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All-new Royal Enfield 650cc Parallel-Twin Engine Revealed

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Royal Enfield unveiled its first modern twin-cylinder engine at its new Technology Centre in Leicestershire, England, today. This new Royal Enfield 650cc, air-cooled parallel twin will power the newest generation of RE motorcycles. The core idea behind the modern 650 twin engine was to develop a global platform that would carry the Royal Enfield legacy and character into a modern context. The engine has been designed to offer the right balance between power, torque and usability so as to ensure a smooth and unintimidating riding experience. It will offer a broad spread of torque which will make the motorcycle easy to ride without frequently shifting gears.

The Royal Enfield 650cc platform is a 4 stroke, single overhead cam, air-cooled, 648cc parallel twin cylinder engine developed by Royal Enfield’s UK Technology Centre and Chennai teams. Engineered to be able to accelerate and deliver higher power and torque at lower RPMs, this new engine has an output capability of 47bhp and 52Nm torque. This makes the ride experience hassle-free and smooth. A highly refined engine, with true highway capability, the 650 twin engine has been developed to excel across a wide range of real-world conditions. Classically styled, the engine has been designed to achieve a high level of modern refinement. The twin pipes and the cooling fins on the classic air-cooled engine render a visual impact.

The Royal Enfield 650cc engine maintains an under-stressed 9.5:1 compression ratio and the fuel injection system ensures that smooth, accessible power is available at all times. The focus of the development was on giving adequate torque, spread broadly throughout the rev range so that riders can tap into it instantly at any time without the need for excessive shifting. As a result, the engine feels fun, potent, and easy-to-use. Making this possible are a number of elements, starting in the very depths of the engine where there is a single-piece forged crankshaft (a first for Royal Enfield) which ensures strength and the ability to handle the twin’s torque. This crankshaft uses a 270-degree firing order, which gives a high degree of character to the engine’s power delivery. Also, thanks to the use of a balancer shaft, unwelcome vibrations have been eliminated.

Using ambient air-flow combined with engine oil to keep engine temperature at an optimal level means that a radiator, fan, hoses, and other components are unnecessary. This keeps the Royal Enfield 650cc motor beautifully clean and essentially pure, like the experience it provides. Just as relevant as the engine’s individuality, is its sound. The characteristic ‘thump’ of Royal Enfield’s singles is cherished by legions of enthusiasts, and great lengths were taken to ensure that the new 650 twin gives an equally compelling soundtrack. Hours were spent tweaking every contributing variable to engine sound, resulting in twin silencers that rumble with just the right tone.

The entire platform, including the engine and chassis, have undergone rigorous testing during the development programme. It has been subjected to lab and bench tests, in addition to being tested on proving grounds, race tracks and public roads.

Engine Specifications

 

Type

4 stroke, 270-degree crank, single overhead cam, air-oil cooled, 648cc parallel twin

Power

47bhp @ 7100rpm

Torque

52Nm @ 4000rpm

Bore x Stroke

78mm x 67.8mm

Compression Ratio

9.5:1

Gearbox

6 speed

Fuel Management

Fuel injection

Ignition

Digital spark ignition – TCI

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