Royal Enfield’s new 450cc single cylinder engine is all set to power the new Himalayan
Royal Enfield introduced their new powerhouse, the Sherpa 450 engine, set to power the upcoming iteration of the renowned Himalayan series. With a robust 452 cc liquid-cooled design, the Sherpa 450 engine represents a significant departure from the previous LS 410 model. Delivering an impressive 65% increase in peak power, a 25% boost in peak torque, and a 25% higher maximum engine speed, this engine marks a substantial leap in performance capability. Its advanced engineering incorporates an angled cylinder design, enabling the engine to function as a stressed chassis member. This engine is poised to redefine the performance standards of the new Himalayan, let us learn more about it.
Bigger engine, More power
The latest iteration of the Royal Enfield, the Sherpa 450, boasts a larger size than its predecessor, the LS 410, now housing a 452 cc displacement as opposed to the former 411 cc. An innovative shift for Royal Enfield, the Sherpa 450 marks the brand’s transition to a liquid-cooled engine, a departure from the air-cooled 411 cc engine found in the previous Himalayan model. In terms of output, the Sherpa 450 generates 39.5 bhp at 8,000 rpm and a peak torque of 40 Nm at 5,500 rpm. In contrast, the LS 410 produces 28 bhp at 6,500 rpm and 32 Nm at 4,000-4,500 rpm. Additionally, the Sherpa 450 incorporates a slip and assist clutch accompanied by a new 6-speed transmission. The Performance mode is tailored to deliver maximum power, while the Eco mode aims to soften throttle response and reduce power output in the initial four gears.
The latest engine implementation introduces an aluminum barrel that facilitates a reduction in piston clearance. By utilizing a forged piston and plated bore, the engine achieves heightened piston speed and sustains elevated cylinder pressures. Furthermore, the integration of a semi-dry sump serves to diminish frictional and pumping losses within the crank system, while critical components of the valvetrain now feature DLC (diamond-like carbon) coating. These modifications collectively contribute to a reduced overall weight by 10 kg, enhanced thermal efficiency, and the adoption of a higher compression ratio (11.5:1), culminating in improved performance and increased power output.
Square stroke architecture:
The fundamental structure of the Sherpa 450 has undergone significant alterations. In contrast to the long-stroke (LS) 410 engine, the Sherpa 450 exhibits an almost square design, featuring an 84 mm bore and an 81.5 mm stroke, signifying a larger bore and shorter stroke than its predecessor. Notably, the top-end configuration of the Sherpa 450 has been entirely revamped, integrating a four-valve head with a double overhead camshaft (DOHC), a departure from the previous 2-valve, SOHC setup found in the LS 410. Additionally, the implementation of a hydro-mechanical cam chain tensioner aims to reduce engine noise and provide a more seamless operational experience.
Wider Rev Range:
The revamped Royal Enfield Sherpa 450 engine brings significant performance advantages. It idles at 1,300 rpm and reaches a maximum engine speed of 8,750 rpm, showcasing a broad torque curve spanning from 3,000 rpm to 8,000 rpm, ensuring a wide and usable power band. Overall, it delivers a remarkable 65% increase in peak power, a 25% boost in peak torque, and a 25% rise in maximum engine speed compared to the LS 410 engine.
Not only is the Sherpa 450 engine is lighter, but it’s also engineered with an angled cylinder design. This design not only allows the engine to serve as a stressed member of the chassis, reducing chassis mass, but also enables repositioning of the catalytic converter, silencer, and airbox. These strategic adjustments have effectively positioned the overall mass of the engine as low and forward as possible.
Additionally, the high-power (418V) alternator is poised to support various electrical accessories, including auxiliary lights, promising enhanced functionality and expanded electrical capabilities.
The Royal Enfield Sherpa 450 engine presents a significant leap in power and performance, poised to elevate the new Himalayan’s capabilities. Our anticipation is set as we eagerly await the opportunity to experience firsthand the engine’s prowess when integrated into the new Himalayan when we get the chance to ride it.