While they look perfectly round, piston skirts are actually slightly oval. ...something which has been the case for at least 80 years: https://news.ycombinato

While they look perfectly round, piston skirts are actually slightly oval. ...something which has been the case for at least 80 years: https://news.ycombinator.com/item?id=15397926 https://news.ycombinator.com/item?id=15397926 (the article in that link has now moved to https://www.web.imperialclub.info/Repair/Lit/Master/003/index.htm https://www.web.imperialclub.info/Repair/Lit/Master/003/inde... )