It’s not very often we see The Motor Company introduce a completely new engine, so our ears pricked up when we learned the new Bronx, Pan America and as-yet-unnamed ‘flat tracker’ 2021 Muscle bike will feature the all-new Revolution Max engine.
While Harley bills the engine as ‘all-new’, it can be surmised that many engineering cues came from the earlier Revolution engine we first saw in the V-Rod nearly 20 years ago.
The engine is designed to fill the middleweight sector currently satisfied by the 45-degree, V-Twin Evolution engine (aka ‘Evo’) featured in the Sportsters since 1986.
The Revolution Max will initially be available in 975cc and 1250cc displacements and will be integrated into the motorcycle as a stressed member, enhancing centre of gravity and improving handling. While this, on its own, is not so ‘revolutionary’ but some other features will certainly raise the eyebrows of Harley diehards.
The Revolution Max will be liquid cooled. Apart from entry-level Streets, all other Harley-Davidson V-Twins are air-cooled, following Milwaukee’s long-standing tradition. The reasoning is that liquid cooling maintains a consistent engine temperature that, in turn, provides more predictable performance across variations in environment and riding conditions.
The other visual cue is that the V will be a 60-degree angle instead of the signature 45-degree. The reasoning for this design departure is to allow room for dual downdraft throttle bodies for maximum airflow and increased performance from the 8-valve architecture.
We also get power and torque data with the 1250cc version producing and most respectable 145hp (108kW) of power and 88Nm of torque - and with internal balancers, the engine can be expected to run smoother with substantially reduced vibration for enhanced rider comfort.
All going to plan, we should see the first Revolution Max powered models appear in late 2020.
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