One engineer. Forty-seven years of Porsche engines.
The early years
Hans Mezger was born in 1929 in Ottmarsheim, a small town near Ludwigsburg in Württemberg, Germany. He studied mechanical engineering at the Technical University of Stuttgart through the early 1950s. He joined Porsche in October 1956 at the age of 27. His first assignment was on the racing engine for the 550 Spyder, the small four-cylinder mid-engine racer that had just been launched.
By 1960, Mezger was running engine design for the Porsche racing program. The cars of that era were 1.5 and 2.0 liter sports racers and Formula 1 entries. The Formula 1 effort produced the 804, an air-cooled flat-eight that won the 1962 French Grand Prix with Dan Gurney driving. The 804 was a Mezger design.
The 911 engine, 1963
Porsche needed a new engine for the upcoming 911 model. The board had decided the car would replace the 356, and the production economy of a flat-six was strategically necessary. Mezger and his colleague Ferdinand Piëch led the engineering team that designed the engine.
The architectural decisions were Mezger's. Horizontally-opposed flat-six. Air cooling. Single overhead camshaft per cylinder bank, driven by chains. Dry-sump lubrication. Two valves per cylinder. The engine displaced 2.0 liters initially and produced 130 horsepower in the launch 911. The same architecture, scaled and refined, powered every air-cooled 911 from 1964 through 1998.
Mezger explained the design decisions over the decades in various interviews. The flat-six was chosen for the low center of gravity it provided to a rear-engine car. The air cooling was chosen for reliability and weight. The dry-sump system was chosen for racing applications, where lateral and longitudinal g-forces would starve a wet-sump engine of oil. The architecture proved durable enough that Porsche refined it for 34 years before transitioning to water cooling in 1999.
The 917 program
Mezger led the engine team that developed the 917 in 1968 and 1969. The 917 used a flat-twelve engine that was effectively two 911 flat-sixes joined at the center. Displacement started at 4.5 liters and grew to 5.0 liters over the production run. Race trim produced approximately 580 horsepower in 1970 and approximately 1,100 horsepower in the twin-turbocharged Can-Am 917/30 variant.
The 917 program produced Porsche's first overall Le Mans victories in 1970 and 1971. Mezger's role was not the obvious one. He did not race the cars. He did not even attend many races. His work was the engineering. The team in the pits and on track translated that work into results.
The TAG-Porsche Formula 1 engine
In 1981 Porsche received a contract from TAG and McLaren to develop a Formula 1 engine. Mezger led the design. The TAG TTE PO1 was a 1.5 liter twin-turbocharged V6, completely different from the 911 architecture but informed by Mezger's experience with high-output racing engines. The engine ran in F1 from 1983 through 1987 and powered three consecutive World Championships in 1984, 1985, and 1986.
The 935 program
The 935 race car of the late 1970s used heavily-modified 911 turbo engines based on Mezger's original 911 architecture. Mezger oversaw the engineering of those engines from his role at the racing department. The 935 won five Daytona 24 Hours races, four Sebring 12 Hours, and Le Mans in 1979. The engine work that supported those results was Mezger's responsibility.
The retirement years
Hans Mezger formally retired from Porsche AG in 1995, after 39 years of continuous employment. He was 65. The retirement was not a withdrawal. Mezger continued as a consultant to the racing department and to the production engine programs through the late 1990s and into the 2000s.
His final substantial contribution was the GT3 flat-six. When Porsche launched the water-cooled 996 in 1999, the base Carrera used a new engine architecture (the M96) that proved problematic in production. The 996 GT3 launched alongside the base car with a different engine, derived from the 911 GT1 prototype that had won Le Mans the year before. That engine, the Mezger flat-six in modern form, was designed under Mezger's continuing technical involvement.
The Mezger flat-six powered every GT3 and every Turbo from 1999 through 2011. The engine is widely considered effectively bulletproof, in contrast to the contemporary M96 base engine. The reliability difference is the primary reason that Mezger-engined 997 GT3 and 997 Turbo cars now command substantial premiums over equivalent-mileage base 911s of the same year.
The end
Hans Mezger died in June 2020 at the age of 90. His engines were in continuous production from 1964 through 2012 in their various forms. Forty-seven years. No other engineer in automotive history has overseen that long a run of architectural continuity in a single brand's production engine lineup.
The cars themselves continue to be valued partly because of the engineering identity Mezger gave them. A 1973 Carrera RS is a Mezger engine in a Mezger-era chassis. A 997 GT3 RS 4.0 is also a Mezger engine, refined for a different era. The continuity between them is real, not marketing language.