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John O | September 2016

Harley-Davidson Launches All-New Milwaukee-Eight Engine


on august 23, harley-davidson announced its first new engine design in nearly two decades and just the ninth big twin in its history. the milwaukee-eight™ engine will be the centerpiece of harley’s 2017 touring motorcycle lineup, according to a press release from the company, and was based on a number of improvements called for by customers.

 

among the changes introduced in the new engine, which was first displayed to customers on facebook live, were 10 percent more torque than its predecessor and four-valve cylinder heads that offer 50 percent more intake and exhaust flow capacity.

 

harley-davidson_road_king_custom_2006_600

 

in addition, and what is most interesting to coolingzone, is a focus on the thermal comfort of riders. according to alex bozmoski, harley’s chief engineer of new products, and paul james, harley’s director of motorcycle product planning, in an interview with mark masker of www.motorcyclecruiser.com, harley-davidson put a premium on engineering heat management into the new line of bikes.

 

the engineers described thermal management as the biggest hurdle that they faced in the new design.

 

“there are so many sources that can go south and so many conditions to consider when dealing with heat in motorcycling, from being in traffic to in a parade, hot out, cold out, crosswinds, and more,” said james and bozmoski. “heads get hot, you have cylinder fin radiation, and so on. wider or thinner tires in front give you different air movement. shooting the gap with all these models to make sure each is a pleasant riding experience—it’s tough.”

 

wind tunnels were used extensively in the design process to determine whether the new touring motorcycles would provide the comfortable ride that customers demanded. engineers also tested out a personal fan for drivers but were sure that the new design worked and left the fan off to be added only as extra accessory.

 

there was also a change in the sensors that are used to measure the charge in the cylinder after combustion in the spark plugs. the previous model used ion sensors but the new design uses accelerometer-based sensors, which provide increased accuracy. this leads to better thermal management and fuel economy, according to bozmoski and james.

 

engineers also dropped the idle on the milwaukee-eight™ from 1,050 rpm to 850 rpm. where the older model would create 17 amps at 1,050 rpm, the new model can create 24-25 amps at an idle of 850 rpm and more than 30 amps at 1,050 rpm. to manage this increase in current, the designers used more and heavier windings to avoid overheating and also added oil cooling to the rotor.

 

to read the full interview with alex bozmoski and paul james, go to http://www.motorcyclecruiser.com/harley-davidsons-new-engine. the full details of the new milwaukee-eight™ can be found at www.harley-davidson.com.

 

watch a video of the new engine below:


Harley-Davidson Milwaukee Eight - Design by motorcyclecruiser

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