Harley Milwaukee 8 Engine Parts

With every introduction of a new Big Twin comes a new era in the Harley-Davidson legacy. The introduction of the Milwaukee Eight has turned the page and has begun an all new chapter. The M8 is ushering in new Harley technology and performance where the previous Twin Cams could not reach. The Milwaukee Eight is now in all Big Twin bikes including Touring, Trikes and the new Softail lineups. The name is derived from this mill’s use of eight valves, four per cylinder. The all new powerplant is a bit of a departure from its predecessors in the fact that it utilizes tech that hasn’t been seen on the Big Twins.

For its first offerings, the Milwaukee Eight is offered in three unique configurations. The base engine is the M8 107 in, which features oil-cooled cylinder heads. Next in the lineup is the same 107 in displacement, but utilizes liquid-cooled heads, something not seen in previous Big Twins. The alpha dog of the lineup is the M8 114 in liquid cooled engine. The use of the engine is dependent on what model the engine is being placed in.

The new M8 mill is said to produce 10% more torque than the outgoing Twin Cams. This is in part due to the 8 valve setup, which is able to produce 50% intake and exhaust flow. More air flow equals more power. A dual spark plug per cylinder setup also helps to create more efficient combustion for an added pop and fuel efficiency. This engine uses a single, less complex camshaft, which is lighter and creates less noise than previous models. It weighs the same as its outgoing predecessor, which combined with its increased power makes it much quicker off of the line.

The M8 features many other upgrades that make the engine better. To reduce vibration, it is rubber mounted and utilizes a single internal counter balancer. This setup is claimed to eliminate 75% of the primary vibration at idle. Bikes equipped with the new engine also utilize a slip clutch to help reduce lever effort. With the new cooling setup and a relocated rear exhaust pipe, heat build-up is much less of a factor.

Thought the Milwaukee Eight is a great engine out of the crate, it can be made even better with the right aftermarket upgrades and repairs. At Dennis Kirk, you will find the best selection of Harley Milwaukee Eight engine parts to make your bike perform just the way you want it to. We keep the most in stock and ready to ship to you the same day that you order them. That way, you can get back out on the road as soon as possible. And when your order is over $89, we will ship it to you for free. Use the Ride Selector at the top of the page to find all of the engine parts that fit your specific Harley. Also, feel free to contact our knowledgeable Tech Team if you have any questions on what is best for you and your motorcycle.