Problem 5 on IC engine, Engine capacity or Cubic capacity, four stroke engine

Single cylinder , 4 stroke gas fuelled engine delivers a brake Power of 20 kW at 6000 rpm.
air-gas ratio 8:1
calorific value of fuel = 11MJ/m^3
compression ratio = 8:1
volumetric efficiency 70%
indicated thermal efficiency 33%
mechanical efficiency 90%
Calculate engine capacity of the engine.
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