12. Find the bore and stroke in inches of a six-cylinder four-stroke-cycle gasoline engine which delivers 120 bhp at an

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12 Find The Bore And Stroke In Inches Of A Six Cylinder Four Stroke Cycle Gasoline Engine Which Delivers 120 Bhp At An 1 (24.76 KiB) Viewed 51 times

12. Find the bore and stroke in inches of a six-cylinder four-stroke-cycle gasoline engine which delivers 120 bhp at an average piston speed of 2500 fpm. Assume: volumetric efficiency, 85 per cent; mechanical efficiency, 80 per cent; gasoline, 20,000 Btu per lb; theoretical air-fuel ratio, 15.0 lb per lb; excess air, 20 per cent; brake thermal efficiency, 23 per cent; stroke-bore ratio, 1:1; gasoline vapor twice as heavy as air; air and gasoline vapor at 14 psia and 180 F at end of suction stroke. 4.47 in., Ans.