Harley Davidson Motorcycle Engine History
Flathead: 1909-1936
Flathead: 1909-1936Getting it's title from the tell-tail flat vented tops that are recognizable at the top of each cylinder head, the Flathead motor did not have overhead valves. The valves ran besides the engine and opened moving upward straight into a chamber next to the combustion chamber. It was an easy concept with out using pushrods or rocker arms, and the cylinder head was actually a straightforward casting sporting a hole in it for the spark plug. The Flathead Harley motor established victory after victory in the motorcycle competitions of the twenties.
Knucklehead: 1936-1947
Previous to World War 11, Harley-Davidson constructed a brand-new overhead-valve, V-twin construction with knuckly looking valve covers. The fresh new power plant came in a 60 cubic in . (990 cc) version, together with a 74 cubic in .(1,200 cc) with the 60ci delivering roughly 40 hp and the 74ci at 45 hp. The current powerplant, nicknamed the "Knucklehead", would be a solid performer for Harley and for America through the rough WW11 years.
Panhead: 1948-1965
Labeled for the pan-like valve covers which upgraded the knuckle pattern covers, the latest engine innovation was available in 60 cubic inch (990 cc) and 74 cubic inch (1,200 cc) varieties like the previous Knucklehead. Utilizing innovative products including light weight aluminum heads combined with hydraulic valve lifters which supplied oil through rocker arms using internal oil lines these motors grew horsepower to 50 and 55.
Shovelhead: 1966-1983
By 1966 the Panhead experienced added gains and now were available in a 74 cubic inch (1,200cc) engine that made 60 horsepower. The most notable alteration was the distinctive enclosed cylinder head inside a sleek, slightly curved top. Examining the the latest engine style it's easy to understand how it gained the Shovelhead name using pushrod pipes that appeared to be a shovel handle connecting to the head.
Evolution: 1983-1999
In 1984 the corporation goes public, has a employee buyout, and introduces it's cutting edge radical V-twin creation known amongst Harley Davidson fans as "the Blockhead". The latest powerplant employs styled square blocks to accommodate the valve train and has also a displacement of 81.8 cubic inches (1340cc) which makes 70 horsepower. Although the 1340cc is no longer being built today, the Sportster line is still being outfitted having 883cc and 1200cc Evolution engines.
Twin Cam 88: 1999-Present
Harley brings out it's most ground-breaking and largest sized powerplant yet at 88 cubic inches (1,459cc) that produces 80 horsepower. The new structure features larger heads to implement two cams as an alternative to 1 earning it the nickname of "Fathead". The new motor continues to be air cooled and utilizes overhead valves. In 2000 a totally new version of the motor is brought out that makes use of counterbalancing shafts that lessen engine vibration and is called the 88B motor.
Revolution Engines
Beginning in 2001 Harley brings out the revolution powerplant for the cutting edge VRSC V-rod model. Despite the fact that they have had considerable alternation in the past, this all new engine is different. It will be the very first water cooled Harley engine developed as an alternative to air cooled, and possesses a V angle of 60 degrees instead of 45. It's fuel injected and makes use of 4 overhead cams. While the new revolution engine is smaller at 69 cubic inches (1130cc), it works with a much shorter stroke enabling it to be able to rev to 9,000 RPM and create 115 horsepower.
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