Possible 4-Port N/A Start?

Redshft · 06-17-2010, 12:55 PM

It's my race car, not a street car (so streetability wasn't a consideration) but, figured I'd chime in. I'm running S5 4-port irons, full bridge port with RX8 rotors, e-shaft, stationary gears etc. and a Weber 51IDA.
Full disclosure, I've not gotten it properly tuned, as I can't seem to keep a transmission in the car (I changed it out 6 times in a year) but initial signs are promising. It does work, it seems to be promising power-wise so far.
With S5 rotors getting scarcer all the time, I think more people will start using RX8 rotors down the road, but, there are a few catches.

If you are going to port it, be aware that the side seals on an RX8 rotor are in a slightly different position than the RX7 rotor. So, in my case, my builder needed to tweak the bridge port template a bit as if he used his standard bridge template (which was Racing Beat I believe) the corner seal would hit the port. So, he needed to create his own.
The other thing is, the apex seals lands are not as deep on the RX8 since they have no peripheral exhaust ports and they don't need to be. We had my rotor lands EDM wire cut to accept Racing Beat RX7 apex seals and they fit perfectly.

Silver86 · 06-18-2010, 11:04 AM

i shoulve searched before making my thread... cause this is also exactly what i plan on doing...

06-17-2010, 12:55 PM	#1
Redshft Rotary Fan in Training Join Date: Feb 2010 Location: Halifax, Nova Scotia, Canada Posts: 78 Rep Power: 16	It's my race car, not a street car (so streetability wasn't a consideration) but, figured I'd chime in. I'm running S5 4-port irons, full bridge port with RX8 rotors, e-shaft, stationary gears etc. and a Weber 51IDA. Full disclosure, I've not gotten it properly tuned, as I can't seem to keep a transmission in the car (I changed it out 6 times in a year) but initial signs are promising. It does work, it seems to be promising power-wise so far. With S5 rotors getting scarcer all the time, I think more people will start using RX8 rotors down the road, but, there are a few catches. If you are going to port it, be aware that the side seals on an RX8 rotor are in a slightly different position than the RX7 rotor. So, in my case, my builder needed to tweak the bridge port template a bit as if he used his standard bridge template (which was Racing Beat I believe) the corner seal would hit the port. So, he needed to create his own. The other thing is, the apex seals lands are not as deep on the RX8 since they have no peripheral exhaust ports and they don't need to be. We had my rotor lands EDM wire cut to accept Racing Beat RX7 apex seals and they fit perfectly. __________________ 2004 RX8 GT 1986 RX7 Track Car: 13B Bridge Port w/ Renesis Internals and Weber Carb 2003 MazdaSpeed Protege 1988 RX7 Convertible - new project 2004 Impreza and 2003 Legacy wagons for hauling groceries and The Dog Last edited by Redshft; 06-17-2010 at 01:02 PM.

06-18-2010, 11:04 AM	#2
Silver86 now what? Join Date: Jul 2009 Location: SE Wisconsin Posts: 178 Rep Power: 17	i shoulve searched before making my thread... cause this is also exactly what i plan on doing... __________________ 1986 Rx7 coupe - arctic silver - sold aka - 20bforme