Formula One currently uses 1.6-litre four-stroke turbocharged 90-degree V6 double-overhead-camshaft engines, introduced in 2014 and developed across subsequent seasons. From 2023, specifications including software and the maximum per-engine price to teams (€15,000,000) were frozen until the end of 2025, when the entirely new 2026 regulations took effect.
The history of F1 engines has always been a quest for power at high rotational speed, exceeding 20,000 rpm during the 2004–2005 seasons. Renault introduced pneumatic valve springs in 1986 — replacing metal springs that limited engines to around 12,000 rpm — and since the 1990s every manufacturer has used them. From 2014, a maximum fuel flow rate of 100 kg per hour shifted competition from raw power to thermodynamic efficiency: current F1 engines achieve around 40 bar BMEP using lean and rapid-burn combustion, a mechanical compression ratio capped at 18:1, and energy recovery via the MGU-K (kinetic) and MGU-H (heat). Honda's RA621H of 2021 generated over 100 kW more maximum power than the RA615H of 2015 at the same fuel flow rate.
The first Formula One era combined pre-war 1.5-litre supercharged regulations with 4.5-litre atmospheric engines. Power reached up to 425 hp, though the BRM Type 15 of 1953 reportedly achieved 600 hp from a 1.5-litre supercharged unit. In 1952 and 1953, the World Drivers' Championship was run to Formula Two regulations, though Formula One races continued.
Engine capacity for normally aspirated cars was reduced to 2.5 litres, with supercharged engines limited to 750 cc. No constructor built a supercharged engine for the World Championship. Power peaked at around 290 hp.
A new 1.5-litre formula was introduced in 1961, coinciding with the universal switch from front- to mid-engined cars. Initially underpowered, the formula matured: by 1965 average power had risen nearly 50 percent and lap times were faster than in 1960. Power ranged from 150 hp to 225 hp.
The FIA increased engine capacity to 3.0 litres atmospheric and 1.5 litres compressed in 1966, reflecting the need to keep Formula One cars ahead of sports cars. The Cosworth DFV 3.0-litre V8, introduced in 1967 initially in the Lotus 49, was a landmark: its stressed-member design — bolted directly to the monocoque with the gearbox and suspension attached to the engine — became the de facto architecture of a Grand Prix car. Renault debuted turbocharging in 1977 with their Gordini V6 at Silverstone; by the early 1980s Ferrari, BMW, Honda, and Porsche/TAG all fielded turbos, and by mid-1985 every Formula One car was turbocharged. BMW's M12/13 straight-four produced 1,400–1,500 hp at 5.5 bar boost in 1986 qualifying — the highest peak power outputs in the sport's history. Naturally aspirated 3.5-litre engines were reintroduced for 1987, with turbos retained for two further seasons before their ban in 1989. Honda's V6 turbos dominated: the RA167E powered Nelson Piquet to the 1987 championship with Williams, and the RA168E powered Ayrton Senna to the 1988 title with McLaren, winning fifteen of sixteen races.
Naturally aspirated engines up to 3.5 litres were reintroduced for 1987, with the turbo option retained for two further seasons before its ban in 1989. FIA regulations limited turbo boost to 4 bar in qualifying in 1987. Honda's V6 turbos dominated: the RA167E powered Nelson Piquet to the 1987 championship with Williams, and the RA168E powered Ayrton Senna to the 1988 title with McLaren — winning fifteen of sixteen races.
Turbochargers were banned from 1989, leaving a purely naturally aspirated 3.5-litre formula. Honda's RA109E 72-degree V10 gave 685 hp at 13,500 rpm in McLaren cars, before Renault's V10 became the dominant force from 1992 onward. Renault-engined Williams cars won the last three consecutive constructors' championships of the 3.5-litre era (1992–1994). Ferrari's Tipo 043 V12 of 1994 produced around 850 hp at 15,800 rpm — the most powerful naturally aspirated V12 ever raced in Formula One.
A 3.0-litre formula replaced the 3.5-litre rules in 1995. Power ranged from 600 hp to over 950 hp, with revs climbing to 20,000 rpm by 2004–2005. The BMW P82 was the first engine in the 3.0-litre era to break 19,000 rpm, achieving this during qualifying for the 2002 Italian Grand Prix. Toyota claimed over 1,000 hp from its RVX-06 engine by the mid-2000s. The V10 configuration became mandatory for all teams in 2000 to contain development costs.
Regulations mandated 2.4-litre 90-degree V8 engines for 2006, the last season before a 19,000 rpm mandatory rev limiter was imposed. Cosworth and Renault reached over 20,000 rpm during 2006. The engine specification was frozen from 2007 to hold down development costs. Kinetic energy recovery systems (KERS) were introduced in 2009, offering up to 81 hp for approximately 6 seconds per lap. Power in this era typically ran 700–800 hp at 18,000 rpm.
The FIA introduced 1.6-litre turbocharged V6 hybrid power units for 2014. Energy recovery was split between the MGU-K (kinetic, up to 120 kW) and the MGU-H (heat, recovering exhaust energy to drive the turbocharger or send power to the MGU-K). The maximum fuel flow rate of 100 kg/h replaced a rev limit as the primary power constraint; in practice, engines rarely exceeded 12,000 rpm. Mercedes, Ferrari, and Renault initially supplied engines under the new formula; Honda returned in 2015 with McLaren. Red Bull switched from Renault to Honda power in 2019. After Honda's 2021 withdrawal, Red Bull took the engine development in-house as Red Bull Powertrains. The engine and control-electronics specification was largely frozen from the 2022 season through to 2025.
New power unit regulations introduced for 2026 retain the turbocharged 1.6-litre V6 but greatly increase electrical contribution, targeting an approximately 50-50 split between combustion (around 540 hp) and electrical output (MGU-K raised to 470 hp). The MGU-H was removed. Audi entered as a new supplier in 2026; Ford joined as Red Bull Ford Powertrains after a 21-year absence; Honda returned via its Honda Racing Corporation subsidiary; Ferrari, Mercedes-AMG, and Alpine (Renault) also registered. Renault subsequently announced it would not supply engines under the 2026 formula, concluding its programme at the end of 2025. Early in the 2026 season, concerns about "super clipping" — cars losing speed on long straights during electrical harvesting phases — prompted the FIA to raise the clipping limit and begin moving toward a revised 60-40 combustion-to-electrical split.
The Formula One engine has served as a laboratory for technologies that later reached road cars: pneumatic valve springs, direct injection, carbon-fibre composite structures, energy recovery systems, and advanced lean-burn combustion strategies. The shift since 2014 toward heavily electrified power units delivering over 40 percent thermal efficiency has made the Formula One power unit the most thermodynamically efficient internal combustion engine in series production — a distinction that increasingly shapes the sport's argument for its own relevance as automotive electrification accelerates.