History of the Harley Davidson Sportster Crate Engine
The motorcycle giant Harley Davidson is known for producing both classy as well as performance-based motorcycles. The Harley Davidson Sportster Crate Engines are known for their power and performance. The Evolution engine which is part of the Harley Davidson Sportster Crate Engines is a V-Twin engine which is about 45-degree and is air-cooled. This engine which is commonly known as Evo was manufactured for the Harley-Davidson motorcycles of the year 1984. The Harley Davidson Sportster Crate Engines came as a replacement for the Shovelhead engines until the year 2000.
The displacement used to be 1340 cc for the company bikes, especially the Big V-twin bikes. This went on until the last Evo was used in the factory produced FXR4. The year 1999 saw the replacement of the Harley Davidson Sportster Crate Engines by the Twin Cam 88. This was used in the Dyna and the Touring model. Following this, it was later used in the Softail models during the year 2000. By the start of the year 1986, the Harley Davidson Sportster Crate Engines was made available in the Sportster models. This was made until the year 1988 with the displacement of 1100cc. This was continued to be made in 1200 cc as well as the 883 cc in the case of the Sportster models which came as a replacement for the ironhead Sportster engine.
Among the Harley Davidson Sportster Crate Engines, the Evolution engine was a big hit and was considered by many as the engine which literally saved the Harley brand as it was nearing bankruptcy. The official name for the engine was assumed by many as the company's attempt to reform their brand image. This was due to the management buyout during the year 1981 from the earlier owner American Machine and Foundry. When talking about the Harley Davidson Sportster Crate Engines, the heads and cylinders are made out of the metal aluminum. This is basically to reduce the weight which will happen on a major scale when in comparison to the cast iron design.
When looking into the blocky rocker boxes, the aluminum cylinders, and heads considered to be the only useful element of the Evolution engine. The models Big Twin and Sportster incarnations seem to be considerably different. The Sportster model had some unit construction which was retained right from its time of inception which was used as the side-valve till the Evolution engine which was upgraded in 1986. This paved way for a unique valve train configuration. While many other major engine types in the market now, the Sportster Evolution engine does use only one cam for one engine overhead valve. This leads to four individual gear-driven camshafts which have single-lobe.
Due to this positioning, the cam lobes are located one after another, whereas the pushrods are placed in pairs which as a result are located parallel to the cylinder axis. The engine Evolution Big Twin was present in the company for a fifteen year period and was kept in the models, Softail, FXR as well as in the Dyna models. By the year 2000 only limited models were seen using Evolution engines.