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A turbo-charged internal combustion cylinder assembly includes a combustion chamber, an intake port communicably connected with an intake manifold, and an exhaust port communicably connected with an exhaust manifold. An intake valve is disposed within the intake port, and an exhaust valve is dispose

A turbo-charged internal combustion cylinder assembly includes a combustion chamber, an intake port communicably connected with an intake manifold, and an exhaust port communicably connected with an exhaust manifold. An intake valve is disposed within the intake port, and an exhaust valve is disposed within the exhaust port, the valves facilitating, in an open position, or restricting, in a closed position, gas flow between their respective ports and the combustion chamber. A compressor may be communicably connected to the intake manifold so as to provide pre-combustion gases to, and regulate pressure of the combustion chamber. The exhaust valve may open while the intake valve is closed to exhaust post-combustion gases from the combustion chamber. Alternatively, the exhaust valve may open while the intake valve is open to admit post-combustion gases into the combustion chamber if the combustion chamber pressure is lower than the exhaust port pressure.

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1. A turbo-charged internal combustion cylinder assembly comprising:a cylinder having a cylinder head at an end thereof, and a combustion chamber disposed in said cylinder head;an intake port disposed in said cylinder head, an intake valve movably disposed in said intake port, said combustion chambe

1. A turbo-charged internal combustion cylinder assembly comprising:a cylinder having a cylinder head at an end thereof, and a combustion chamber disposed in said cylinder head;an intake port disposed in said cylinder head, an intake valve movably disposed in said intake port, said combustion chamber communicably connected to a compressor via said intake port, said compressor providing pre-combustion gases to said combustion chamber when said intake valve is open;an exhaust port disposed in said cylinder head, an exhaust valve movably disposed in said exhaust port, said combustion chamber communicably connected to an exhaust manifold via said exhaust port;wherein said exhaust valve opens to exhaust post-combustion gases to said exhaust manifold while said intake valve is substantially closed; andwherein said exhaust valve opens to admit post-combustion gases to said combustion chamber while said intake valve is substantially open; anda fuel injector disposed in said cylinder head to admit fuel to said combustion chamber, said fuel injector comprising further a pump chamber, a fuel-injecting plunger for reciprocating within said pump chamber, and a discharge nozzle connected to said pump chamber for injecting fuel into said combustion chamber; anda spill valve positioned between said pump chamber and said discharge nozzle for controlling a rate of fuel injection to said combustion chamber, said spill valve having a first position providing a maximum fuel injection rate, a second position providing a substantially zero fuel injection rate, and at least one intermediate position providing an intermediate fuel injection rate between said maximum fuel injection rate and said zero fuel injection rate. 2. The turbo-charged internal combustion cylinder assembly of claim 1, comprising further first and second exhaust cam lobes operably disposed to open said exhaust valve;wherein said first cam lobe opens said exhaust valve to exhaust post-combustion gases to said exhaust manifold while said intake valve is substantially closed; andsaid second cam lobe opens said exhaust valve to admit post-combustion gases to said combustion chamber while said intake valve is substantially open. 3. The turbo-charged internal combustion cylinder assembly of claim 1, wherein said turbo-charger comprises a clutch-driven compressor. 4. The turbo-charged internal combustion cylinder assembly of claim 1, comprising further an aftercooler to cool said pre-combustion gases. 5. The turbo-charged internal combustion cylinder assembly of claim 4, comprising further a shutoff valve between said compressor and said aftercooler to reduce a flow of said pre-combustion gases. 6. The turbo-charged internal combustion cylinder assembly of claim 1, comprising further a shutoff valve between said compressor and said combustion chamber to reduce a flow of said pre-combustion gases. 7. The turbo-charged internal combustion cylinder assembly of claim 1, comprising further a bypass valve to bypass said compressor to reduce a flow of said pre-combustion gases. 8. The turbo-charged internal combustion cylinder assembly of claim 1, comprising further an electric motor to assist said compressor. 