Harley Release More Info On The Milwaukee Eight Engine!

Harley Gives Us The Details On THe Milwaukee Eight Engine!

Updated August 14, 2018

Not only have Harley Davidson released more information about their new Milwaukee Eight engine, they’ve also given us a sneak peak at their 2017 range of touring machines. Each of the new models will be powered by the Milwaukee Eight engine. The 1753cc big twin will be the defining feature of the 2017 H-D Road King, the Street Glide Special, the Road Glide Special, and the Road Glide Ultra models.

Milwaukee Eight Engine Details 1

The new air cooled V-twin engine comes with some rather stunning cylinder heads, and a smaller waist. It also carries four valves per head for increased air flow, and a cleaner exhaust sound. According to Harley Davidson, the Milwaukee Eight will offer more torque and a better fuel economy than ever seen before on Harley Davidson machines.

Milwaukee Eight Engine Details 2


Milwaukee Eight Engine Details 3

The Milwaukee Eight will also come in three different versions: a standard air cooled V-twin, and a “twin cooled” version, and a bigger “twin cooled” 1870 cc arrangement. By “twin cooled” they mean using liquid cooled cylinder heads. We’ve got some videos for a better explanation, and this release from Harley Davidson:

Each Milwaukee-Eight engine produces 10 percent more torque than the engine it replaces in the Touring models. In addition to increased displacement, the Milwaukee-Eight engine features a higher compression ratio and four-valve cylinder heads with 50 percent more intake and exhaust flow capacity. The valve train requires no adjustment as the design of the rocker arms enables valve lash to be set at the factory for life. Dual spark plugs for each cylinder contribute to more- efficient combustion. A single chain-driven camshaft is lighter, mechanically less complex and creates less friction and noise.

“The Milwaukee-Eight engine retains the classic Harley-Davidson 45-degree V-Twin design,” said Alex Bozmoski, Harley-Davidson Chief Powertrain Engineer, who led the development team. “It also retains the power characteristic that is the real legacy of the Harley-Davidson Big Twin: strong low-end torque with a broad, flat power curve through the mid-range that’s ideal for the Touring motorcycle rider.”

The Milwaukee-Eight also comes with:

  • More precision cooling and throws off less heat due to re-positioned exhaust pipes
  • Lowered idle speed from 1000 rpm to 850 rpm
  • Slimmer engine profile down
  • Assist and Slip Clutch for 7% less effort at the clutch lever
  • Reduced vibration due a single internal counter balancer that cancels 75% of primary vibration at idle
  • Reduced powertrain noise due to lighter valves, a single camshaft, optimized cover designs and improved driveline components
  • Engine air cleaner designed to reduce intake sound and maximize air flow
  • 50-percent more charging at idle for battery power demands of tourers
  • Improved sleek styling that “respects the heritage of the previous Harley-Davidson Big Twin engines.”

The 2017 Touring line up will also come with upgraded suspension, including new forks and shock absorbers. The front forks will now come equipped with variable orifices for the damping valves to increase stability. The rear shocks will come with tool-free damping adjustment and an adjustable ride height.

Milwaukee Eight Engine Details 4

Anyway, if you want to experience the all new Milwaukee Eight in all of its configurations and all of its glory, here’s a quick overview of what bike gets what engine…just so you’re ready for when they hit the dealerships:

The Milwaukee Eight 107 (1753cc) will be available for the Street Glide, Street Glide Special, Electra Glide Ultra Classic, Road King, Road Glide and Road Glide Special, and Freewheelers.

The “Twin Cooled” Milwaukee Eight 107 (1753cc) with liquid cooled cylinders will power the Ultra Limited, Ultra Limited Low, Road Glide Ultra and Tri Glide Ultra machines.

The “Twin Cooled” Milwaukee Eight 114 (1870cc) – also liquid cooled – will be available for the CVO Limited and CVO Street Glide models.

Milwaukee Eight Engine Details 5

Milwaukee Eight Engine Details 6

We’re hoping to have a chat with Harley Davidson next week sometime, and we’ll let you know what we find out as soon as possible!


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Joe Appleton
About Joe Appleton

I’ve done a bit of work here and there in the industry – I’ve even ridden a few bikes for actual money but what it comes down to is this: I ride bikes, build bikes and occasionally crash ‘em too. I like what I like but that certainly doesn’t make my opinion any more valid than yours…

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