Indian’s new liquid-cooled PowerPlus 108 V-twin has DOHC with 4 valves per cylinder and makes a claimed 128 lb-ft of torque and 122 horsepower.

Indian has unveiled the all-new liquid-cooled PowerPlus 108,
a 1,768cc (108ci) V-twin that makes a claimed 128 lb-ft of torque and 122
horsepower and will be the beating heart of a new fixed-fairing bagger called
the Challenger.

Rider got a chance
to see and experience the PowerPlus 108 during a multi-day, hush-hush ride on
the Challenger, and we?ll post a full review when the embargo lifts on Tuesday,
October 29. For now, we can only reveal details about the new engine.

With ever-tightening emissions regulations, the era of
air-cooled engines is drawing to a close. Euro 5 standards, which go into effect on January 1, 2020, further reduce limits for carbon monoxide, hydrocarbons
and nitrogen oxides, and adapting air-cooled engines to meet these standards
will become increasingly difficult.

Unlike the liquid-cooled Scout engine its based on, Indian’s new PowerPlus 108 V-twin has a nod to traditionalists with small cooling fins near the tops of its cylinders.

Indian?s air-cooled Thunder Stroke 111/116 V-twin has powered all of its heavyweight baggers and tourers since it debuted for 2014. Rather than implement partial liquid cooling like Harley-Davidson did with its Twin-Cooled Milwaukee-Eight V-twin and BMW did with its R-series boxer twin, Indian decided to go all-in with liquid cooling for the PowerPlus 1...