So, this may seem like a stupid question but I have searched and cannot find an answer. What are the rotor housings on the renesis made from? Aluminum? Or some other metal? Reason I ask is because I want to test something, but it requires swapping plugs when the engine is at operating temp. If the housing are aluminum I will not do it. But if they are steel or iron I will.

 

Yeah I think they're aluminum.. Google it though, I'm sure it's out there if you look up the right thing.