DocHoliday89

iTrader: (10)

Has anyone cut peripheral exhaust ports into a Renesis rotor housing to be use in a REW? If not, why?

lastphaseofthis

iTrader: (8)

its on my todo list. also there is this thread Full Bridge, Semi PP Intake And Exhaust Engine Set UP.. - Page 2 - RX8Club.com

I emailed him asking for an update but he said he hasnt had time to do anything with it.. that was 3 months ago

the things to note are the oil injector port locations, and that there are 2 per housing, i plan to start with new 09 housings, with the 3 oil per housing

also the water seals changed. i supposed you could just double them up. i plan on using rx8 irons.

DocHoliday89

iTrader: (10)

Thanks for the link. I've been window shopping REW housings and MSP housings are so much cheaper. Granted the work to PP the exhaust will certainly raise the price, I'm still surprised I haven't seen it done yet. There's a guy on Ebay asking $2100 for a brand new set of REW housings. It's mad. Cheaper to order them from Japan at that rate. And how hard could it be? the marks are there. drill a hole, weld in a pipe, clean it up. haha. And I did forget about the oil injectors, but even there you could plug and premix if you didn't want to engineer a solution. I wish we could just convince Mazda to restart production on the old housings.

When do you plan on starting? I'd be interested in following that thread.

lastphaseofthis

iTrader: (8)

i made pport housings before, i weld alum pipe to the inside water jacket and the outside housing, it seals with no puddy. too hard to explain... and the pix are scattered,but you drill 1 and 3/4 all the way thru, but you also drill 2 inch wide just into the aluminum until you get just into the inside water seal support wall.. just before the steel liner. then slide in 2 inch OD pip with 1.3/4 ID to match hole in the steel liner. welder up

found pix..

DocHoliday89

iTrader: (10)

Looks good. you run that yet?

lastphaseofthis

iTrader: (8)

naw, like 6 housings made, never got around to going deaf from them. turbos got me and my n/a joy died.

DocHoliday89

iTrader: (10)

How do you get reliable, repeatable results, as far has port placement? Have you had any problem with matching the port timing between two housings?

lastphaseofthis

iTrader: (8)

I Made a welded jig that bolted into the factory tension bolt holes and bolted to the drill press. there wasnt anyslop in my jig, if i wanted to move the hole i could rotate the plate, and obverse the degrees indicted, i used -5 with my jig to make the ones i made so far, i could make more and change things but i could easily repeat what ive done also.

RotaryEvolution

iTrader: (30)

the exhaust needs cooling, you can't just cut a hole and press in a pipe... yes the housings are cheaper and more plentiful but you have an FD and you want to go cheap on the rebuild? expect issues.

and yes, Goopy sells peripheral port MPS rotor housings. but they probably abandoned it because the RX8 guys just slap a turbo on their MSP and cook the side seals because, it's easier.

ironically i built an RX8 with FD rotor housings, opposite of what you are trying to accomplish.

John Huijben

iTrader: (1)

There is also the issue of the rotor housing seals, they are in the rotor housing on an 8, so you'll need to fill one of the grooves somehow. Also modifying the rotor housings for a PP is never ideal. I also did a couple by welding, and it does work, but next time I will machine a thread in there and use a threaded bushing (Like xtreme rotaries does).

Anyway if you want to go cheap, probably easier to use S5 or S4 stuff.

RotaryEvolution

iTrader: (30)

the whole idea is still rather rediculous, it's like tripping over a dollar to pick up a dime.

the machining labor and potential failures far outweigh the benefits in using RX8 housings.

rx7 housings are still available new, they are still available used as well, they are still available used for decent prices if you are patient!