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!

 

I personally wouldn't run a full height 3mm seal in those rotors. I'd have no issues running a full height 2mm seal though but that's just me.

 

Not to mention if it was going to be an N/A application, you'd probably be better off with the sealing of a 2mm seal, no?

 

I honestly can't see a real need to ever run a 3mm seal unless you are over 500 hp. A 2 piece 2mm seal is pretty darned strong. Much stronger than 3 piece 2mm seals and mcuh stronger than Renesis apex seals. A 3mm seal will wear more on a housing. It's mostly a function of seal weight. 3mm seals are an upgrade that is really over rated.

 

and for over 500hp you're talking turbocharged, but what would be the point in running renesis rotors in a turbo motor. So, 2mm seems like it would be the best option, and it leaves you more meat!

 

welcome to several years ago ...

 

I'm curious. Glassman, does NRS make ceramics for stock Renesis engine applications or do you only sell older type seals?

 

What's the point of this post? If you have nothing to contribute, then don't say anything. As a moderator, here is my point: you come off looking like an arrogant *****, and we have no way of knowing if that's the case or not.

 

I've made them before and we are tooled up to do the short height. Usually they are special order though. I am making 3 sets in this next run, 1 is sold, 1 for my buddies 8 and 1 extra set.

 

Yea I know but my customer in Russia had a hard time finding answers so he did it himself that's all. I posted because I'm sure others have had a hard time getting answers and determining the best options for their application. Lots of others have gone 3mm in these rotor so yes it's nothing new.

 

Well, even though the application does not directly affect me. It was good info to know and I appreciated the post.