Lubrication system for a dry sump internal combustion engine

1. An internal combustion engine mountable on a vehicle, the engine comprising:

a crankcase;

a crankshaft rotatably disposed within the crankcase;

a cylinder block connected to the crankcase;

a cylinder head assembly connected to the cylinder block;

a cylinder formed by the cylinder block and the cylinder head assembly;

a piston reciprocally mounted within the cylinder block and forming a variable volume combustion chamber therein, the piston being operatively connected to the crankshaft;

an intake port fluidly connected to the combustion chamber for allowing at least one combustion component to enter the combustion chamber;

an exhaust port fluidly connected to the combustion chamber for allowing spent combustion components to exit the combustion chamber; and

a dry sump lubrication system for lubricating the engine with oil,

the system including

an oil tank,

multiple oil paths through the engine, the multiple oil paths including

a first oil path, the first oil path including at least a portion of the cylinder head assembly,

a second oil path, the second oil path including at least a portion of the crankcase,

at least one pressure pump in fluid communication with the oil tank and the multiple oil paths for pumping oil from the oil tank through the multiple oil paths, and

at least one suction pump in fluid communication with the oil tank and the multiple oil paths for pumping oil to the oil tank from the multiple oil paths,

the system being constructed and arranged such that when the engine is mounted on the vehicle, and the vehicle is level and upright, and the engine is not in operation, oil in each of the multiple oil paths collects at one of a plurality of oil collection portions, each oil collection portion being at a low portion with respect to gravity in one of the respective multiple oil paths,

the system further including

a plurality of oil path drainage openings, at least one oil path drainage opening being fluidly connected to each oil collection portion allowing oil collected at the oil collection portion to be drained from the system;

an oil tank drainage opening fluidly connected to the oil tank to allow oil stored in the oil tank to be drained from the oil tank; and

a single drain plug simultaneously removeably sealing each of the oil path drainage openings and the oil tank drainage opening, such that substantially all of the oil in the system is drained from the system when the single drain plug is removed, the drain plug having a body having an outer surface and an end, the end sealing one of one of the oil path drainage openings and the oil tank drainage opening, the outer surface sealing a remainder of the oil path drainage openings and the oil tank drainage opening.

2. The internal combustion engine of claim 1 , wherein the multiple oil paths are two oil paths.

3. The internal combustion engine of claim 2 , wherein portions of the two oil paths overlap.

4. The internal combustion engine of claim 3 , wherein the at least one pressure pump is a single pressure pump and the at least one suction pump is two suction pumps: a first suction pump in fluid communication with the first oil path, a second suction pump in fluid communication with the second oil path.

5. The internal combustion engine of claim 1 , wherein portions of the multiple oil paths overlap.

6. The internal combustion engine of claim 1 , wherein the body of the drain plug seals one of the oil path drainage openings and the outer surface of the drain plug seals the remainder of the oil path drainage openings and the oil tank drainage opening.

7. The internal combustion engine of claim 6 , wherein the body of the drain plug seals the oil path drainage opening draining the first oil path and the outer surface of the drain plug seals the oil path drainage opening draining the second oil path and the oil tank drainage opening.

8. The internal combustion engine of claim 7 , wherein the at least one pressure pump is a single pressure pump.

9. The internal combustion engine of claim 8 , wherein the at least one suction pump is two suction pumps: a first suction pump in fluid communication with the first oil path, and a second suction pump in fluid communication with the second oil path.

10. The internal combustion engine of claim 1 , wherein the drain plug is located on a bottom portion of the engine.

11. The internal combustion engine of claim 10 , wherein

the oil collection portion of the second oil path is an oil chamber, the oil chamber being located at the bottom portion of the engine, below the crankshaft,

the first oil path includes a main oil gallery and the oil collection portion of the first oil path is located towards a lateral exterior from the oil chamber, and

the oil tank drainage opening is located at the bottom portion towards the lateral exterior from the oil collection portion of the first oil path.

12. The internal combustion engine of claim 11 , wherein

the dry sump lubrication system further includes an oil filter, and

when the engine is not in operation,

substantially all of the oil upstream of the pressure pump and downstream of the suction pumps is drainable through the oil tank drainage opening, and

substantially all of the oil upstream of the oil filter and downstream of the pressure pump is drainable through one of the plurality of oil path drainage openings.

13. The internal combustion engine of claim 1 , wherein the at least one pressure pump is a single pressure pump.

14. The internal combustion engine of claim 13 , wherein the at least one suction pump is two suction pumps: a first suction pump in fluid communication with the first oil path, and a second suction pump in fluid communication with the second oil path.

15. The internal combustion engine of claim 1 , wherein the end seals one of the oil path drainage openings and the oil tank drainage opening, and the outer surface seals a remainder of the oil path drainage openings and the oil tank drainage opening.

16. The internal combustion engine of claim 1 , wherein

the oil collection portion of the second oil path is an oil chamber, the oil chamber being located at the bottom portion of the engine, below the crankshaft,

the first oil path includes a main oil gallery and the oil collection portion of the first oil path is located towards a lateral exterior from the oil chamber, and

the oil tank drainage opening is located at the bottom portion towards the lateral exterior from the oil collection portion of the first oil path.

17. The internal combustion engine of claim 1 , wherein

the dry sump lubrication system further includes an oil filter, and

when the engine is not in operation,

substantially all of the oil upstream of the pressure pump and downstream of the suction pumps is drainable through the oil tank drainage opening, and

substantially all of the oil upstream of the oil filter and downstream of the pressure pump is drainable through one of the plurality of oil path drainage openings.

18. The internal combustion engine of claim 1 , wherein the engine operates on a 4-cycle principle.