The Royal Enfield Sherpa 450 engine powers the all-new Royal Enfield Himalayan, with Royal Enfield’s first liquid-cooled engine.
The Royal Enfield Sherpa 450 engine is bigger than the outgoing LS 410 engine, with engine displacement increasing to 452 cc from 411 cc. It also is RE’s first liquid-cooled engine, replacing the air-cooled 411 cc engine of the outgoing Himalayan.
In numbers, the Sherpa 450 makes 39.5 bhp at 8,000 rpm and 40 Nm of peak torque at 5,500 rpm. Comparatively, the LS 410 makes 28 bhp at 6,500 rpm and 32 Nm at 4,000-4,500 rpm.
The Sherpa 450 is almost square, with 84 mm bore and 81.5 mm stroke (with a bigger bore and shorter stroke than the LS 410 engine). The top-end has also been completely changed with the Sherpa 450 implementing a four-valve head with double overhead camshaft (DOHC).
The new engine uses an aluminium barrel which allows reduced piston clearance. The forged piston and plated bore allow for high piston speed and high cylinder pressures. A semi-dry sump has been incorporated to reduce frictional and pumping losses in the crank, and DLC (diamond-like carbon) coating has been incorporated as well in critical parts of the valvetrain.
With all the changes in the new Royal Enfield Sherpa 450 engine, there should be a considerable advantage in performance. Idle speed of the Sherpa 450 is 1,300 rpm and maximum engine speed is 8,750 rpm, with the torque curve showing a wide usable band spanning 3,000 rpm and 8,000 rpm.
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