Rünge’s Hetzer is a reported air-cooled, 5.3-liter flat-eight intended for classic Porsche 911 G-body fitment. The Drive’s October 6, 2026 report gives a preliminary configuration and a theoretical 1974–1989 application range—but no confirmed power figures, price, order availability, or installation details.
What are the reported Hetzer flat-eight specs?
According to The Drive’s October 6, 2026 report, the engine is air-cooled and displaces 5.3 liters. The report lists 32 valves, dual overhead cams per bank, and a 12:1 compression ratio. These are reported specifications; the article does not cite a manufacturer technical sheet confirming them.
- Configuration: flat-eight, air-cooled
- Displacement: 5.3 liters
- Valvetrain: 32 valves, dual overhead cams per bank
- Compression ratio: 12:1
Will it fit a 1974–1989 Porsche 911?
The Drive says Rünge intends the engine for classic 911 G-body cars and names model years 1974 through 1989. It characterizes the fitment as theoretical, so that range is an intended application—not a verified compatibility list or guarantee that the engine will fit a particular car without modifications.
The report does not provide dimensions, installation instructions, transmission compatibility, or a detailed list of supported models. Owners should treat those as unresolved until Rünge publishes application-specific documentation.
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How much power does it make?
The report does not publish horsepower or torque figures. It says those figures were expected around December 2026; it does not establish whether they were subsequently announced. The linked dyno-run video is not accompanied by a measured output or test conditions in the article, so it cannot support a specific power claim.
What will the flat-eight cost, and can you order one?
The cited report gives no confirmed price or order availability for the Hetzer. Its mention that some previous Rünge bespoke creations cost up to $250,000 is background about other work, not a quote or estimate for this engine. Production quantity, release timing, warranty, and support terms are also not stated.
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What else remains unconfirmed?
The report does not establish the engine’s weight, emissions status, installation requirements, or legal status for road use. It also supplies no manufacturer documentation on warranty or production. Those details matter to a build plan, but they cannot be inferred from the reported configuration or intended fitment.
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