How A Formula 1 Internal Combustion Engine Works In 2026

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A 2026 F1 internal combustion engine is a 1.6-litre V6 turbo capped at 400kW, or 536hp, revving to 15,000rpm and burning 100% sustainable fuel. It works alongside a 350kW (469hp) electric motor for a combined peak of around 1,000hp. The biggest change from the previous generation is that the MGU-H no longer exists, and the electrical side of the power unit has nearly tripled in its place.

• The ICE is capped at 400kW (536hp) from a 1.6-litre V6 turbo revving to 15,000rpm.
• The MGU-K produces 350kW (469hp), up from 120kW (160hp) under the previous regulations.
• Combined peak output sits at roughly 750kW, or about 1,000hp.
• The MGU-H has been deleted entirely for 2026, the single biggest change to the power unit.
• Cars burn 100% sustainable fuel, with a maximum of 70kg allowed per race.
• 2026 Belgian Grand Prix telemetry recorded 0-100 km/h in 2.79 to 3.04 seconds.

What Is the Internal Combustion Engine in a 2026 F1 Car?​

A 2026 F1 power unit is built from five elements: the internal combustion engine (ICE), the turbocharger, the MGU-K, the Energy Store and the Control Electronics. That is one fewer than the six elements that made up the previous generation. The MGU-H, the motor generator unit that recovered heat energy from the exhaust and used it to spin the turbocharger, does not exist in the 2026 regulations. Any explainer that still lists it as a current component is describing a car that stopped racing at the end of 2025.

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The ICE itself keeps a role that predates any of the hybrid systems: it is a fully stressed structural member, bolted directly between the chassis and the gearbox rather than sitting in its own subframe, and that has been true of every V6 turbo hybrid F1 car since 2014. F1 Chronicle’s guide to how much horsepower an F1 car has covers the full power breakdown; the ICE alone contributes 400kW (536hp) of that total, with the rev limit fixed at 15,000rpm. The gearbox it bolts to still uses a multi-plate clutch for race starts, as F1 Chronicle’s guide to whether F1 cars have a clutch explains.

How Does the Combustion Process Work?​

The four-stroke cycle in a 2026 F1 engine works the same way it has since 2014: intake, compression, power and exhaust, repeating up to 15,000 times a minute, or around 250 times a second.

Air enters through the roll hoop duct above the driver’s head and is compressed by the turbocharger before passing through a charge cooler, which brings the temperature back down before the air reaches the plenums at the top of the engine. From there it travels down six inlet ports and past two inlet valves per cylinder into the combustion chambers, where fuel is injected directly into the chamber rather than into the intake tract. That direct-injection layout is shared with most modern road cars, though F1’s fuel pressure sits far beyond anything in a showroom model.

One number has changed since this article was last accurate. Fuel injection pressure for 2026 is capped at 350 bar, down from the 500 bar limit that applied under the outgoing regulations, per Article 5.11.1 of the FIA’s 2026 Formula 1 Power Unit Technical Regulations. Combustion still reaches extreme temperatures despite the lower pressure: gas temperatures inside the chamber peak at around 2,600C, hot enough to melt most of the metals used elsewhere in the car.

What Fuel Do 2026 F1 Cars Use?​

F1 cars have run on 100% sustainable fuel since 2026, a drop-in fuel produced from carbon capture, municipal waste and non-food biomass rather than crude oil. It is designed to work in an unmodified ICE, which is what makes it a genuine drop-in replacement rather than a different category of engine entirely. F1 Chronicle’s dedicated guide to what fuel Formula 1 cars use covers how that fuel is produced; this section covers how much of it a car is allowed to burn.

The regulatory shift the outgoing version of this article missed entirely is how that allowance is measured. Fuel flow into the ICE used to be capped by mass, at 100kg per hour. Under the 2026 regulations, it is capped by energy instead, at 3,000 megajoules per hour. That closes a loophole mass-based regulation left open: different sustainable fuel blends carry different energy densities, so a mass cap alone could let a more energy-dense blend deliver more usable power for the same weight of fuel. Measuring energy rather than mass keeps the limit neutral across fuel blends. Separately, each car is limited to a maximum of 70kg of fuel for the full race distance.

How Does the Turbocharger Work Without the MGU-H?​

Every F1 turbocharger since 2014 has used a single turbine and compressor mounted on a common shaft, spun by exhaust gas on one end and driving compressed air into the engine on the other. What changed for 2026 is what else was attached to that shaft. From 2014 to 2025, the MGU-H sat on the same shaft as an electric motor-generator. When exhaust gas spun the turbine faster than the engine needed, the MGU-H absorbed the excess as electrical current, either topping up the Energy Store or feeding the MGU-K directly. When the driver got back on the throttle, it worked in reverse: the MGU-H spun the turbocharger shaft faster than exhaust flow alone would manage, pre-spooling the compressor before the exhaust gas caught up. The result was throttle response close to a naturally aspirated engine, with none of the hesitation a pure turbo produces while it waits for exhaust flow to build.

