Cylinder liner having coolant flow balancer and engine power assembly using same

A power assembly for an engine comprising:

• a cylinder head assembly including a cylinder head;
• a cylinder liner coupled to the cylinder head assembly and defining a longitudinal axis;
• a piston assembly including a piston;
• the cylinder liner including an inner liner surface forming, together with the cylinder head and the piston, a combustion chamber, an outer liner surface including a water jacket surface extending circumferentially around the longitudinal axis, and a plurality of combustion air ports for conveying combustion air into the combustion chamber;
• and
• the cylinder liner further including a flow balancer formed on the water jacket surface;
• wherein the water jacket surface includes a conical upper surface and a cylindrical lower surface, and the flow balancer is formed on the cylindrical lower surface.

An engine comprising:

• an engine housing forming an air box;
• a power assembly supported in the engine housing and including a one-piece cylinder liner, the cylinder liner defining an axis and having formed therein a plurality of combustion air ports fluidly connected to the air box, and including an outer water jacket surface extending between the plurality of combustion air ports and an upper liner end, and an outer air annulus surface extending between the plurality of combustion air ports and a lower liner end;
• the power assembly further including a jacket piece attached to the cylinder liner and forming, together with the outer water jacket surface, an upper water jacket;
• an air annulus formed between the outer air annulus surface and the engine housing and fluidly connected to the air box;
• a flow balancer for coolant, formed on the outer liner surface at a flow balancer axial location relative to the axis;
• and
• the power assembly further including a piston movable between a first position in the cylinder liner where the piston is positioned below the flow balancer axial location and low enough in the cylinder liner to permit admission of air through the plurality of combustion air ports, and a second position where the piston is positioned at least partially above the flow balancer axial location.