. Automotive industries . 800 bOO z ONE PLUG TWO PLUGS Q. m 400 In iTONATI ON 1 » z a. • a 200 y/y2i / IGNITION IGNITION EFFECT OF SPARK ADVANCE ANDNUMBER OF PLUGS ON PRESSURESIN CYLINDER OF AIRPLANE ENGINE —5 IN BORE . 7 IN. STROKE1IOO 10 12 ADVANCE (INCHES BEFORE TOP CENTER) Fig. 1 .8 0 .2 4 .6STROKE IN INCHES Fig. 2 > .8 0 .2 4 STROKE IN INCHES Fig. 3 Curves showing effect of spark advance and number of sparks on maximum pressure, detonation and poweroutput of a single-cylinder Liberty engine This method is one of the most valuable means of i
. Automotive industries . 800 bOO z ONE PLUG TWO PLUGS Q. m 400 In iTONATI ON 1 » z a. • a 200 y/y2i / IGNITION IGNITION EFFECT OF SPARK ADVANCE ANDNUMBER OF PLUGS ON PRESSURESIN CYLINDER OF AIRPLANE ENGINE —5 IN BORE . 7 IN. STROKE1IOO 10 12 ADVANCE (INCHES BEFORE TOP CENTER) Fig. 1 .8 0 .2 4 .6STROKE IN INCHES Fig. 2 > .8 0 .2 4 STROKE IN INCHES Fig. 3 Curves showing effect of spark advance and number of sparks on maximum pressure, detonation and poweroutput of a single-cylinder Liberty engine This method is one of the most valuable means of iden-tifying the source of crude from which lubricating oilsare derived, as there is a marked difference in the boilingpoints and the yields of distillate obtained between paraf-fin and naphthene base oils. Engine Tests of Hydrocarbon Lubricants It is the purpose of the Bureau to test numerous dif-ferent oils on the market before and after use for con-siderable period in automotive engines. In order to dothis engines are run under constant test conditions andchange in the character of the lubricant noted by col-lecting representative samples at various stated inter-vals during the test. The lack of personnel has preventedcompletion of many tests of this char
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
