The Porsche Flat Six Engine

The Porsche 911 is almost unique in its use of the flat-six ‘boxer’ engine. Giving the 911 a truly unique sound, the flat six engine was air-cooled from the earliest days of 911 in 1963 until the 993 model finished in 1998, when air-cooled power was superseded by the water-cooled Porsche 996.

Featuring two horizontally-opposed banks of three cylinders each, arranged around a central crankshaft, the Porsche flat six is a famously reliable engine when properly put together. A great engine is smooth and tractable, giving accessible power through the rev range. It should also tolerate running close to the red line for hours on end.

FIA-Sealed Engine Building

Attention to detail is everything in the building of a great Porsche engine, and Tuthill Porsche has built hundreds of powerful and reliable 911 engines to date. Our in-house engine shop has built many combinations of bottom and top end components and knows how to get the most from many engine displacements, whether FIA-inspected 2-litre 911S engine, 2.5-litre short stroke, 3-litre FIA engines or the fire-breathing 3.5 or 3.8-litre engines used in open rules rallying or for luxury Porsche hot rod builds.

Porsche Rennsport Racing Engine Rebuilds

Tuthill has also rebuilt a large number of heritage factory original racing engines, including our most recent project: a genuine 904 GTS engine. Other projects include 2.8 RSR on high and low butterfly throttles, 3.0 RS and RSR engines on slide throttles, genuine SC RS engine on Kugelfischer mechanical fuel injection and more. We have also rebuilt Dakar 959 and Porsche 924 Carrera GT MFI engines.

Porsche Transmission Rebuilds and Upgrades

Tuthill Porsche manufactures many of its own gearbox parts, not available elsewhere. We carry out all imaginable upgrades for Porsche gearboxes and have rebuilt everything up to and including the latest 997 GT3 Cup transmissions. Gearboxes are our speciality: no job is too big, or too small.

Call us on 01295 750 514 to discuss your engine and transmission building questions. Our engine shop is available to visit by appointment: please ask for details.