A four-stroke engine has a total displacement volume of 10L, 125mm bore and 16.3:1 compression ratio. The engine produces a maximum of 210 kW at 2100 RPM. The intake air is at 45 degrees C and 22.5 g/s of air flow into each cylinder. Calculate the volume in each cylinder when the piston reaches TDC. Identify a factor that reduces volumetric efficiency at high engine speeds.