THEORIES OF OPERATION
The mechanical governor, Fig. 35, works in a similar
manner except that instead of the force of the air blowing
against the vane, we have the centrifugal force of flyball
weights opposing the governor spring.
In either case, operation is the same. As the load on the
engine increases, the engine will start to slow down. As
soon as this happens, the centrifugal force of the flyball
weights lessens. This allows the governor spring to pull
the throttle open wider increasing the horsepower to
compensate for the increased load and thus maintain the
desired governed speed.
If the load on the engine lessens, the engine starts to
speed up. This will increase the pressure of the
centrifugal force and the spring will be stretched a little
farther thus closing the throttle and reducing the engine
power. A properly functioning governor will maintain this
desired governed speed within fairly close limits.
In general, an engine that has good compression,
However, dirt or neglect can ruin an engine quickly. It
should be the duty, therefore, of every salesman or
repair man to instruct the customer in the proper
operation and care of the engine so that he will obtain
the long service life that is built into the engine at the