The 'seals' section in this article suggests that wankels need separate apex and side seals: http://what-when-how.com/automobile/wankel-engines-automobile/ htt

The 'seals' section in this article suggests that wankels need separate apex and side seals: http://what-when-how.com/automobile/wankel-engines-automobile/ http://what-when-how.com/automobile/wankel-engines-automobil... See also Pengaru's comment about problems with side seals, specifically: https://news.ycombinator.com/item?id=25451923 https://news.ycombinator.com/item?id=25451923