Porsche Guru Rebuilds Rare 4-Cam Engines

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Jeff Adams, a Porsche expert in Danbury, Connecticut, has rebuilt around 200 of the roughly 1,700 Porsche 'Fuhrmann' Type 547 four-cam engines ever made. These rare, high-revving engines powered iconic Porsche models like the 550 Spyder, 718, and 904 Carrera GTS. Despite their reputation for being difficult to maintain, Adams says many of the urban legends about these engines are unfounded, and he seeks to restore them to their original factory specifications for collectors.

Why it matters

The Fuhrmann four-cam engines are an important part of Porsche's early racing heritage and helped establish the brand's reputation for high-performance sports cars. As values of classic Porsches continue to rise, the demand for expertly rebuilt examples of these rare engines has also increased, making Adams' specialized skills highly valuable to collectors.

The details

Adams, who bought his first Porsche at age 17, has spent decades mastering the restoration of the Fuhrmann four-cam engines. Each rebuild takes around 450 hours of labor and can cost up to $150,000. These engines, designed by Ernst Fuhrmann in the 1950s, were known for their high-revving performance but also their complexity, which made them challenging for typical Porsche mechanics and owners to maintain. Adams has access to original factory drawings and employs specialized techniques to ensure the engines are restored to perfect factory condition, even reproducing rare and expensive parts like a $15,000 flywheel section.

• The Fuhrmann Type 547 engine was first tested in April 1953.
• Adams has rebuilt around 200 of the roughly 1,700 Type 547 engines ever made.

What they’re saying

What’s next

Adams continues to seek out rare and damaged Fuhrmann engines to restore, as demand from collectors remains high for these iconic Porsche powerplants.