The FIA deleted the MGU-H for 2026 for three reasons, and none of them were about performance. The system spun at more than 100,000 revolutions per minute and needed specialised semiconductor and thermal-management technology that only a handful of manufacturers had ever developed, making it one of the biggest barriers to a new manufacturer entering the sport. It also had almost no relevance to road cars; production turbochargers deal with lag through mild-hybrid assistance, electronic wastegates and variable-geometry turbines, none of which resemble a 100,000rpm shaft-mounted generator. Removing it lowered the bar enough for Audi to enter the sport as a full manufacturer and for Ford to return as Red Bull’s powertrain partner within a single regulation cycle.

That leaves the 2026 turbocharger purely exhaust-driven, and turbo lag is back as a live engineering problem for the first time since 2013. Teams are managing it two ways. The hardware side is a lower-inertia turbocharger, a smaller, lighter rotating assembly that spools faster on exhaust energy alone than the larger units the MGU-H used to compensate for. The strategy side leans on the MGU-K, whose tripled output can deliver power to the wheels through the early part of corner-exit acceleration, partially masking the moment when the turbo is still building boost. It is not a complete substitute. Drivers have already flagged that the difference is most noticeable in slow corners, where the old MGU-H did its most valuable work and the 2026 car has to wait a fraction longer for boost to arrive.

How Does the Electrical Side Work With the Engine?​

The MGU-K is the only motor generator left on a 2026 power unit, and its output has nearly tripled to reflect that. It delivers 350kW, or 469hp, to the rear wheels under acceleration, nearly half of the power unit’s combined output and up from 120kW (160hp) under the old regulations. Under braking it runs in reverse as a generator, recovering up to 8.5 megajoules of energy per lap and storing it in the Energy Store for redeployment. F1 Chronicle’s g-force analysis of the 2026 season covers what that braking load feels like for the driver; this is where the energy it generates goes.

Deployment is not unlimited or constant through a lap. Drivers get a Manual Override Mode whenever they are within one second of the car ahead, which holds the MGU-K’s full 350kW deployment up to around 337 km/h instead of tapering off from 290 km/h, along with up to 0.5 megajoules of additional harvested energy per lap.

Two measured patterns from F1 Chronicle’s own 2026 data show what this looks like in a real race. Race speed-trap maxima have exceeded qualifying maxima by 18 to 35 km/h at every circuit measured this season, consistent with cars carrying more deployment in race traffic than they ever use on a single flying lap. And F1 Chronicle’s Belgian Grand Prix telemetry analysis measured lift-and-coast beginning around 50 metres earlier in the race than in qualifying across the lap’s braking zones, exactly the behaviour you would expect from drivers protecting energy for the next deployment opportunity rather than braking as late as physically possible.

How Is the Engine Kept Cool?​

Keeping a 2026 power unit within its operating window relies on the same intricate water and oil circuits that cooled the previous generation, working alongside a separate charge cooler for the compressed intake air. Water cooling manages the ICE itself, oil cooling protects the moving parts inside it, and the charge cooler brings compressed air back down in temperature before it reaches the plenums, all three doing that job while the engine runs at the extreme combustion temperatures described earlier.

Every one of those systems is also a drag penalty. Bigger radiators cool better but push more air resistance through the car, so cooling architecture is one of the quieter trade-offs teams make between outright pace and reliability across a race distance. Undersize the cooling and an engine that would otherwise last a full season can fail in a single weekend; oversize it and the car gives away lap time nobody else is losing.

How Have F1 Engines Changed Over Time?​

F1’s engines have gone through six distinct eras before the current one, each with its own displacement rules and its own trade-off between power and control.

The 1950s and early 1960s ran naturally aspirated engines up to 4.5 litres, before the formula shrank to 1.5 litres in 1961 and grew back to 3.0 litres in 1966, the capacity that powered the Cosworth DFV era. Turbocharging arrived in 1977 with Renault’s 1.5-litre V6 and by the mid-1980s had pushed qualifying-trim power past anything F1 has produced since. BMW’s M12/13/1 was estimated at around 1,400 to 1,450bhp in 1986 qualifying trim, though the era’s dynamometers maxed out at 1,400bhp, meaning true peak output was never actually measured and the figure has always been an estimate rather than a verified reading. The FIA banned turbos outright from 1989, replacing them with 3.5-litre naturally aspirated engines, a formula that shrank again to 3.0 litres in 1995 and standardised around V10 configurations for a decade. Ferrari ran V12s through part of that period, the last of them racing in the 412 T2 in 1995 before packaging and fuel-efficiency disadvantages against the V10 pushed every team away from twelve cylinders for good.

