NRS FD Ceramic Seals for the RX8
 

Yes it can be done; and so far it works great for my car!!!!

Sven is SUPER SUPER helpful and got me all set-up; Speedsource milled my rotors for less than $300 - so $1300 total and you too can have a motor that is stronger; I have never seen an RX8 pull 21" of vacuum at cruise (NOT DECEL) until now....

Dyno results soon.

http://carphotos.cardomain.com/ride_...0012_large.jpg
http://i229.photobucket.com/albums/e...1042009024.jpg

nice, man

Kane, what kind of power are you shooting for?

I'd be stoked to hit 400WHP no meth on pump gas @15 PSI or so

But in reality I'd probably be at 360-370 until I up the boost and I'll need to add meth or water injection for that.

I'm not sure about this but can you use FD rotors and turn up the boost?

My understanding is it's the plates that are weak point in the renni. They can't handle too much heat or too high combustion pressures.

Did you use 2mm or 3mm seals?

thewird

2mm.

Not that their is anything at all wrong with that decision but if you were looking for stronger and had to mill the rotors anyway, why didn't you go with 3mm?

thewird

The Mazda cast is not deep enough. I mean it will work but it doesn't leave much material. I would be concerned about extreme high load situations with 3mm seals.

Could you please elaborate? How is it different from doing 3mm on an FD rotor? Which would be the part that is too thin?

thewird

It's the width.

I talked to Kevin (Rotary Resurrection) and Speedsource about it.... turns out when they widen the groove; it has a tendency to break off the shoulder of the rotor. But you don't know that until AFTER the motor is re-assembled.

If memory serves, Kevin said he loses 1 out of 4 8 rotors milled out... that is too high of odds for me.

Do you know what the failure rate is for milling them deeper for use in earlier 13B engines? I'm assuming that's the milling that you did have performed, correct?

Is what your referring to a machining error? As it needs to be a very accurate/precise machining process? So it being the machinists fault and not the rotor itself?

When machining an FD rotor to 3mm, there have been many cases where machinists don't get it spot on and trash the rotors. But this has to do with the machinist you go to. Once you find the right machinist, trashing rotors is no longer a problem.

Just trying to figure out why. Thanks.

thewird

I did have it performed by Speedsource. I do not know that the failure rating is - but I know it's pretty low.

Kevin can better answer that question - obviously 99.999% of the time is machining or material defects.... nothing technically should prevent you from running a 3mm seal in a RX8 - I just was unwilling to take the risk since 8 rotors are pretty expensive.

Thanks, that's what I wanted to know. My builder knows a good machinist that always gets it bang on so I don't have to worry about the RX-8. Was worried there was something that specifically was different on the RX-8 rotor that prevented 3mm from happening.

thewird

RX8 rotor & cut away for 3mm full height seals
 

A customer of mine in Russia is looking at running 3mm full height ceramic seals in RX8 rotors. Below is a pic of an RX8 rotor cut away showing the meat available in the slot as well as a stock RX8 rotor for comparison. Please note the cut away slot is not standard RX8 depth because they were using apex seals that are in between OEM height (FD) and RX8 height at 3mm width. Their slot in the cut away is 8.80mm or 0.3464", the total meat available is 12.20mm or 0.4803". This leaves approx 0.1339" to the bottom of the casting. The full height slot should be 0.385" deep leaving 0.0953" of meat remaining, almost 100 thou. From the picture the slot would be deepened another 0.0386", less than 1mm.

Hopefully this info will help others to make a solid decision when considering 3mm full height seals in RX8 rotors.

Thanks Dmitry for this excellent info!

http://img.photobucket.com/albums/v4...RX8cutaway.jpg