The Harley-Davidson Twin Cam, also called “Fathead”, is an air-cooled 45 ° V-twin engine, 2 overhead valves per cylinder and has two cams in the crankcase (hence the name), initially powered by a single carburettor and subsequently electronic fuel injection, produced by Harley-Davidson since 1998 and discontinued in 2017. Initially it had a displacement of 1,450 cm³ (88 cubic inches) that raised to 1,801 cm³ (110 cubic inches) in the CVO (Custom Vehicle Operations) series motorcycles. In 2016 the Twin Cam 110 equipped the Dyna Low Rider S and Fat Boy S models.
From the performance point of view, the Twin Cam had a non-linear history: good the 1,450 cm³ (88 ci), not bad 1,580 cm³ (96 ci) with compression ratio lowered to 9.2: 1 and with the first gearbox at 6 gears, better the 1,690 cm³ (103 ci) that was improved with the High Output versions and finally the 1,801 cm³ (110 ci) which stands above all.
The following graph is the dyno chart after the tuning of Dyna Low Rider equipped with the 2: 1 Thunderheader exhaust.
The Twin Cam has been discontinued but it s still alive and vibrant!
