RXciting

I've searched the forum to find out what I need to change in order to use RX8 stationary gears in a 13BT build but unfortunatly the information I found was some what confusing.

I read that your supposed to use the "entire front assembly" from the 13B REW. Now what i did not understand is if what was meant by that was just the plate, thrust plate and needle bearing, just the thrust plate and needle bering or everything between the front counter weight and stationary gear?

Also while looking throught the FSM's I noticed that the FC and Renesis engine show the thrust plate between the needle bearing and stationary gear, while in the 13B REW the needle bearing is between the thrust plate (front) and stationary gear and the thrust plate is right up against the plate of the stationary gear.

I'm not sure if that's a mistake in the FSM or if that's in fact how it goes? Now could i not just use the bearings/thrust plate from the Renesis

Also read that you cannot use the Renesis rotor bearings on a 13BT Rotors as the oil jets in the E-shaft do not line up with the oil groove in the bearing??

So one would need the Renesis Manual Transmission E-shaft in order to use the Renesis Rotor bearings?

Any insight or information from anyone who has succesfully used either Renesis Stat gears or Renesis rotor bearings in a 13BT build would be very much appreciated.

Thanks,

Frank.

PDF's of FSM for FC FD and RX8 can be found here:

http://www.mazdamotorsports.com/weba...servlet/PubRX7

drago86

I'm going to be using the FC thrust bearings/plate with the rx8 gears. Ive heard this works.

The renn rotor bearings im pretty sure are identical to REW bearings so there shouldnt be much of a problem.

Maybe what your thinking about is renn rear stat gear bearing which is 2mm off on the oil hole, this can be fixed with a dremal in a few seconds however.

drago86

If you did want to use the REW front stack you would need two REW thrust bearings, a REW front counterweight/thrust washer and the rx8 gear+thrust washer. I think the thrust plate should be the same but you should prolly replace it with a REW one anhow cus the wear marks your old FC one are going to be uneven for the new larger bearings.

If you have an S4 your going to have to balance the assembly. S5 should be fine with the REW front weight but a balance is allways a good idea.


Lastly, the 94 parts microfiche is just plain wrong, check the 95 one it shows the stack in the right order.

drago86

One last thing ive heard of main bearing clearence problems when using either the Rx8 e-shaft and older main bearings or Rx8 stat gears and older E-shafts so you might want to check this/adjust the bearings, or consider running an Rx8 Shaft too. It's and upgrade, being half a pound lighter then the FC/rew shaft.

RXciting

Thanks for the info drago86.

Is there anyone however that has already done this succesfully, and knows exactly what would and would not work.

Anymore info would be great.

Thanks.

GtoRx7

iTrader: (5)

Mazdatrix has done it, I know that is not personal experience coming from me, but it ths best I know of so far. Also the RX-8 rear gear has no provision for a O-ring, the Rx-8 engine has the o-ring machined into the rear plate. So you must use Hylomer or RTV around the flange of the Rx-8 gear, when installing into a older engine. I measured w/ digital calipers, a Rx-8 e-shaft, and all the oil holes are placed in the exact same spot as the old e-shaft.

rxtasy3

iTrader: (2)

just how old. gsl-se 13b or 70's rx4/repu/cosmo 13b?

GtoRx7

iTrader: (5)

a 87-88 turbo II shaft, and 93-95 shaft.

RXciting

Thanks for the info GTORx7, that was very usefull!

OK here's another question. Does anyone know the weights for a S4 or S5 89-91 not 92 counter weight weighs??

drago86

http://www.mazdatrix.com/faq/Rcounterweights.htm

RXciting

Thanks.

I forgot to mention that's for front counter weights i needed either weights or identifying featers.

Node

iTrader: (1)

you have to use some RTV as theres some oil ring groove missing. But they will work
My builder has told me this, and its also mentioned on mazdatrix's website I believe.

GUITARJUNKIE28

you have to oval out the oil inlet on the rear gear to get it to line up with the passage. if you don't do that, you'll have a bad day.

RXciting

Alright, thanks. Since I don't have my irons back yet, which way would I have to port it? Towards the back of the engine, or towards the front?

Also this would require no modification to the bearing itself right?