DAYTONA, FLA., MARCH 9—Indian Motorcycle announced the all-new Thunder Stroke 111 engine that will power the model year 2014 Indian motorcycle on March 11 during Daytona Bike Week at Dirty Harry’s Bar on Main Street. The Thunder Stroke 111 marks another milestone in the company’s drive towards a full launch later this year under the stewardship of Polaris Industries.

Indian Motorcycle's all-new Thunder Stroke 111
Indian Motorcycle’s all-new Thunder Stroke 111

Since the April 2011 acquisition of Indian Motorcycle by Polaris Industries, the company has made a commitment of time, resources and passion into the design of the all-new powerplant. The goal was to capture the iconic design and styling aspects of the 112-year-old brand’s most historic models and fuse that heritage with state-of-the-art technology and progressive design elements. The new design reflects an investment into searching the complete history of Indian Motorcycle powertrain development, including the review of volumes of historical documentation, miles of riding vintage motorcycles, and studying and dissecting a broad array of legendary Indian Motorcycle models.

The Thunder Stroke 111 engine features a 111 c.i. displacement and delivers more than 115 ft lbs of torque from the 49-degree V-twin engine that marks the first clean-sheet Indian Motorcycle engine design in seven decades. With parallel pushrod tubes, finned heads, down firing exhausts, left side air intake, and the proportions and layout familiar to Indian Motorcycle fans around the world, Indian believes the Thunder Stroke 111 is sure to inspire both experienced and new riders.

Engine Overview

Indian Motorcycle's all-new Thunder Stroke 111
Indian Motorcycle’s all-new Thunder Stroke 111

Displacement: 111 c.i. (1811 c.c.)
Engine Torque: More than 115 ft-lbs (160 N*m)
Engine Type: 49 deg V- Twin
Cooling system type: Air Cooled with Integrated Oil Cooler
Idle speed +/-50rpm: 800 RPM
Max Engine speed: 5500 RPM

Valves per cylinder: 2
Actuation: Three-Cam, Push-rod, OHV
Lifter Type: Hydraulic
Compression Release: Yes
Bore: 3.89 in (101 mm)
Stroke: 4.45 in (113 mm)
Target Compression Ratio: 9.5: 1
Balancer Type: Helical Gear Primary Balancer

Indian Motorcycle's Thunder Stroke 111 engine
Indian Motorcycle’s Thunder Stroke 111 engine

Drive Train
Primary Drive Gear: 55/86 ratio
No. of Ratios: 6-speed Overdrive constant mesh
Spur/Helical: 1st Spur, 2-6 Helical
Gear Ratios (overall):
1st 9.403
2nd 6.411
3rd 4.763
4th 3.796
5th 3.243
6th 2.789
Final Drive: Carbon Fiber Reinforced Belt 30/66 ratio
Clutch Type: Multi-plate, Wet clutch, Integral Damper

CAD designs showing the all-new Thunder Stroke 111's moving inner parts
CAD designs showing the all-new Thunder Stroke 111’s moving inner parts

Fuel Induction system
Throttle actuation: Electronic Throttle Control
Throttle Diameter: 2.13 in. / 54 mm
Fuel Delivery type: Electronic Sequential Port Fuel Injection
Fuel Type: Premium recommended

Lubrication system
Oil Type: 20W-40
Sump type: Semi-dry


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