V10s gave way to 2.4-litre V8s in 2006, a change driven by cost control and safety as much as performance, before the sport’s biggest single engine shift arrived in 2014: a return to 1.6-litre V6 turbos, now paired with hybrid energy recovery through the MGU-K and MGU-H. That MGU-H hybrid era ran from 2014 to 2025, and it is the version of the power unit that most existing F1 coverage still describes.

2026 is F1’s clean break from that era rather than another incremental step. The displacement stays at 1.6 litres and the V6 layout survives, but the MGU-H is gone, the MGU-K’s output has nearly tripled, and the fuel is fully sustainable for the first time.

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Who Builds F1 Engines in 2026?​

Five manufacturers build 2026 power units, and only two of them supply just their own team. Mercedes builds for itself plus McLaren, Williams and, new for 2026, Alpine, which closed Renault’s decades-long in-house engine programme and switched to customer Mercedes power for this generation. Ferrari builds for itself plus Haas and, also new for 2026, Cadillac, whose engine supply deal with Ferrari was confirmed as part of its entry into the sport as an eleventh team. Red Bull Ford Powertrains, the joint venture between Red Bull’s own engine division and Ford, supplies Red Bull and Racing Bulls. Honda returned as a full works partner to Aston Martin rather than a customer supplier, ending its previous arrangement with Red Bull. Audi enters the sport for the first time as a full power unit manufacturer, building at the former Sauber factory and supplying its own works team.

That is a materially different grid to the one the outgoing version of this article described, where Red Bull ran Honda power and Audi, Ford’s return and Cadillac had no presence in F1 at all. The MGU-H’s removal is a direct part of why the grid looks like this: lowering the technical barrier to entry is what made Audi’s full works programme and Ford’s return viable within a single regulation cycle.

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Formula 1 Internal Combustion Engine FAQs​

Does F1 still use the MGU-H?​

No. The MGU-H was deleted from the regulations for 2026. The turbocharger is now purely exhaust-driven, and the electrical side of the power unit runs through the MGU-K alone.

Are 2026 F1 engines hybrid?​

Yes, more than ever. The MGU-K alone now supplies close to half of a power unit’s combined output, compared with around 20 percent from the combined MGU-K and MGU-H under the old regulations.

What is the most powerful F1 engine ever?​

The BMW M12/13/1 turbo, run in 1986 qualifying trim and estimated at around 1,400 to 1,450hp. No dynamometer of the era could measure outputs that high with confidence, so the figure has always been an engineering estimate rather than a measured one.

Why did F1 stop using V10 engines?​

Cost and safety. By the mid-2000s V10s were producing close to 950hp and revving past 19,000rpm, and the FIA mandated a switch to 2.4-litre V8s from 2006 to slow the cars and control spending.

Do F1 cars use V12 engines?​

Not since 1995, when Ferrari’s 412 T2 raced the last V12 in the sport. V12s were heavier and less fuel-efficient than the V10s that replaced them, and packaging one into an increasingly tight chassis became a genuine disadvantage.

How fast is an F1 car 0-100 km/h?​

Between 2.79 and 3.04 seconds, based on F1 Chronicle’s analysis of standing-start telemetry from the top five finishers at the 2026 Belgian Grand Prix. The same data recorded 0-200 km/h in 4.98 to 5.09 seconds.


Sources

• 2026 Formula 1 Power Unit Technical Regulations – FIA
• F1: Alpine to use Mercedes engines from 2026 season – ESPN
• Ferrari agrees engine deal with new F1 team Cadillac – ESPN
• Aston Martin confirm Honda as F1 engine partner from 2026 – Sky Sports
• Audi and Sauber confirm partnership from 2026 Formula 1 season – Sky Sports
• 1986: F1’s Power Year Part 1 – Boosted Rockets – Goodwood Road & Racing

Editor’s note: this article’s links to the ERS guide and power-units guide were checked live during research. Both still describe the MGU-H as a current component and quote its old power-split figures. They need their own 2026 rewrite; that is flagged for the content cluster, not fixed here, so neither is linked from this piece.

F1 Chronicle analysis of official F1 timing data, 2026 season, for the 0-100 km/h, 0-200 km/h, speed-trap and lift-and-coast figures.

Reviewed by Jack Renn, July 2026

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