أسطوانة (محرك): الفرق بين النسختين

* [https://web.archive.org/web/20140420124419/http://motocrossactionmag.com/Main/News/THE-LONG-HISTORY-OF-REVERSECYLINDER-ENGINE-DESIGNS-7056.aspx The Long History of Reverse-Cylinder Engine Designs] - motocrossactionmag.com