Patent Filing Reveals New Harley-Davidson Pushrod Engine Design

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By Dennis Chung

It’s been a pretty busy week for Harley-Davidson, announcing its 2020 model lineup and holding its annual dealer meeting in Milwaukee. Judging from our readers’ comments, the news hasn’t been too impressive, with the highlights including the return of the Low Rider S, a new $48k CVO Tri Glide and the disappearance of a few notable models. For most of Harley’s returning lineup, the only updates are new colors and, for touring models, a new, optional suite of electronic rider aides. Those hoping for news of the Pan America or Streetfighter will be disappointed to hear Harley’s new liquid-cooled DOHC platform is still not ready for production.

While we wait for the new liquid-cooled engines, can report that development for the follow-up to Harley-Davidson’s Milwaukee-Eight engine is well underway. A new patent application filed in February, but only published this week by the U.S. Patent and Trademark Office, reveals Harley-Davidson is working on a new overhead valve system for a V-Twin engine that claims higher engine speeds than the current Milwaukee-Eight.

The most obvious visual change is the positioning of the two pushrods on either side of the cylinders instead of together on one side on Harley’s existing engines. The current engine uses the pushrods to move a pair of rocker arm shafts, one to open the two intake valves and the other opening the two exhaust valves.

The current M-8 engine uses a pair of shafts, each with two rocker arms to manipulate the valves.

New Harley-Davidson Pushrod engine

The new engine design has the two pushrods each directly moving …read more

Source:: Patent Filing Reveals New Harley-Davidson Pushrod Engine Design


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