Are front and rear housings exactly the same ? if they are different how do u distinguish them from each other ? will they runbackwards ?

 

please rewite the question. be specific.

 

Theyre not the same.

If I remember correctly it has something to do with the EGR passage cast into the housing, and if you run them the wrong way they wont line up. Not a big deal if youre not dealing with emissions.

 

The EGR on the S4 is on the center Iron, and on the S5 it's bolted to the upper intake manifold.

Yes they are nearly identical. The only different that i know of is the rear housing on T2s has a passage for the coolant.

 

mazda part numbers are diff but there are pretty much identical

 

No, they are not the same. The difference is in the passages for the air that goes from the airpump .....to the air control valve .......then to the exaust ports. The passages that lead to the exaust diffusers in the rotor housings are NOT the same. If you swap the rotor housings....the airpump air will NOT go to the exaust ports i.e. the diffusers in the exaust port in the housings.

I'm not talking a thing about EGR valves and egr passages. I'm talking air from the airpump that goes thru the acv to the EXAUST ports on the rotor housings.

If you don't EVER have to pass emissions and don't care whether the next owner of your car has to pass or not, then swap the housings. The performance will not be any different than if you put them in their correct place.....if you discount emissions performance. And it's immoral to sell someone a car/engine in this condition and not tell them it's buggered up.

 

https://www.rx7club.com/showthread.p...rotor+housings

 

Ah, thanks Hailers for clearing that up. I knew there was something that was the different...

 

Hailers you seem to be the only one that knows this. You are the F/R rotor Champion. Keep up the good work. Thanks for the help.

I think I asked this question but did not get the response that this thread recieved.....I hope mine are on correctly. I'll find out in 18 months when I go for a smog!!!

 

Each housing has a stamped letter on it just left of centerline. F for ......... and R for ......... Fill in the blanks (humor). It might be possible to see the stamped letter on the front housing without taking much off the top of the engine. Usually the stamped F or R is not really that well defined, but it WILL be there on the left of centerline of the rotor housing.