In an ideal diesel cycle, the temperatures at the beginning and at the end of compression are \(57^{\circ} \mathrm{C}\) and \(603^{\circ} \mathrm{C}\), respectively. The temperatures at the beginning and at the end of expansion are \(1959^{\circ} \mathrm{C}\) and \(870^{\circ} \mathrm{C}\), respectively. Determine the ideal efficiency of the cycle if the pressure at the beginning is 1 bar. Calculate maximum pressure in the cycle.