The 7-horsepower engine (fig. 60), with four separately 

 cast cylinders, has a bore of 314 inches and a stroke of 3'A 

 inches, and is equipped with integral horizontal cooling 

 fins about one-sixteenth of an inch thick spaced three- 

 eighths of an inch apart. The crankcase is of ferrous ma- 

 terial and has a large, rectangular access cover at the front. 

 The flywheel and hand crank are on the right end of the 

 crankshaft. 



The intake manifold on the rear side of the engine is 

 mounted transversely, with the vertical riser containing the 

 throttle valve at its center (fig. 61). The four exhaust 

 pipes in front of the cylinders drop to a manifold, which 

 connects to a pipe leading back to the muffler. There is 

 one automatic, overhead intake valve and one pushrod- 

 operated, overhead exhaust valve in each cylinder. Each 

 of the four push rods passes through the horizontal portion 

 of its exhaust pipe. 



Figure 61. — Carburetor and throttle valve of 1902 Franklin. 



83 



