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.