shape; and (c) at least three grooves of uniform width formed in the piston compression face and the at least three grooves extending nearly across the entire compression face, said at least three grooves channeling air fuel mixture from the squish area across the compression face of a piston top to pre-determined locations at the base of the combustion chamber cavity.