Eliminating Automobile Valve Trouble 



Valves made of pure carbon are self-lubricating 



ALL valve grinding, trouble with weak 

 r\ valve springs and loss of power 

 through improper seating of valves 

 would be eliminated if the motors were 

 fitted with the 

 carbon rotary 

 valve shown in 

 the accompany- 

 ing illustrations. 

 It is made of 

 pure carbon in 

 the shape of a 

 cone with the 

 apex cut off and 

 is run small end 

 down in a steel 

 seat placed be- 

 tween the cur\-- 

 ature of two or 

 more adjacent 

 cylinders. It is 

 carried on a ver- 

 tical shaft re- 

 volved by a pair 

 of bevel gears 

 driven off the en- 

 gine crank-shaft. 

 Two Boston men 

 are the inventors. 



Carbon is one of 

 the best lubricants 

 known and has 

 great heat resisting 

 properties, so that the 

 valve is practically 

 self-lubricated and is 

 yet able to withstand 

 the heat of the ex- 

 haust gases without 

 warping and sticking 

 in its seat, a trouble 

 heretofore always ex- 

 perienced to some ex- 

 tent with metal- 

 against-metal rotar\' 

 valves. 



The illustration 

 shows a four-cylinder 

 motor with its cylin- 

 ders cast in pairs and 

 a valve for each pair. 



A four-cylinder motor with 

 the cylinders cast in pairs. 

 There is a valve for each pair 



The two rectangular intake 

 and exhaust ports in the 

 ciiTved sides of the valve 



Exhaust 

 port 



Exhaust 

 manifold 



From 

 carbwreter 



Squared valve 

 stern 



A cross-sectional view showing the 

 construction of the valves and their 

 relation to the engine cylinder 



As shown in the draw 

 ings, the valve has two rectangular ports 

 cut in its curved sides at points 20 degrees 

 apart. A passageway is cut from one of 



these ports to the large top of the valve. 

 A similar passage is cut from the other port 

 to the bottom of the valve, the passages 

 being on the same side of the valve as the 



port in each 

 case. The open- 

 ing in the top 

 serves as the ex- 

 haust port and 

 that in the bot- 

 tom as the in- 

 take port. 



At the begin- 

 ning and during 

 the suction 

 stroke of the 

 motor, the valve 

 is rotated in its 

 seat so that the 

 intake port in 

 the \- a 1 V e is 

 made to coin- 

 cide with the 

 jx)rt in the valve 

 seat which 

 opens into a pas- 

 sage leading di- 

 rectly into the 

 head of the 

 cylinder. The 

 gas passes up 

 through the 

 crescent -shaped 

 opening in the 

 bottom of the 

 valv'e, through the coin- 

 ciding ports in valve and 

 seat and thence through 

 the passage leading to the 

 cylinder where it is ex- 

 ploded in the usual man- 

 ner. Then as the valve 

 is rotated at half the 

 sj>eed of the motor, the 

 latter has its compression 

 and firing strokes before 

 the valve has made one- 

 half a revolution and the 

 exhaust port of the latter 

 is brought opposite the 

 valve seat port to permit 

 the burnt gases to pass 

 through the valve and up into the exhaust 

 manifold. The following half revolution of 

 the v'alve takes care of the second cylinder. 



845 



