In an air-standard Otto cycle, air is supplied at 0.1MPa and 308 K. The ratio of the specific heats (g) and the specific gas constant (R) or air are 1.4 and 288.8 J/kg.K, respectively. If the compression ratio is 8 and the maximum temperature in the cycle is 2660 K, the heat (in kJ/kg) supplied to the engine is ______________