How Do You Start A Formula 1 Engine?

• Formula 1 cars carry no onboard starter motor; every engine requires an external starter unit, pre-heated coolant, pressurized oil, and a laptop-controlled warm-up sequence before the car is cleared to leave the garage.
• The 2026 power unit is a 1.6-litre V6 turbo hybrid producing a near-equal split between combustion and electrical power, with the upgraded MGU-K generating 350kW to the rear wheels, almost three times its previous output.
• The removal of the MGU-H for 2026 has created a turbo lag problem at race starts, forcing drivers to pre-spool their turbos for up to 10 seconds on the grid, prompting the FIA to add a mandatory five-second pre-start warning to the race start sequence.

Starting a Formula 1 engine is nothing like turning a key in a road car. The process requires an external team, multiple pieces of support equipment, and a sequenced procedure that takes several minutes before the power unit fires into life.

F1 cars carry no onboard starter motor. The weight of a unit powerful enough to turn a modern F1 engine would be a performance penalty no team would accept, so a mechanic connects a heavy external starter to the rear of the car, inserting a probe into the gearbox to engage two pairs of gears. The external starter connects to the flywheel and, when the signal is given, spins the crankshaft until the engine fires.

Before that can happen, the engine must be brought up to temperature from the outside. A hot coolant circulating pump heats the engine to approximately 80 degrees Celsius. At the same time, oil that has drained to the oil tank is heated to its own specified temperature, with both processes running in parallel and monitored separately on engineer laptops. A supply of compressed air is also pumped into a bottle connected to the engine to offset any pressure losses in the pneumatic valve system at start-up.

Nearly every control system on an F1 car is hydraulic. Before the engine starts, an external pump connects to each system to flush fresh fluid through and bleed any trapped air. Engineers check each system for correct movement while the external pump is still connected, clearing any faults before the engine becomes its own hydraulic source.

The car connects to the pit garage network through a socket in the cockpit, giving every engineer’s laptop access to live data from the power unit. One technician monitors the engine control unit, tracking temperatures, pressures, and sensor positions across every element of the power unit. The engine is started from the supervising engineer’s laptop rather than from inside the cockpit; no driver is needed in the seat at this stage.

With heating complete and hydraulics checked, the mechanic connects the external starter and receives the go-ahead. A software control on the engineer’s station prevents the engine firing before the correct moment. The starter cranks the crankshaft for a period that varies depending on how long the engine has been idle. An engine returning from a recent run needs only a few seconds of cranking, as warm oil residue remains on the internal surfaces. A cold start from scratch requires a longer cycle.

Once running, the engine idles at between 3,000 and 4,000 RPM while the engineer monitors warm-up through the laptop. The engineer controls the throttle during this period, checking that temperature and pressure readings pass through a series of RPM checkpoints within specification. Before shutdown, the engine is run briefly at 7,000 RPM so oil drains fully back to the oil tank.

The entire sequence has to be timed on race days. F1 engines generate heat rapidly when stationary, and a car sitting in the pit lane without the airflow provided at racing speed will overheat within minutes.

The 2026 power unit represents the most significant change to this process in over a decade. The architecture remains a 1.6-litre V6 turbocharged hybrid, but the balance between combustion and electrical output has shifted to an approximate 50-50 split. The internal combustion element now produces around 400kW, down from the previous era’s 550-560kW. The MGU-K, which harvests energy under braking, has been upgraded to deliver 350kW to the rear wheels, nearly three times the 120kW of the previous regulations. Energy recovery capacity has expanded to 8.5 megajoules per lap, double the previous allowance.

The most consequential change for the start-up procedure is the removal of the MGU-H, the motor generator unit attached to the turbocharger. In the previous power unit era, the MGU-H spooled the turbocharger at low revs, eliminating turbo lag almost entirely. Without it, the turbo must reach operating speed purely through the combustion engine, and at low revs that process takes significantly longer.

At race starts, that lag became a serious problem from the first day of pre-season testing. Drivers must rev the engine for up to 10 seconds on the grid to spool the turbocharger to the point where it can deliver full torque off the line. Timing the process incorrectly either produces a slow getaway or triggers the car’s anti-stall system. During a group practice start in Bahrain, only two cars managed to leave the line cleanly.

George Russell was direct about the scale of the problem.

“I think we’ve got a lot of potential beneath us but to win a race, you’ve also got to get off the line quite well. The two starts I’ve made this week were worse than my worst ever start in Formula 1,” he said.

Oscar Piastri estimated that a poor start under the 2026 procedures could cost a driver as many as “seven spots,” a loss comparable to the chaos of a lower series rather than a premier-class championship.

McLaren team principal Andrea Stella called for the safety implications to be addressed before the season-opening Australian Grand Prix.

“We are talking about safety on the grid. There are some topics which are simply bigger than the competitive interest. And for me, having safety on the grid, which can be achieved with simple adjustment, is just a no-brainer,” Stella said.

Ferrari entered 2026 with a structural advantage in this area. The team developed a smaller turbocharger with reduced turbine inertia, cutting the time needed to spool up at a standstill. Ferrari reportedly raised the turbo lag concern with other teams in mid-2025 and went on to block a proposed rule change that would have reduced the competitive advantage they had built into their design.

Ferrari team principal Fred Vasseur was candid about the situation.

“Without the MGU-H, it was clear that turbo lag would become a factor to manage, from drivability to race starts. This has been known from day one. When evaluating choices in defining the guidelines for a power unit, it’s not just about pure power, other aspects matter as well, and one of these is the start,” Vasseur said.

The FIA responded to safety concerns by adding a five-second pre-start warning to the race start sequence. Grid panels flash blue for five seconds before the standard start light sequence begins, giving every car additional time to spool the turbocharger. Cars at the back of the grid, which arrive at their positions last, had faced the most serious risk of running out of time to complete the spool-up cycle under the original procedure.

The 2026 power unit also runs on advanced sustainable fuel for the first time in the championship’s history, derived from sources including carbon capture, municipal waste, and non-food biomass, and independently certified against sustainability standards. It adds another variable to the thermal management picture engineers track from the moment hot coolant first flows through the engine on a race morning.

Five manufacturers supply power units in 2026: Mercedes, Ferrari, the Red Bull and Ford collaboration, Honda in partnership with Aston Martin, and Audi, which has taken over the Sauber operation. Each builds to the same regulations but has made different engineering choices in how it balances combustion output, electrical delivery, and the start-line behavior that has already defined the opening weeks of the new era…

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Formula 1 Engine: FAQs