The original Harley-Davidson Twin Cam 88 engine had a displacement of 1,450 cc.
Harley-Davidson introduced the Twin Cam 88 engine for the 1999 model year. Its “88” designation referred to its displacement of 88 cubic inches, equivalent to approximately 1,450 cc. The engine replaced the Evolution engine in most larger Harley-Davidson motorcycles.
The Twin Cam name referred to its two camshafts, a departure from the single-cam arrangement used by the Evolution engine. The engine also incorporated other revisions intended to increase performance and durability while preserving Harley-Davidson’s traditional air-cooled V-twin character.
Later Twin Cam versions grew larger. The Twin Cam 96 measured 1,584 cc, while the Twin Cam 103 measured 1,690 cc. Those later figures explain why the original 88-cubic-inch engine is sometimes confused with the larger members of the same family.