The Formula One engine displacement limit introduced in 2014 is 1.6 litres. The change replaced the previous 2.4-litre naturally aspirated V8 formula with smaller, turbocharged V6 hybrid power units.
The 2014 regulations were designed to make Formula One more relevant to modern road-car technology while retaining extreme performance. The new units combined a 1.6-litre internal-combustion engine with energy-recovery systems, including the MGU-K, which recovers braking energy, and the MGU-H, which recovered energy from the turbocharger system under that generation of rules.
The displacement figure describes the swept volume of the internal-combustion engine’s cylinders. It does not mean the complete power unit produces only the performance associated with a small road car: turbocharging and electrical assistance allow F1 cars to generate very high power and acceleration.
A common mistake is to answer 2.4 litres, because that was the displacement limit for the V8 engines used from 2006 through 2013. The 1.6-litre V6 turbo-hybrid era began in 2014 and continued through the 2025 regulations, with the 2026 rules retaining a 1.6-litre V6 while changing the hybrid system.