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A six-cylinder, four-stroke SI engine delivers 400 b.h.p. at 2,400 r.p.m. Determine the bore and stroke from the following data:

         Compression ratio = 6; stroke to bore ratio = 1.25, IMEP = 10 kgf / cm2, relative efficiency = 0.5, mechanical efficiency = 0.8, and calorific value of fuel = 10, 500 k cal/kg.  What is the brake specific fuel consumption?  Assume $\gamma$ for air as 1.4.

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