For top rpm operation enhanced clearance amongst the rotors plus the housing is essential to prevent contact as a consequence of warmth induced growth and rotational forces. For bridgeported and substantial boost turbo engines. See also two piece eccentric shaft below. To the Renesis engine, the exhaust ports are located https://fernandoptuuu.dailyblogzz.com/32424981/the-smart-trick-of-rx7-engine-that-nobody-is-discussing