Over Head Valve

above is an image the machine using the mechanism of valve OHV
(Over Head Valve), and one is a camshaft drive which consists of
other timing chain and timing gear direct use. machine with such
a mechanism is usually much found on a machine that still uses a
carburetor fuel system and still use a connecting push rod to
move the trigger valve (rocker arm).
The mechanical flow of OHV is as shown in Figure 2.




System like this is not efective, because so many using
mechanical circuit to open and close the valve so that
generated a lot of grit on a power loss working machine.
Not only is the resulting loss in engine friction, such
a system It also can not achieve the high rpm because the
level accuracy of the lid Valve (valve) is very small which
also caused by amount cavities of the valve drive starts
to crank Saft valve.

See more about Overhead Camshaft dan Automatic Transmision Clutch

Automatic Transmision Torque Converter

Here is a picture of the torque converter in the automatic Transmission or it could be called a clutch automatic transmission, which serves as an intermediary for the torque from the engine to the transmission.
canverter torque is usually patented or can not be repaired or opened as shown in the picture, if there is damage. basic principle of the coupling can we be compared to the second image



At the time of fan A and fan B line of sight, B fan will rotate in the same direction with a fan even though conditions in the switch off. but if it was given a room to reverse the flow of the fan the fan B to A (as shown in Figure 3).



Then the energy left in the air after the fan B will again assist the fan A fan movement, so that will happen on the engine torque multiplication of this system are forwarded to the tranmission.

so actually Automatic Transmission effesiensi have a very good level when compared with manual Transmission, and can even be double the torque of the engine, not to mention added to the planetary gear system found on the transmission also has a very good level of efficiency. but it's just my opinion only ..