Timelines · Formula 1 · 7 of 7
Half the fuel, more power: the racing car became the most efficient engine on Earth.
2014·Mercedes PU106A: 1.6 L V6 turbo + MGU-K + MGU-H + battery·~750 hp combined (ICE ~600 + 160 electric)·2014: 16 wins in 19 races; both titles (Hamilton)·>40% in 2014 — >50% achieved by 2017
· THE STORY
In 2014 Formula 1 rebuilt the engine as a “power unit”: a small turbo V6 joined by two electric motor-generators — one harvesting energy from braking, one from the turbocharger itself — feeding a battery. The Mercedes W05 mastered the formula first and utterly: energy that every previous racing car wasted as heat now comes back out as lap time, and these engines convert fuel to work more efficiently than any other piston engine ever built.
· WHY IT MATTERED
The MGU-K motor on the crankshaft turns into a generator when the driver brakes, banking up to 120 kW into the battery instead of cooking the rear discs — then gives it back as electric push on the next straight. Watch the flows reverse in the demo as the lap phase changes.
· WHY IT MATTERED
The MGU-H sits on the turbo shaft and milks the exhaust turbine for electricity — energy recovery with no braking needed at all. It also spins the compressor up electrically, erasing turbo lag. It is the J58’s lesson from this site’s jet section — never waste exhaust energy — perfected.
· WHY IT MATTERED
Fuel was capped at 100 kg per race and 100 kg/h of flow, so the fastest car was by definition the most efficient one. The 2014 rules dragged thermal efficiency from ~29% to over 40% — beyond 50% on the dyno since — numbers no road engine and no previous racing engine had touched.
· TRY IT
Pick a phase of the lap and follow the kilowatts. On the straight the battery and engine push together; under braking the MGU-K becomes a generator and the rear axle recharges the battery; and all the while the MGU-H quietly taxes the exhaust. This flow diagram is the whole hybrid era.
Cycle the three phases and watch the teal arrows reverse: energy that every earlier F1 car dumped as brake heat and exhaust noise now loops through the battery and comes back as push. With fuel capped at 100 kg per race, recovering it wasn’t optional — it was the game.
Timelines · Formula 1 · component · Mercedes W05
A 25-kilogram battery that gets emptied and refilled every single lap.
Lithium-ion, 20–25 kg by rule·~4 MJ usable per lap by regulation·K-harvest 2 MJ/lap in · deploy 4 MJ/lap out · H uncapped·A full charge-discharge cycle every lap, ~60 laps per race
· WHAT IT DOES
Under the fuel tank sits a lithium-ion battery of roughly laptop-cell chemistry and utterly un-laptop duty: charged and discharged through megajoules every lap, for two hours, at up to 120 kW, while being shaken at 5 g. It is the power unit’s bank account — the MGU-K and MGU-H pay in, deployment pays out, and race engineers manage the balance corner by corner.
· WHY IT MATTERS
The rules cap what moves per lap: at most 2 MJ in from the MGU-K, at most 4 MJ out to it. Spend early and you run dry before the longest straight — “clipping”, where the electric push cuts out mid-straight and the car simply stops gaining. The demo lets you feel that budget.
· WHY IT MATTERS
Energy routed MGU-H → battery → MGU-K, or MGU-H → MGU-K directly, is uncapped. The teams that mastered the H (Mercedes, first and best) effectively enlarged their battery every lap — a rulebook subtlety worth tenths per lap for years.
· WHY IT MATTERS
Megajoules through 25 kg of cells makes heat; cells above ~60 °C age in minutes. The pack lives in the coolest structural spot on the car (under the fuel cell), dielectric-cooled — battery thermal engineering that later fed straight into road EVs.
· TRY IT
Choose how aggressively the car deploys its electric power around one lap. Watch the battery’s state of charge breathe — harvest in the braking zones, spend on the straights — and find the setting where greed empties the pack before the longest straight ends.
The battery is a budget refreshed every lap, and strategy is a spending plan: too timid leaves energy unspent, too greedy hits empty on the longest straight — “clipping”, visible on TV as a leader suddenly defenceless. Race engineers retune this slider for every circuit, and for every rival within DRS range.