To calculate the total air displacement of the engine, you can use the formula for the volume of a cylinder: V=X() x Where: V is the volume, TT is the mathematical constant (approximately 3.14), d is the bore diameter, h is the stroke. Let's calculate the volume for one cylinder first: Veylinder = (73 mm) 2 89.4 mm Now, since there are four cylinders in total for the engine, the total air displacement ( Vtotal) is: Votal 4x Veylinder Let's plug in the values and calculate: Veylinder = 3.14 (73 mm) 2 89.4 mm : Veylinder 3.14x (3.5mm) 2 x 89.4 mm Verlinder 3.14 x 18.252 x 89.4 mm Veylinder 3.14 x 333.0625 x 89.4 mm Veylinder 3.14 x 29721.25 mm Veylinder 93342.15 mm Now, for the total air displacement: Vtotal 4 x 93342.15 mm Votal 373368.6 mm Now, for the bonus point, we need to convert this volume from cubic millimeters to liters. Since 1L = 1, 000, 000 mm, the conversion is: Vtotal (L) 373368.6 mm 1,000,000 Vtotal (L) 0.3734 L L So, the engine's total air displacement is approximately 373.4 L, and you can round it to the appropriate number of decimal places based on your preference.