Harley Milwaukee Eight 107 vs. 114: Update Your Engine

Harley-Davidson, one of the most popular motorcycle brands, recently announced a new 107 ci and 114 ci engine known as the Milwaukee-Eight. In its first release of the 2017 motorcycle certification data, the U.S. The environmental protection agency (EPA) confirmed the “9th generation” two upgraded engines – a 107ci (1746cc), and a 114ci (1868cc) as well. However, the EPA listed only a few bikes for each brand-new engine.

The motor takes its name from its birthplace and has twice as many valves as the “Twin Cam Engine,” which has been around since 1999. The New Harley-Davidson engine delivers more torque, faster throttle response, a smoother ride, better fuel economy, and improved fuel economy.

Harley Milwaukee Eight 107 Vs. 114, which is more likely to last longer between these two engines? Throughout this discussion, I will compare both engines and answer the question of which one can be matched with a minor investment. I am also responsible for the question of what the performance difference is and which can be worth the

A Brief Comparison Between Harley Milwaukee Eight 107 vs. 114

Harley claims the engines have a 10% increase in torque compared to previous models, but the factory didn’t release horsepower figures. Well, take a look at a short comparison below.

Harley Milwaukee Eight 107Harley Milwaukee Eight 114
92.53 horsepower100.57 horsepower
Engine Torque:- 111.4 ft-lb and 3250 rpmEngine Torque:- 124 ft-lb and 3250 rpm
Compression Ratio:- 10.0:1Compression Ratio:- 10.5:1
Fuel Economy:- Combined Highway/ City 45 mpgFuel Economy:- Combined Highway/ City 43 mpg
Smaller engine than 114Quite bigger than 107
Stroke is a little bit shorterStroke is a little bit longer
Sequential Port Fuel Injection for Fuel System (ESPFI)Sequential Port Fuel Injection for Fuel System (ESPFI)
2 into 2 staggered:- An exhaust catalyst2 into 2 staggered:- An exhaust catalyst

Harley Davidson Milwaukee-Eight Engine Include More Features

Harley has also confirmed that each head will have 4 valves, hence the name “Eight” (Milwaukee stands for the obvious):

  • Improved cooling and a reduction in heat due to repositioned exhaust pipes.
  • Idle speed is lowered from 1000 to 850 rpm.
  • The engine profile is slimmer.
  • Reduces clutch effort by 7% with help from the assist and slip clutch.
  • At idle, a 75% reduction in vibration is provided by an internal counterbalancer.
  • Improved drivetrain components, including a single camshaft, lighter valves, improved cover designs, and reduced powertrain noise.
  • Designed to minimize engine air intake noise and maximize the air flow.
  • Capable of providing 50 percent more electric power at idle for touring vehicles.
  • The Harley-Davidson Big Twin engine has been improved and maintained the heritage of its predecessor.
  • The cylinders have four valves each, a single chain is driven cam, dual plugs, counterbalanced, and rubber-mounted.

Complete Overview Of Harley Milwaukee Eight 107 vs. 114:

Millions of miles and countless hours of testing have proven this system. Each part of the engine is updated and engineered to deliver more performance. Power and a classy look. A totally new experience awaits you on this ride.


There are 107 engines using precision oil-cooled cylinder heads, available in Street Glides, the Electra Glide Ultra Classic, Road Glides, and Freewheeler trikes as well.

Ultra Limited models, the Road Glide Ultra, and the Tri Glide will be offered in a Twin-Cooled version featuring liquid-cooled cylinder heads and radiators.

On the CVO Limited and Street Glide, you’ll find the twin cooled Milwaukee Eight 114 engine featuring liquid cooled radiators and cylinder heads.

Increase Performance

With an increased displacement, the Milwaukee-Eight is a better alternative to the Twin Cam 103 or 110. A new motor will offer riders quicker acceleration off the line (about 8-11 percent faster at 0-60 mph) and during top gear (around 11-12 percent faster at 60-80 mph).

When stopped, the Milwaukee-Eight’s rubber-mounted counterbalancer cancels 75 percent of initial vibration, which makes stopping less of an eye-shaking experience.

Heat management can be improved by repositioning or relocating the exhaust pipe and relocated catalytic converter, as well as maintaining precision cooling of the cylinder heads.

Improved Acceleration

All of Milwaukee-Eight’s extra power directly contributes to improved acceleration performance since it weighs the same as the engines it replaces. Compared to the Twin Cam High Output 103, the Milwaukee Eight 107 accelerates faster from 0-60 mph by 11 percent. Equivalent to about two to three bike lengths, and 11 percent faster from 60-80 mph in high gear, which is about one to two bike lengths.

However, 0-60 mph acceleration is 8 percent faster on the Milwaukee-Eight 114, 60-80 mph acceleration is 12 percent more quickly on the Twin Cam 110.

