Opposed piston engine and elements thereof

1. A four-stroke opposed piston engine comprising:

a first cylinder containing a first piston, and, a second piston opposing the first piston;

a second cylinder containing a third piston, and, a fourth piston opposing the third piston;

a first piston face configured on the first piston, and, a second piston face configured on the second piston, said first and second pistons each—comprising respective first annular regions, said first annular regions defining a first combustion chamber that determines the compression and combustion efficiency within the chamber the when said first and second pistons are at top dead center;

a third piston face configured on the third piston, and, a fourth piston face configured on the fourth piston, said third and fourth pistons each comprising respective second annular regions, said second annular regions defining a second combustion chamber that determines the compression and combustion efficiency of the second chamber when said third and fourth pistons are at top dead center;

a first crank shaft operably communicating with said first and third pistons; and

a second crank shaft operably communicating with said second and fourth pistons;

a drive train operably communicating with said first and second crank shafts and comprising a first crank shaft gear connected to said first crank shaft, a second crank shaft gear connected to said second crank shaft, a first synchro gear rotatably communicating with said first crank shaft gear, and a second synchro gear rotatably communicating with said second crank shaft gear, wherein (a) said first synchro gear, said first and second crank shaft gears are equal in diameter (b) said first and second synchro gears are equal in diameter, and (c) the diameter of said first and second synchro clears is twice the diameter of said first and second crank shaft gears, and

wherein each combustion chamber of said first annular regions and said second annular regions, respectively, comprise a plurality of detents or depressions to receive operating valves at top dead center to allow for proper intake and evacuation of gases from a respective cylinder.

2. The engine of claim 1 wherein said first, second, third, and/or fourth piston faces are toroidal in shape.

3. The engine of claim 1 wherein said first, second, third, and/or fourth piston faces are flat-faced with side cavities.

4. The engine of claim 1 wherein said first, second, third, and/or fourth piston faces are full dome-faced.

5. The engine of claim 1 wherein said first, second, third, and/or fourth piston faces are half dome-faced.

6. The engine of claim 1 wherein said first, second, third, and/or fourth piston faces are radius dome-faced.

7. The engine of claim 1 , further comprising at least one first spark plug partially within said first combustion chamber and at least one second spark plug partially within said second combustion chamber.

8. A four-stroke opposed piston engine comprising:

a first cylinder containing a first piston, and, a second piston opposing the first piston;

a second cylinder containing a third piston, and, a fourth piston opposing the third piston;

a first crank shaft operably communicating with said first and third pistons;

a second crank shaft operably communicating with said second and fourth pistons;

a drive train comprising (i) a first driver operably communicating with said first crank shaft, a second driver operably communicating with said second crank shaft, a third driver operably communicating with said first driver, and, a fourth driver communicating with said second driver, said third and fourth drivers each having a diameter twice that of said first and second drivers, (ii) a first crank shaft gear connected to said first crank shaft, a second crank shaft gear connected to said second crank shaft, a first synchro gear rotatably communicating with said first crank shaft clear, and a second synchro clear rotatably communicating with said second crank shaft gear and said first synchro gear, where (a) said first and second crank shaft gears are equal in diameter, and, (b) said first and second synchro gears are equal in diameter and (c) twice the diameter of the first and second crank shaft gears;

a first piston face located on the first piston, and, a second piston face located on the second piston, said first and second pistons each comprising respective first annular regions, said first annular regions defining a first combustion chamber wherein each combustion chamber of said first annular regions comprise a plurality of detents or depressions to receive operating valves at top dead center to allow for proper intake and evacuation of gases from a respective cylinder; and

a third piston face located on the third piston, and, a fourth piston face located on the fourth piston, said third and fourth pistons each comprising respective second annular regions, said second annular regions defining a second combustion chamber wherein each combustion chamber of said second annular regions comprise a plurality of detents or depressions to receive operating valves at top dead center to allow for proper intake and evacuation of gases from a respective cylinder.

9. The engine of claim 8 , further comprising at least one first spark plug partially within said first combustion chamber and at least one second spark plug partially within said second combustion chamber.

10. A four-stroke opposed piston engine comprising:

a plurality of cylinders, each cylinder containing a first piston and a second piston opposing the first piston;

a first piston face configured on each first piston, and, a second piston face configured on each second piston, each of said first and second pistons further comprising respective first annular regions, each first annular region defining a respective combustion chamber that determines the compression and combustion efficiency within the chamber when said respective first and second pistons are at top dead center;

a first crank shaft operably communicating with one or more of the first pistons;

a second crank shaft operably communicating with one or more of the second pistons; and

a drive train comprising (i) a first driver operably communicating with said first crank shaft, a second driver operably communicating with said second crank shaft, a third driver operably communicating with said first driver, and, a fourth driver communicating with said second driver, said third and fourth drivers each having a diameter twice that of said first and second drivers, and (ii) a first crank shaft gear connected to said first crank shaft, a second crank shaft clear connected to said second crank shaft, a first synchro gear rotatably communicating with said first crank shaft gear, and a second synchro gear rotatably communicating with said second crank shaft gear, wherein (a) said first synchro gear, said first and second crank shaft pears are equal in diameter, and (b) said first and second synchro gears are equal in diameter and have a diameter twice that of said first and second crank shaft gears;

wherein each combustion chamber of each first annular region comprises a plurality of detents or depressions to receive operating valves at top dead center to allow for proper intake and evacuation of gases from a respective cylinder.

11. The engine of claim 10 , further comprising at least one first spark plug partially within each respective combustion chamber.