. Influence of valve setting on efficiency and capacity of a 25 horse power International Harvester Company gasoline engine. tic valve regard-ing the closing point. To effect a closing at 35° pastlower dead center, the cams v/hich operate the intakevalves were shifted the required amount. To do this,the keys were removed and the cams were shifted 6 and4° for the left and right cylinders respectively. Itwas found that the 5/8 inch set screws which the build-ers had inserted to prevent side slip were sufficientto hold the cams in place for the short tine 18 shows the method of sh
. Influence of valve setting on efficiency and capacity of a 25 horse power International Harvester Company gasoline engine. tic valve regard-ing the closing point. To effect a closing at 35° pastlower dead center, the cams v/hich operate the intakevalves were shifted the required amount. To do this,the keys were removed and the cams were shifted 6 and4° for the left and right cylinders respectively. Itwas found that the 5/8 inch set screws which the build-ers had inserted to prevent side slip were sufficientto hold the cams in place for the short tine 18 shows the method of shifting the cams, A-55- representing the number of degrees that the corns wereshifted, FigB, 19 ajid 20 show the timing of the valvesafter shifting the cams. The following data, curvesand indicator cards are the results of a test madeunder these conditions. _-60- PART II. The Efficiency and Capacity of a 25 Horse RbwerInternational Harvester Company Gasoline Engine afterchanging the relative positions of the cams of the intakevalves and their cam shaft -61- Figure showing shifting of cam upon cam shaft,-62-. Figure 19, Timing diagrsim of right cylinder after shiftingthe cams. -63- Figure 20, Tiding diagram of left cylinder after shiftingthe caos. Test Number 3, April 20, 1914,, Victor 2 Cylinder, 4 Cycle Gasolie Horse Power 25, at 335 ,Size of cylinders, 8 x 10,Barometer = Weight of Strut aad Brake Arm —21,7 —° Beaume,Heat Value of Gasoline per lb. = 18650 -f-40 ( 58,85 - 10) - 18650 -f-1955 - 20605 «65- DATA - TEST # 3, Number of tvm 10 10 10 Duration of run Gasoline per run lbs. 2,56 2,46 Gasoline per hour lbs, 16,32 15,36 14,76 Total heat supplied / hour I BTU. 336800 316700 304200 Jacket water per hour 1327 1471 Temp, jacket water iiilet 46,5 46,5 46,3 outlet 169,5 Revolutions per minute 387,5 380,5 Explosions per minute « , h Prdfesure lbs, per sq. in, abs, left cylinde
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