Hey

I need insight https://www.nopistons.com/forums/pub...IR#>/smile.gif



Im having a hard time finding rotorhousings for my 12A turbo build-up.

Reason is: I need perfect ones with NO cromeflakeing what so ever, used housings all have that unless they are from an Rx-2(carbon seals right?)

I been told the Rx-2 housings wont last long with steel seals, now that sucks :-( https://www.nopistons.com/forums/pub...IR



My idea on which i need insight is:

I have plenty 13B rotorhousings in great shape, could i mill them down to 70mm and use them with a 12A motor?

I have the skills, CNC mill and template to do the waterseal grooves.



Sure new 12A housings are available everywhere cheap, but shipping and import taxes would ruin me(Denmark)

For reference, ONE rotorhousing is 760$ overhere :-(

I've heard of it done, but you'd need to use '86-02 side housings unless you could accurately replicate the coolant seal grooves. You would need to replicate the oil O-ring grooves no matter what. But I see you already know that. https://www.nopistons.com/forums/pub...IR



I am interested to see how it turns out if you decide to try.

Im really interested in it as well, as I was just thinking about it a few days ago...

Apex seal support over the exhaust port?

Yes it will https://www.nopistons.com/forums/pub...IR#>/wacko.gif



Removing 5mm on each side ofcourse, not 10 on one side.



Haha everybody thought about this, but I was the only one desperate enough to ask the question https://www.nopistons.com/forums/pub...#>/biggrin.gif



Guess Ill give it a try.

yeah we thought about it too, see no reason it wont work...

Earlier this year I was selling an engine with 12A turbo rotor housings. Too bad. They only had 10k miles on a rebuild done in '03. The new onwer is a new member of the RX-7 club forum.



You can't get 12A turbo rotor housings anymore unless you buy them from MAXT. https://www.nopistons.com/forums/pub...IR#>/smile.gif

ive heard of filling in the o-ring groves with epoxy on the iron sides and it working ok, never tried it though

^^^ Huh

There are at least three things wrong with that.



First, the oil passage O-rings are in the rotorhousing on all engines, so even '86-02 side housings need the groove cut into the rotor housing. Mazda probably did this to keep this critical area of the side housings as strong as possible.



Second, we're taking 13B rotor housings and cutting them down. Even if they started out with coolant grooves, they would be eliminated by the machining process. We're not dealing with a two-groove problem, but a no-groove problem.



Third, there is no third.