Polaris-owned Indian has been teasing their all-new motor for months now; this past weekend, they finally unveiled it.
Those who were hoping for a throwback to Indian’s straight-four history, or maybe something modern and water-cooled, were all disappointed. The new Thunder Stroke motor is an air-and-oil cooled 49-degree 1818 cc V-twin, making more than 115 ft.lb of torque. It’s true, though, that it takes a lot of engineering just to get a motor like this past EPA and other government regulatory bodies these days.
Fuel comes from electronic sequential port fuel injection and electronic throttle control. There’s three camshafts and a forged crankshaft, pushrods, and two valves per cylinder with hydraulic valve lifters to reduce maintenance. Compression ratio is 9:5, and the transmission is a six-speed constant mesh unit with helical gearbox.