9. The turbo-charged internal combustion cylinder assembly of claim 1, wherein said compressor is selected from the group consisting of:a fixed-geometry compressor,a variable-geometry compressor,an electrically-assisted compressor, anda low inertia compressor. 10. The turbo-charged internal combustion cylinder assembly of claim 1, wherein said turbo-charger comprises further:a waste gate. 11. The turbo-charged internal combustion cylinder assembly of claim 1, wherein said turbo-charger comprises further:an 87 mm diameter compressor; anda 76 mm diameter turbine. 12. A turbo-charged internal combustion engine comprising:a plurality of cylinders, each of said cylinders comprising:a cylinder head fixedly disposed at an end of said cylinder, and a combustion chamber disposed in said cylinder head;an intake port disposed in said cylinder head, an intake valve movably disposed in said intake port, said combustion chamber communicably connected to a compressor via said intake port, said compressor providing pre-combustion gases to said combustion chamber when said intake valve is open;an exhaust port disposed in said cylinder head, an exhaust valve movably disposed in said exhaust port, said combustion chamber communicably connected to an exhaust manifold via said exhaust port;wherein one of said exhaust valves opens to exhaust post-combustion gases to said exhaust manifold while a corresponding one of said intake valves is substantially closed; andwherein one of said exhaust valves opens to admit post-combustion gases to said combustion chamber while one of said intake valves is substantially open; anda fuel injector disposed in said cylinder head to admit fuel to said corresponding combustion chamber, said fuel injector comprising further a pump chamber, a fuel-injecting plunger for reciprocating within said pump chamber, and a discharge nozzle connected to said pump chamber for injecting fuel into said combustion chamber; anda spill valve positioned between said chamber and said nozzle for controlling a rate of fuel injection to said combustion chamber, said spill valve having a first position providing a maximum fuel injection rate, a second position providing a substantially zero fuel injection rate, and at least one intermediate position providing an intermediate fuel injection rate between said maximum fuel injection rate and said zero fuel injection rate. 13. The turbo-charged internal combustion engine of claim 12, wherein said plurality of cylinders is six. 14. The turbo-charged internal combustion engine of claim 13, wherein said compressor comprises a first and a second compressors;said six cylinders are comprised of a first three cylinders and a second three cylinders; andwherein said first compressor communicates substantially exclusively with said first three cylinders and said second compressor communicates substantially exclusively with said second three cylinders. 15. A tractor comprising:a turbo-charged internal combustion engine, said engine comprising:a plurality of cylinders, each of said cylinders comprising:a cylinder head fixedly disposed at an end of said cylinder, and a combustion chamber disposed in said cylinder head;an intake port disposed in said cylinder head, an intake valve movably disposed in said intake port, said combustion chamber communicably connected to a compressor via said intake port, said compressor providing pre-combustion gases to said combustion chamber when said intake valve is open;an exhaust port disposed in said cylinder head, an exhaust valve movably disposed in said exhaust port, said combustion chamber communicably connected to an exhaust manifold via said exhaust port;wherein one of said exhaust valves opens to exhaust post-combustion gases to said exhaust manifold while a corresponding one of said intake valves is substantially closed; andwherein one of said exhaust valves opens to admit post-combustion gases to said combustion chamber while one of said intake valves is substantially open; anda fuel injector disposed in said cylinder head to admit fuel to said corresponding combustion chamber, said fuel injector comprising further a pump chamber, a fuel-injecting plunger for reciprocating within said pump chamber, and a discharge nozzle connected to said pump chamber for injecting fuel into said combustion chamber; anda spill valve positioned between said chamber and said nozzle for controlling a rate of fuel injection to said combustion chamber, said spill valve having a first position providing a maximum fuel injection rate, a second position providing a substantially zero fuel injection rate, and at least one intermediate position providing an intermediate fuel injection rate between said maximum fuel injection rate and said zero fuel injection rate.