GAS ENGINES 



517 



■Deod 'center 



i.c.e-5 



governors: the hit-or-miss and the throttling. The hit-or- 

 niiss governor is used on small stationary engines where the 

 load demands have a wide variation. Such an engine has 

 a very heavy fly- 

 wheel, which is not 

 a good characteris- 

 tic of an engine to 

 be used in self-pro- 

 pelling vehicles. 

 The governor oper- 

 ates by holding the 

 exhaust valve open, 

 by holding the in- 

 take valve closed, 

 or by holding the 

 exhaust valve closed 

 and withholding the 

 spark. The first and third methods are most common. 

 The throttling governor has increased in popularity with 



C-3 4 



Ex 0. 2-5 



1.0.-3-4 

 EX C -3-4 



C.-/-6 



EX C-2-5' 

 10.- a- 5' 

 EX 0.-I-6' 



Pig. 414. The flywheel markings as they 



would be found on a six-cylinder four-cycle 



automobile or tractor engine on dead center 



U Ex/rai/j/ 



Baffle- 



Fig. 415. 



-J&eJo'c/fff years 

 The most common design used in two-cycle and four-cycle engines 



