AWESOME Scale Running Model of Harley Engine

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Ron Colonna is the builder of this great miniature engine. This engine seems small, but sounds like the full size engine. It was built from the ground up for a 40% scale of the real thing. The bottom end was taken from a drawing of a Knuckel head engine. The top end was designed by looking at photos of actual Harley parts.

This Panhead (the type used by Harley-Davidson from 1948-65) is a two-fifths or 40 percent scale model, which is "large enough to produce that lovely V-twin sound," according to Colonna. He took the crankcase and lower end design from a set of Knucklehead drawings found on Bay, while the Panhead-style OHV top half was copied from photos, and an old Harley service manual helped him with the oil system.

As with all of Colonna's magical miniatures, his Harley little big twin is a treat to both the eye and the ear. Video below.