Talk Morgan Forums Community Vehicle Talk (non-Morgan) Marvelous Motors

Benelli .... Bialbero 175cc ..... DOHC from 1931 .... the innovative engineering of so many of these pre-war motorcycles really impresses me. Before the pushrod twins dominated because they could do 90% of the job for 50% of the price!






K

What a wonderful bit of kit, thanks for posting and adding to my appreciation of Italian engineering. In my early days of m/cycling I was rather fond of the Ducati ohc`s I had owned a i75 (?) the lovely little 200 cc with the curvaceous tank, and a 250cc. That Bialbero would seem to be a real treasure to own for any biker, past or present.. (-:

Jaguar V12 engine is one of the most iconic powerplants ever produced by a British automaker, known for its smoothness, refinement, and unmistakable character. Introduced in the early 1970s, it represented a major leap forward in performance engineering for Jaguar and became the heart of several flagship models, including the E-Type Series 3 and later the XJ12 luxury sedans. The engine shown here, with its prominent intake trumpets and polished headers, highlights the race-bred potential that this V12 always carried beneath its elegant exterior.

At its core, the Jaguar V12 was an all-aluminum 5.3-liter unit featuring a single overhead camshaft per bank in its early versions. This configuration gave the engine a very compact and lightweight feel for a V12, while maintaining exceptional smoothness. The 60-degree V layout provided natural balance, eliminating most vibrations and giving the engine a turbine-like quality at higher RPM. In standard road tune, it offered effortless acceleration and a wide, usable powerband suited to both sports cars and luxury vehicles.

The V12 was especially notable for its tuning flexibility. High-performance versions, such as those used in racing programs supported by Jaguar Cars, featured higher compression ratios, improved fuel systems, and dramatically freer-flowing exhaust manifolds. The racing variants often used mechanical fuel injection or multiple carburetors combined with custom headers, producing substantially more horsepower than the road-going models. The engine in the image reflects this racing spirit, with individual intake stacks and polished components that maximize airflow and throttle response.

One of the defining characteristics of the Jaguar V12 was its exceptional smoothness at any speed. Even under load, the engine delivered power with a refined, mellow sound unlike the sharp bark of V8s. This quality made it perfect for grand-touring applications, where long-distance comfort was as important as performance. Over the years, the V12 evolved into High-Efficiency (HE) versions featuring improved combustion technology and better fuel economy, extending its life well into the 1990s.

Today, the Jaguar V12 is celebrated as a masterpiece of classic British engineering. Whether in its elegant road-car form or in wild race-tuned configurations like the one pictured, it remains a symbol of Jaguar’s ambition during the golden age of automotive performance. Enthusiasts appreciate it for its smooth delivery, distinctive sound, and mechanical beauty. A well-built and well-maintained Jaguar V12 continues to be one of the most charismatic engines ever fitted to a production vehicle.

Like a No9 bus another marvel turned up today knew nothing of this other than the Le Mans win.



Soundtrack ....from +3mins

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[quote=+8Rich]

Jaguar V12 engine is one of the most iconic powerplants ever produced by a British automaker, known for its smoothness, refinement, and unmistakable character.

They make a good coffee table too