48 BULLETIN 119, U. S. NATIOls^AL MUSEUM. 



valves being of the poppet type operated by a cam shaft geared to 

 the crank shaft. The oiling system is splash and gravity feed to 

 the main bearings and idler gear and also a constant feed to the oil 

 basins in the crank case. An oil pump of the plunger type operated 

 by an eccentric on the cam shaft circulates the oil. The motor is 

 equipped with the Leece-Neville electric starting and lighting sys- 

 tem, composed of a generator, motor, storage battery, and starting 

 control, operated through the clutch pedal. It is also fitted with 

 the Vulcan electric gear shift, operated by a push-button switch. 

 The buttons control the operation of a set of electromagnets, one 

 for each of the three forward speeds and one for the reverse. To 

 the clutch pedal is connected a mechanical neutral device and a small 

 mechanical master switch which completes the circuit to the storage 

 battery for energizing the electromagnets. Ignition is obtained 

 through a high-tension magneto geared to the crank shaft. The 

 carbureter is of the Stromberg make, whose inlet manifold is 1^ 

 inches in diameter. The gasoline feed is under pressure supplied 

 by a hand pump and mechanical air pump on the motor. The 

 cooling water is circulated by a centrifugal pump geared to the 

 crank shaft. Weight is 1,000 pounds, horsepower 65. 



Cat. No. 283,279 U.S.N.M. 



Single-Cylinder Unit of Sleeve-Valve Gasoline Engine, 1921. Sectioned 

 and Hand Operated. Gift of Willys-Overland Co., Toledo, Ohio. 



The particular feature of this engine is that the regulation of both 

 the intake of gasoline vapors and the exhaust of the products of 

 (combustion are obtained by sliding sleeve valves — two cylindrical 

 sleeves which glide silently up and down between the cylinder wall 

 and the piston, one working within the other. Slotted openings in 

 these sleeves register with each other and with the cylinder ports at 

 the proper intervals, forming large passages for the intake and 

 exhaust gases. In practically all other respects the engine has much 

 in common with the generally used poppet-valve type of engine. 



Each sleeve is raised and lowered by a connecting rod from an 

 eccentric shaft which, in turn, is operated on the same principle as 

 a cam shaft in a poppet-valve engine. 



The engine is of the four-cycle type, that is, the piston makes four 

 strokes — two up and two down — for every explosion that takes place. 

 These strokes in order and operation are : 



1. Intake.— During the first downward stroke of the piston the two 

 sleeve-valve openings on the carbureter side, come opposite each other 

 and at the same time opposite the opening in the intake manifold. 

 Through this unobstructed opening gasoline vapor is drawn into the 

 combustion chamber. 



