Magnity

The Harley-Davidson Twin Cam 88 engine was released for the 1999 model year in September 1998. The Harley-Davidson Twin Cam 96 was released for the 2007 model year. Although these engines were the successors to the Evolution engine ("Evo"), they share a number of characteristics with nearly all previous Harley-Davidson engines. Both engines have two cylinders in a V-twin configuration at 45 degrees, are air-cooled, and control valve timing with push-rods. The crankshafts have a single pin with a tongue and fork arrangement for the connection rods. These are sandwiched between a pair of flywheels.

88B and 96B Engines

A police issue Twin Cam 96.

The Twin Cam wasn't initially used in the Softail model family before the year 2000. This was due to the chassis' design and issues with increased vibration. The increase in vibration was a result of the direct mounting of the engine to the Softail frame. Dyna models are "rubber mounted" and therefore do not suffer the same vibration problems. Harley then solved the issue by making a redesigned version of the Twin Cam, the Twin Cam 88B. The 88B is essentially the same as the original Twin Cam, but with a different engine block design and twin chain-driven counter-balancers. This had caused some controversy among Harley veterans, claiming that the "Harley vibes" were a part of their motorcycles. The Harley-Davidson Twin Cam 96B engine was released at the same time as the Harley-Davidson Twin Cam 96A model, for the 2007 model year, and is currently used on all Softail models