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- Q3379246 subject Q8505549.
- Q3379246 abstract "The Evolution engine (popularly known as Evo) is an air-cooled, 45-degree, V-twin engine manufactured from 1984 by Harley-Davidson for the company's motorcycles. It was made in the 1,340 cc (82 cu in) displacement for Harley-Davidson Big V-twins bikes, replacing the Shovelhead engine until 2000 when the last EVO was placed in a production factory custom FXR4 (FXR2 and FXR3 were the first CVO's). In 1999, it was replaced by the Harley-Davidson Twin Cam 88 in the Touring and Dyna model and in 2000 in the Softail models. Also available in the Sportster model beginning in 1986, it was made in the 1,100 cc (67 cu in) displacement until 1988 and is still made in the 883 cc (53.9 cu in) and 1,200 cc (73 cu in) displacements for the Harley-Davidson Sportster, replacing the ironhead Sportster engine.Most analysts consider the Evolution to be the engine that saved the reorganized Harley-Davidson company from certain bankruptcy. Harley-Davidson's official name for the engine was likely related to the company's attempt to reform its image following the 1981 management buyout from previous owner American Machine and Foundry (AMF).Though a major design advance for Harley-Davidson in many ways, the Evolution is most distinct from earlier Harley-Davidson engine designs by virtue of its reliability, oil tightness, and ability to be run hard under all kinds of circumstances for tens of thousands of miles farther than any of its predecessors. Both the heads and cylinders of the Evolution engine are made from aluminum to reduce weight compared to a cast iron design. Air cooling efficiency is improved as aluminum is a superior thermal conductor to cast iron. The use of aluminum for both heads and block reduces wear on the head gasket seals, compared to a combined cast iron and aluminum design which could induce stress on the head gasket seals as a result of different rates of expansion and contraction between dissimilar metals. The blocky rocker boxes (thus becoming nicknamed "block head" which never caught on), aluminum heads and cylinders (also referred to as "jugs") are the only part of the Evolution engine that can be said to be essential; the Big Twin and Sportster incarnations of the Evolution are significantly different.".
- Q3379246 thumbnail Harley_V-twin_w_valvediagram.jpg?width=300.
- Q3379246 wikiPageExternalLink Evo.htm.
- Q3379246 wikiPageWikiLink Q1127794.
- Q3379246 wikiPageWikiLink Q13707.
- Q3379246 wikiPageWikiLink Q1501578.
- Q3379246 wikiPageWikiLink Q152074.
- Q3379246 wikiPageWikiLink Q1861637.
- Q3379246 wikiPageWikiLink Q192814.
- Q3379246 wikiPageWikiLink Q2056851.
- Q3379246 wikiPageWikiLink Q2546306.
- Q3379246 wikiPageWikiLink Q267714.
- Q3379246 wikiPageWikiLink Q2699306.
- Q3379246 wikiPageWikiLink Q308881.
- Q3379246 wikiPageWikiLink Q34493.
- Q3379246 wikiPageWikiLink Q3783381.
- Q3379246 wikiPageWikiLink Q4744378.
- Q3379246 wikiPageWikiLink Q49718.
- Q3379246 wikiPageWikiLink Q5658739.
- Q3379246 wikiPageWikiLink Q5658744.
- Q3379246 wikiPageWikiLink Q5658759.
- Q3379246 wikiPageWikiLink Q643626.
- Q3379246 wikiPageWikiLink Q8505549.
- Q3379246 comment "The Evolution engine (popularly known as Evo) is an air-cooled, 45-degree, V-twin engine manufactured from 1984 by Harley-Davidson for the company's motorcycles. It was made in the 1,340 cc (82 cu in) displacement for Harley-Davidson Big V-twins bikes, replacing the Shovelhead engine until 2000 when the last EVO was placed in a production factory custom FXR4 (FXR2 and FXR3 were the first CVO's).".
- Q3379246 label "Harley-Davidson Evolution engine".
- Q3379246 depiction Harley_V-twin_w_valvediagram.jpg.