Per Gillbrand: The Engineer Who Built Volvo’s Immortal Engine and Gave Saab Its Turbo Soul

The Man Who Built an Immortal Engine – Then Reinvented the Car

There is a story told about Per Gillbrand, the Swedish engineer who would one day become synonymous with the turbocharged Saab, that gets at something essential about how he thought. When skeptics challenged his conviction that turbocharging belonged in everyday passenger cars, he had a simple answer: every engine already has an oil pump, a fuel pump, and a water pump. Why not an air pump? A turbocharger, he pointed out, is all that really is. The logic was disarming, the confidence absolute. What followed was a career that reshaped two of Sweden’s most beloved automotive brands – and, through them, the global industry.

Gillbrand was born in 1934. He came to Volvo’s engine development department in Gothenburg in 1960, aged just 26, handed a brief that would intimidate a far more seasoned engineer: develop the powerplant for the new Volvo P1800 sports car. What emerged was the B18 – a straight-four with a five-bearing crankshaft at a time when three bearings were the norm, featuring bearings larger than those found in contemporary truck engines, and a gear-driven camshaft rather than a belt or chain. It was, from the first bolt, engineered to outlast everything around it.

The Engine That Would Not Die

The B18 became the foundation of what Volvo would later call the Redblock family – a lineage of cast-iron four-cylinder engines painted in a deep, distinctive red, a color chosen so that any oil leak or fracture would show clearly against the block. The irony was that these engines rarely leaked and almost never cracked. The red paint, as it turned out, was largely decorative reassurance.

The B18 gave way to the B20, then to the B21 in 1975 when the Volvo 240 arrived, and the B23 in 1979. What remained constant across the entire family was the engineering philosophy Gillbrand helped establish: an oversized oil pump, robust crankshafts, and power outputs that left substantial headroom within each engine’s mechanical limits. The result was a motor that simply refused to wear out.

The most vivid proof came not on a test bench but on American roads. A schoolteacher named Irvin Gordon bought a Volvo P1800 with a B18 engine in 1966. He drove it with a devotion that bordered on the obsessive. By 1998, his odometer showed 1,690,000 miles – enough to earn a place in the Guinness World Records as the greatest distance ever covered by a privately owned car. Gordon continued driving until his death in 2018, by which point the P1800 had accumulated over 3,200,000 miles – more than 515,000 kilometers – with the engine rebuilt only twice, both times preventively. The car is now on permanent display at the World of Volvo museum in Gothenburg. The Redblock B23 was recently ranked by the automotive site Carbuzz among the ten most durable four-cylinder engines ever built. Their verdict was succinct: “Impossible to kill.”

Gillbrand, by the time that record was being set, had long since moved on. In 1964, he crossed the floor to Saab.

Trollhättan and the Problem Nobody Had Solved

The automotive world of the early 1970s was grappling with a contradiction. Turbocharging offered a route to more power from smaller, more efficient engines – exactly what the oil crisis demanded. But the technology was volatile. Early turbocharged engines suffered from dangerous pressure spikes and catastrophic detonation. Several manufacturers had tried and retreated. The prevailing wisdom was that turbocharging was a motorsport tool, not a product suitable for the driveways of family-car buyers.

Gillbrand disagreed. At Saab, he led the team that fitted a turbocharger to the Saab 99, bringing it to market in 1977. The achievement was substantial on its own terms – a 23 percent gain in maximum horsepower and a 45 percent increase in torque over the naturally aspirated engine – but the more profound contribution was in controlling what happened inside the combustion chamber under boost. Gillbrand and his colleagues developed a bypass valve to manage boost pressure, a solution elegant in its simplicity but demanding in its engineering. Saab became the first manufacturer to offer turbocharged engines in passenger cars on a meaningful, large-scale basis. The nickname Turbo-Pelle arrived, and it stuck.

APC: The Invention That Changed Everything

Three years after the Saab 99 Turbo, Gillbrand’s team went further. The problem they faced was fundamental: fuel octane ratings varied considerably between markets and even between filling stations. A turbo calibrated for one octane level would detonate – destructively – on lower-grade fuel. The conventional solution was to set boost conservatively enough to accommodate the worst fuel available. This meant leaving performance on the table everywhere the fuel was better.

What Gillbrand’s engineers devised instead was the APC – Automatic Performance Control. It was, as the American motoring journalist Don Sherman wrote in Car and Driver in 1980, the most ingenious turbo-control system conceived since the wastegate. A knock sensor on the engine block fed signals to a compact electronic control unit, which in turn modulated a solenoid valve in the boost-pressure line. The moment the sensor detected the onset of detonation, the system trimmed boost pressure – automatically, in fractions of a second – before damage could occur. When the knock subsided, boost crept back up. The engine was always running at the edge of its capability, and always within it.

The consequences were immediate and significant. Compression ratio could be raised from 7.2:1 to 8.5:1, improving off-boost response and fuel economy by around eight percent. Torque delivery improved across the entire rev range. Peak power held at 135 horsepower – the limit of the front-wheel-drive transaxle – but the car felt substantially more alive in daily use. For a full explanation of how the APC system works in practice, the architecture is as precise as it is logical. By the time rivals caught up, Saab had already moved to the next challenge.

By the time of his retirement, Gillbrand held 21 international patents. The technology he pioneered did not stay with Saab. Turbocharged engines are now standard across virtually every segment of the global market. Every modern variable-boost turbo system, every knock-sensing management strategy, carries the intellectual lineage of work done in Trollhättan under Gillbrand’s direction.

After the Drawing Board

What distinguishes Gillbrand from many engineers of comparable technical achievement is what he did after his working life ended. He did not retire in the conventional sense. He went home and built engines – miniature ones, assembled with the same precision and delight in mechanical problem-solving that had defined his career. A working W16. A scaled replica of the Rolls-Royce Merlin aircraft engine. He held public engine demonstrations, the most celebrated of which took place at the Berwaldhallen concert hall in Stockholm when he turned 80, where he showed the miniatures, told their history, and let the audience hear the engines run. It was the act of a man who had never separated his work from his wonder.

He died in 2016.

In 2023, FIVA – the Fédération Internationale des Véhicules Anciens – inducted Gillbrand posthumously into its Heritage Hall of Fame, the first Swede to receive the honor. The ceremony took place in Nyköping, alongside the Motorhistoriska Dagen prize presentation. It was recognition long overdue, though Gillbrand himself might have pointed out that the engines he built were their own argument.

The Thread That Runs Through Both

It is worth pausing on what makes Gillbrand’s story unusual in automotive history. Most engineers are associated with a single company, a single marque, a single era. Gillbrand’s fingerprints are on two of Sweden’s defining automotive legacies – the near-indestructible Volvo Redblock and the turbocharged Saab identity that the brand carried to the end of its production life. He is, in a meaningful sense, the engineer who gave Volvo its endurance and Saab its character.

The P1800 that Irvin Gordon drove past three million miles and the Saab 99 Turbo that opened the world to boosted passenger cars are separated by time and marque, but connected by the same set of hands and the same conviction that an engine should be designed to be not merely adequate but genuinely excellent. Turbo-Pelle understood something that has only become more obvious with time: the best engineering is the kind that keeps working long after the man who designed it is gone.

More on Saab’s Turbo Technology

The APC system Gillbrand’s team developed in the early 1980s remains one of the most elegant engineering solutions in automotive history — a feedback loop so logically constructed that rival engineers reportedly could not believe no one had built it sooner. For a closer look at how Saab’s Automatic Performance Control system actually functions, the original 1980 Car and Driver technical breakdown holds up remarkably well more than four decades later.