Scavenging insert for an engine

1. An internal combustion engine, comprising:

a cylinder chamber having a cylindrically hollow portion disposed therein;

a piston slidably engaged with the cylindrically hollow portion;

a crankcase in fluidic communication with the cylinder chamber;

at least one scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase, wherein the scavenging insert provides at least a segment of the cylindrically hollow portion and wherein the scavenging conduit insert is retained by a main crankshaft bearing.

2. The internal combustion engine of claim 1 , wherein the cylindrically hollow portion comprises a surface, and wherein the scavenging insert provides at least a segment of the surface.

3. The internal combustion engine of claim 1 , wherein the scavenging insert is circumferentially discontinuous.

4. The internal combustion engine of claim 1 , wherein each scavenging conduit insert provides at least one port for the communication between the cylinder chamber and the crankcase.

5. The internal combustion engine of claim 1 , wherein the scavenging insert provides at least a segment of the surface against which the piston is slidably engaged.

6. The internal combustion engine of claim 1 , wherein the scavenging insert is made of a material different than that of the cylinder chamber.

7. The internal combustion engine of claim 1 , wherein the scavenging insert is circumferentially continuous.

8. A scavenging conduit insert for an internal combustion engine, wherein the scavenging conduit insert comprises:

a body portion;

a first flange portion engaged with a first end of the body portion; and

a second flange portion engaged with a second end of the body portion, wherein the first arm and the second arm are in a spaced apart relationship and wherein the scavenging conduit insert is retained by a main crankshaft bearing.

9. The scavenging conduit insert of claim 8 , wherein the scavenging conduit insert provides at least one port for communication between a cylinder chamber and a crankcase.

10. The scavenging conduit insert of claim 8 further comprising at least one projection extending from the body portion for providing a plurality of ports for communication between a cylinder chamber and a crankcase.

11. The scavenging conduit insert of claim 8 , wherein the first flange, second flange, and body portion cooperate to form at least one aperture.

12. A scavenging conduit insert for an internal combustion engine, wherein the scavenging conduit insert comprises:

a body portion;

a first flange portion engaged with a first end of the body portion;

a second flange portion engaged with a second end of the body portion, wherein the first arm and the second arm are in a spaced apart relationship; and

at least one projection extending from the body portion for providing a plurality of ports for communication between a cylinder chamber and a crankcase.

13. The scavenging conduit insert of claim 12 , wherein the first flange, second flange, and body portion cooperate to form at least one aperture.

14. A method of making a two-stroke engine, the method comprising the steps of:

utilizing a pressure die casting process to make the cylinder chamber of said engine with a scavenging conduit open to the interior space of said cylinder chamber;

inserting at least one scavenging conduit insert between said interior and said scavenging conduit; and

retaining said scavenging conduit insert by mating a main crankshaft bearing thereto.

15. The method of claim 14 , wherein said engine includes a cylinder chamber having a cylindrically hollow portion disposed therein; a piston slidably engaged with the cylindrically hollow portion; a crankcase in fluidic communication with the cylinder chamber; and said scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase, wherein the scavenging insert provides at least a segment of the cylindrically hollow portion.

16. An internal combustion engine comprising:

a cylinder chamber having a cylindrically hollow portion disposed therein;

a piston slidably engaged with the cylindrically hollow portion;

a crankcase in fluidic communication with the cylinder chamber; and

at least one scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase, wherein the scavenging insert provides at least a segment of the cylindrically hollow portion, and the scavenging insert extends to provide a portion of a conduit opening into the cylinder chamber and a portion of a conduit opening into the crankcase.