Harley-Davidson 107 and 114 Engines
Harley-Davidson has announced an all-new 107 ci and 114 ci engine called the Milwaukee-Eight.
Since replacing the Evolution engine in 1999, the Harley-Davidson Twin Cam has progressed over the years from the original 88ci (1450cc) to the 95ci (1550cc) through the 96ci (1584cc) to the 103ci (1690) and 110ci. (1801cc). . But after 17 years of dominance, the 45-degree V-Twin was rumored to be replaced.
The U.S. Environmental Protection Agency (EPA) first released its 2017 motorcycle certification data, confirming two new engines: a 107ci (1746cc) and a 114ci (1868cc) engine. However, the EPA only had a few bikes listed for each new engine.
On Tuesday, Harley updated us with the following information, also confirming the “Milwaukee-Eight” name for the new engine:
The new Milwaukee-Eight engines will power all 2017 Harley-Davidson Touring and Trike motorcycle models. The Milwaukee-Eight engines will be offered in two displacement and three variations:
Milwaukee-Eight 107 (107 CID, 1750 cc) with precision oil-cooled cylinder heads for Street Glide / Street Glide Special, Road Glide / Road Glide Special, Electra Glide Ultra Classic, Road King and Freewheeler.
Milwaukee-Eight Dual Cooled 107 (107 CID, 1750 cc) with liquid-cooled cylinder heads for Ultra Limited / Ultra Limited Low, Road Glide Ultra and Tri Glide Ultra models.
Milwaukee-Eight 114 dual-cooled (114 CID, 1870cc) with liquid-cooled cylinder heads for CVO (TM) Limited and CVO (TM) Street Glide models.
Harley says the engines generate 10% more torque than previous versions, but the factory did not release the horsepower numbers. However, according to the EPA release, the new 107 produces 92.53 horsepower (69kw) at 5020 rpm, and the 114 produces 100.57 horsepower (75kw) at 5020 rpm for the 114.
Harley also confirmed that the engine will have four valves per head, hence the “Eight” in the title (Milwaukee means the obvious):
Each Milwaukee-Eight engine produces 10 percent more torque than the engine it replaces in 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 does not require adjustment as the rocker arm design allows 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, less mechanically complex, and generates less friction and noise.
“The Milwaukee-Eight engine retains the classic 45-degree Harley-Davidson V-Twin design,” said Alex Bozmoski, Harley-Davidson’s chief powertrain engineer, who led the development team. “It also retains the power characteristic that is the true legacy of the Harley-Davidson Big Twin: strong low end torque with a wide, flat midrange power curve that is ideal for the Touring rider.”
Harley reports that the Milwaukee-Eight accelerates 11% faster to 0-60 mph (two to three bike lengths) and 60-80 mph (one to two bike lengths) than the Twin Cam High Output 103. As for At 114, it accelerates 8% faster at 0-60 mph and 12% faster at 60-80 mph than the Twin Cam 110.
Harley says the new Milwaukee-Eight also arrives with:
- More accurate cooling and sheds less heat due to relocated tailpipes
- Idle speed reduced from 1000 rpm to 850 rpm
- Slimmer motor profile down
- Clutch assist and slip for 7% less effort on the clutch lever
- Reduced vibration due to a single internal counterbalance that cancels 75% of primary vibration at idle
- Powertrain noise reduction due to lighter valves, single overhead camshaft, optimized casing designs, and improved driveline components
- Engine air filter designed to reduce intake noise and maximize airflow
- 50 percent more idle charge for tourists’ battery power demands
- Enhanced sleek styling that “respects the heritage of previous Harley-Davidson Big Twin engines
This is the ninth large V-Twin in Harley’s lineup since 1903:
- F-Head (1914-1929; 61ci and 74ci)
- Flathead (1930-1948; 74ci and 79ci)
- Knucklehead (1936-1947; 61ci and 74ci)
- Panhead (1948-1965; 61ci and 74ci)
- Ironhead (1957-1985) (54ct and 61ci)
- Shovelhead (1966-1984; 74ci and 80ci)
- Evolution (1984-1999; 80ci)
- Twin Cam (1999-2016; 88ci, 95ci, …