A 6.6-liter V12 engine is a type of internal combustion engine that features twelve cylinders arranged in a V configuration. The "6.6-liter" designation refers to the engine's displacement, indicating the total volume of all the cylinders combined. This large displacement allows for greater power output and torque, making it suitable for high-performance vehicles and luxury cars. V12 engines are known for their smooth operation and refined performance due to the even firing order of the cylinders. They are often found in premium brands like Ferrari and Lamborghini, where they provide exceptional acceleration and a distinctive engine sound.