renesis center iron

[Nutsid]

Yes, the ports are different. The four port automatic plate with have one opening for the intake and one for the exhaust (hence, four port). The manual, six port model will have two openings for the intake and one for the exhaust. The way the ports work in a rotary is you have the openings on both sides of the rotor that are timed to release the intake charge at the same time, and expel the exhaust from both the end plate and the center plate at the same time as well.

This is just my assumption based on what the inside of traditional 13B's and 12A's look like. I have never tore down a Renesis, but I couldn't imagine the concept being different for the intake, as the only concept changed to my knowledge has been moving the exhaust ports onto the irons as well.