This may sound stupid but I could not find anything on the search function. The reason for the question is I have one damaged rotor housing and need to get another one.
Does anyone know if there where different versions of the series 5 rotor housings? What I mean is differences in bracings around the inlet and exhaust ports, spark plugs in slightly different positions, ports slightly different.
If this is the case, would it make much of a difference if one housing is slightly different to the other?

 

Only difference is in N/A and TII; that's the exhaust "sleeves". As long as you get a housing w/ a diffuser in it, you'll be fine.

 

Liquid, what do you mean by diffuser?

 

There is a diffuser in the exhaust port in the housing to cause turbulence to make the N/A's exhaust note less high pitched. Mazda makes an expansion of about 300% in the exhaust port to cause turbulence to help with the noise and with heat I believe.
The N/A has a larger diffuser which people like to swap out in favor of the Turbo exhaust diffusers for better exhaust flow.
I'll try and find some pictures.

 

If I have a turbo then it does not matter?

 

https://www.rx7club.com/forum/showth...haust+diffuser


Turbo housings=good

 

SO Node, Series 5 turbo housings are different?

 

No, TURBO housings are different. (S4, S5, & FD are Identical)

I have TII exhaust sleeves (w/o the diffusers) in S5 N/A Rotor Housings.

Oh, and I remembered... there IS a difference in N/A and TII housings. TII housings have a hole that must be plugged (coolant passage for the turbo or something like that)

 

Hmmm, not sure. There were a few updates between Series 4 and 5 on the engine that made Series 5 a lot better. But I don't know of anything that was changed on the housings themselves.
Better wait for someone with more knowledge about this to answer.

 

Don't they also have some sorta air something or whatever hole in the exhaust port? Or is that the coolant hole you're talking about.

 

Yeah, it does. N/A's have it too. It's under the exhaust sleeve.

 

The reason for question is my motor is in bits at the shop and there not open for another week. I can get another series 5 turbo housing but am worried it may be different to my series 5 turbo housing? They only have a couple left.

 

All S5 Turbo housings are the same.

 

Thanks guys.

 

Good luck