Engine  Specifications:

Harley Milwaukee Eight 107

  • Twin cooled Milwaukee eight 107
  • Bore:- 3.937 inches
  • Stroke:- 4.375 inches
  • Displacement:- 107 cu inches
  • Compression Ratio:- 10.0:1
  • The ESPFI system is part of the fuel system of the vehicle

Harley Milwaukee Eight 114

  • Engine:- Twin cooled Milwaukee eight 114
  • Bore:- 4 inches
  • Stroke:- 4.5 inches
  • Displacement:- 114 cu inches
  • Compression Ratio:- 10.5:1
  • The ESPFI system is part of the fuel system of the vehicle

Performance Specifications:

Harley Milwaukee Eight 107

  • Testing torque on engines J1349
  • Engine torque:- 111.4 ft-lb
  • Engine torque:- 3250 rpm
  • Right lean angle:- 32 degrees
  • Left lean angle:- 31 degrees
  • Highway/city fuel economy:- 45 mpg

Harley Milwaukee Eight 114

  • Testing torque on engines J1349
  • Engine torque:- 124 ft-lb
  • Engine torque:- (rpm) 3,250
  • Right lean angle:- 34.3 degrees
  • Left lean angle:- 33.4 degrees
  • Highway/city fuel economy:- 43 mpg

More Power

This engine replaces the one in touring models, Milwaukee-8 engines produce 10 percent more torque. Besides having a larger displacement, Milwaukee-Eight engines have higher compression ratios, four-valve head designs, and more exhaust and intake airflow.

The factory sets valve lash for life, so there is no need to adjust the valve train. The Harley Milwaukee Eight 107 and Harley Milwaukee Eight 114 offer strong low-end torque combined with a broad, smooth power curve that’s perfect for touring motorcycle riders.

Reduced Vibration

For a more refined ride, the Harley Milwaukee Eight 107 and 114 rubber-mounted engines feature an internal counterbalancer that cancels 75 percent of primary vibration while riding. The V-Twin engines of Harley-Davidson also offer enhanced comfort for riders and passengers while maintaining the classic character of these engines.

Temperature Control

By reducing heat absorption, increasing heat rejection, and redesigning the exhaust system, the Milwaukee-8 engine offers enhanced rider and passenger thermal comfort. Using the targeted flow of liquid coolant or The cylinder heads are oiled around the hottest parts, every Milwaukee-Eight engine is precise in cooling based on the demands of the motorcycle model.

By adding knock sensors to each cylinder, the timing can be controlled more precisely. Heat is moved away from the passenger by relocating the exhaust pipe at rear and exhaust catalyst. Compared with Harley Milwaukee Eight 107 vs. 114_ from 1000 rpm to lowest 850 rpm, the idle speed is reduced.

Exhaust Note: Richer

Mechanical noise is drastically reduced by one camshaft, lighter valves, improved cover designs, and also upgraded driveline components. Air flows through the intake system and also air cleaner in a way that reduces noise.

Consequently, the new Harley Milwaukee Eight 107 and 114 engine features enhanced mechanical quietness, allows for the richer exhaust note, and satisfies global acoustics and emission standards while maintaining an audible rumble from its exhaust.

Harley Milwaukee Eight 107 Vs. 114, What Should I Go For Over Others?

107 Vs. 114, both are Harley Davidson products, so there is no doubt about quality and performance. Both engines emit the exhaust with richer sound thanks to reduced mechanical noise. Furthermore, the motor company machine features a 50% faster charging speed for its accessories and a slimmer air cleaner and primary covers for increased legroom.

From a rider point of view, I prefer the one 114 as a rider because it delivers power smoothly. Although it feels steady, instantaneous, and has a tidal rate of waves, it isn’t terrifying. It feels like the 107 is a bit snappier. Select your preference now.


Is the Milwaukee-Eight air-cooled?

As part of the CVO line, Milwaukee-Eight 114 Twin-Cooled models come with air and liquid cooling. Regardless of which engine you choose, the Milwaukee-Eight provides improved cooling compared to other engines, so you can ride cooler.

Why does the Milwaukee 8 have 4 spark plugs?

There are four valves per cylinder in the new engine, and it is an upgrade over current Harley engines. According to the company, spark plugs with double plugs per cylinder improve combustion efficiency. Moreover, a chain-driven camshaft is lighter and quieter.

How tight should Harley spark plugs be?

Heat transfer is assured by properly tightening spark plugs to the specified torque. Spark plugs should be tightened to a torque of 11-18 ft-lbs, (15-24 Nm) per plug.

What is the difference between a 103 and 107 Harley engine?

With the Milwaukee Eight 107, you can accelerate from 0-60 mph 11% quicker and 60-80 mph 11% quicker than the Twin-Cam High Output 103.

Last Words

With their iconic look, unique sound, and incredible torque, Harley-Davidson V-Twins are instantly recognizable, but the Milwaukee Eight 107 and Milwaukee Eight 114 engines take them to new heights. Harley Milwaukee Eight 107 vs. 114, what’s the best one and more powerful?

Both are the most powerful and coolest motor Harley Davidson has ever produced. It is also stronger, smoother, and more durable. The throttle response is crisper, and the sound is cleaner. Here’s your chance to hold onto freedom.

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