Utilizing the rotary's design, Mazda opted to stack multiple 13B housings, giving birth to the idea for both the 3-rotor (13G, 20B) and four-rotor (26B) engines. The impressive thing is that this mostly allowed Mazda to use the existing parts without significant redesigns but with far greater output with significantly reduced stress thanks to the extra displacement.. Welcome to Derwin Performance. Bienvenue Chez Derwin Performance. We are THE rotary engine specialists! In this site you will find a wealth of knowledge about rotary engines from our 40 years of experience with the Wankel concept. We are located in Terrebonne, Quebec, Canada, but have served clients all over North America.

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Home / Rotary Engine Parts / E-Shafts / 13B 3 Rotor Factory Race E-Shaft. Sale! 13B 3 Rotor Factory Race E-Shaft $ 6,499.99 Original price was: $6,499.99. $ 5,890.95 Current price is: $5,890.95. Please contact for details. 13B 3 Rotor Factory Race E-Shaft quantity. Add to cart. Category: E-Shafts. Description. Deesan 20B 3Rotor Build. Deesan came to us looking for one thing - power. This was obvious as he chose to start with a 20B 3Rotor - but stock was not going to be good enough. After the initial tear down, we performed a number of modifications including; bridge porting the housings, side and face clearancing along with balancing the rotors.