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
The motor on the crankshaft that turns braking zones into fuel.
120 kW (~160 hp), deploy and harvest·2 MJ per lap into the battery (2014 rules)·4 MJ per lap from the battery·Brake-by-wire rear brakes
· WHAT IT DOES
The MGU-K (K for kinetic) is an electric motor about the size of a melon, geared straight to the engine’s crankshaft. On the straights it adds 120 kW — some 160 horsepower — of silent push. Into the corners it flips into a generator: the rear wheels drive it, it charges the battery, and energy that every earlier car blasted out of glowing brake discs is banked for the next straight.
· WHY IT MATTERS
A 690 kg car slowing from 300 to 100 km/h gives up about 2 megajoules. Brake discs turn that into 700 °C of waste heat; the MGU-K diverts a slice of it — capped by rule at 2 MJ per lap into the battery — and gives it back as acceleration. The demo splits one braking event between disc and battery.
· WHY IT MATTERS
The harvesting torque acts only on the rear axle, so the brake balance shifts corner by corner as the system works. Modern F1 brake pedals are partly a request to a computer — “brake-by-wire” exists because of this unit.
· WHY IT MATTERS
160 electric horsepower, but only while the battery lasts — where on the lap to spend it (defending, attacking, quali laps) became a new engineering discipline. The energy store page picks up that story.
· TRY IT
Slow the car from 300 to 100 km/h and choose how hard the MGU-K harvests. Watch the 2 MJ of kinetic energy split between brake-disc heat and the battery — and how the rear brake balance shifts as the motor does the discs’ job.
Even at full power the motor takes a modest slice of each stop — the rest still cooks the discs — but eight stops a lap for sixty laps is a fuel tank’s worth of free energy. And because the K brakes only the rear axle, the pedal became brake-by-wire to keep the balance.