An internal combustion engine for gaseous fuel includes a cylinder and a piston for reciprocal movement in the cylinder along a reciprocal axis, whereby a combustion chamber is at least partially delimited by the cylinder and the piston. The piston includes a piston crown facing the combustion chamber, a piston crown projection of the piston crown in a direction parallel to the reciprocal axis and onto a piston crown plane extending transversally to the reciprocal axis having a piston crown center point, the piston crown comprising a piston bowl surface defining a piston bowl and a piston rim portion enclosing the piston bowl surface. A piston bowl opening is the intersection between the piston rim portion and the piston bowl surface. The piston bowl opening has an opening center of gravity in the piston crown plane. The opening center of gravity is offset from the piston crown center point.

An internal combustion engine for gaseous fuel includes a cylinder and a piston for reciprocal movement in the cylinder along a reciprocal axis, whereby a combustion chamber is at least partially delimited by the cylinder and the piston. The piston includes a piston crown facing the combustion chamber, a piston crown projection of the piston crown in a direction parallel to the reciprocal axis and onto a piston crown plane extending transversally to the reciprocal axis having a piston crown center point, the piston crown comprising a piston bowl surface defining a piston bowl and a piston rim portion enclosing the piston bowl surface. A piston bowl opening is the intersection between the piston rim portion and the piston bowl surface. The piston bowl opening has an opening center of gravity in the piston crown plane. The opening center of gravity is offset from the piston crown center point.

A fuel pump includes: a housing with fuel reservoir; first and second axles; respective pluralities of cams fixedly secured to each axle. The first axle and cams are rotated by gas pedal actuation, and meshed gears cause co-rotation of the second axle and its cams. A plurality of housing conduits each have first conduit portions in fluid communication with the fuel reservoir, which transition into second conduit portions in fluid communication with a fuel injector. Pusher rods slidable in each second conduit portion contact spring-biased balls. The gears, cams, and pusher rods ends are positioned in the fuel reservoir. Spring-biased balls also normally block the first conduits. Rotation of the first axle for increased crankshaft rotation speed causes simultaneous rotation of every cam, and each increment of cam rotation into second, third, fourth, and fifth rotational positions sequentially drives a respective pusher rod to provide incremental increased fuel flow.

A fuel pump includes: a housing with fuel reservoir; first and second axles; respective pluralities of cams fixedly secured to each axle. The first axle and cams are rotated by gas pedal actuation, and meshed gears cause co-rotation of the second axle and its cams. A plurality of housing conduits each have first conduit portions in fluid communication with the fuel reservoir, which transition into second conduit portions in fluid communication with a fuel injector. Pusher rods slidable in each second conduit portion contact spring-biased balls. The gears, cams, and pusher rods ends are positioned in the fuel reservoir. Spring-biased balls also normally block the first conduits. Rotation of the first axle for increased crankshaft rotation speed causes simultaneous rotation of every cam, and each increment of cam rotation into second, third, fourth, and fifth rotational positions sequentially drives a respective pusher rod to provide incremental increased fuel flow.