. Efficiency test of a four cylinder four cycle twenty horse power automobile gasoline engine. f5 ^0 fS/ . . Izv r>.^ « - r > ? • . J i- ^^ snc •-^taoQ T ? **? * K* - »• r-T. w J. i. of the Y supplies two cj-linders. The burned gasesexhaust into one pipe, and pass through a long leadto the roof of the building. The valve setting with which all runs for thisthesis were made, is tabulated and the crank posi~tions are shown on the blue prints. Cylinder No. 1,Inlet valve. S^diaust ° late. 37.^75* ° late. Cylinder Ko, valve. Exhaust valv
. Efficiency test of a four cylinder four cycle twenty horse power automobile gasoline engine. f5 ^0 fS/ . . Izv r>.^ « - r > ? • . J i- ^^ snc •-^taoQ T ? **? * K* - »• r-T. w J. i. of the Y supplies two cj-linders. The burned gasesexhaust into one pipe, and pass through a long leadto the roof of the building. The valve setting with which all runs for thisthesis were made, is tabulated and the crank posi~tions are shown on the blue prints. Cylinder No. 1,Inlet valve. S^diaust ° late. 37.^75* ° late. Cylinder Ko, valve. Exhaust ° late, * late. Cylinder No. valve. Exhaust ** late. early. Closes, ° ° late. Cylinder No. valve. Exhaust late, ** early. Closes. ° ° late. r^ -? ; J,:->?... ^, « r r ?. -. -r .1^ :?;•: - . V isin r*^ - r ;r :r.,xr-^ «^ f - I . *? - *^ Ik *~ r I **, * » , - ?? r. 7 ii- .*•? n^ •* -,,r- f ? < •. ^t Lubrication. The engine is fitted with a complete system oflubrication. An eight point, force feed, McCordlubricator Is operated by a small belt from the crankshaft of the engine. This lubricator forces the oil through coppertubes to eight points on the engine. This dlstri*bution is one to each eylinder, one to each camshaft bearing, and one to the center bearing of thecrank shaft. The end bearings of the crank shaft arelubricated by grease cups, screwed into the casting. Further lubrication is had by filling the crankcase with oil to such a level, that the ends of theconnecting rods hit the oil surface, and splash itover the bearings and lower part of the cylinders. Mixing Valve. The engine is fitted with a Lunkenhelmer mixingvalve, instead of a carburetor ordinarily used onautomobile engines. This method of vaporization wasfound to be more efficient for such a test, than theuse of a carburetor. :i^- zo ©fli ffi
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