"For the purpose of displacement equivalency, either the rotary engine total displacement needs to be doubled or the piston engine total displacement needs to be halved. (...) we say that a 1.3 liter rotary has equivalent displacement of 2.6 liters." Source: "Rotary vs. Piston Engine Equivalency". Archived from the original on 24 December 2010. Retrieved 16 December 2010.
"For the purpose of displacement equivalency, either the rotary engine total displacement needs to be doubled or the piston engine total displacement needs to be halved. (...) we say that a 1.3 liter rotary has equivalent displacement of 2.6 liters." Source: "Rotary vs. Piston Engine Equivalency". Archived from the original on 24 December 2010. Retrieved 16 December 2010.