My entire engine set (over 120 images)
www.flickr.com/photos/gordoncalder/sets/72157612757443903...
The intake over exhaust (IOE) engine, also known as F-head and pocket valve, is a Four-stroke internal combustion engine of primitive design used in early Harley-Davidson motorcycles, beginning with the 1911 Model 7D. The design was also used in other motorcycles, and in car engines by various manufacturers.
The intake valves are "overhead" (located in the cylinder head) and operated by rocker arms and pushrods from the camshaft in the crankcase, while the exhaust valves are flathead (located in the cylinder or engine block) and operated by the camshaft without pushrods or rocker arms. This was a low compression design.
Harley-Davidson started the official H-D Service School in 1917 to teach motorcycle mechanics and maintenance to military personnel. It should be noted that roughly half of all the 1917 Harley-Davidson motorcycles were sold to the Army for messenger and traffic duties.
I believe this is a 65 cu in model
Harley Davidson Engine Timeline on Wikipedia
en.wikipedia.org/wiki/Harley-Davidson_engine_timeline
Original image pic taken at VMCC Banbury Run 2009.
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