I am going to build a custom 6 port engine with some upgrades. While looking around and planning stuff I found the rotormaster ceramic apex seals. I cannot find anything more than some site saying they offer them.
Apparently they are 800 bucks for a full set of 6 seals, a bargain considering NRS seals cost almost 2k and Ianetti seals cost around 3k if they can be found.
Nothing can be found considering these seals and I am anxious to buy them. I'd buy them considering the benefits of ceramic outweigh the price for me.
Does anyone have any experience or thoughts on these seals?

 

Is it an NA or FI build?

 

N/A for sure! I also wanna go over the normal 9k rpm limit so the ceramics will help in that regard too.

 

I don’t know anything about those seals, but am under the impression they’re not the same type as Iannetti because they’re literature says they’re intended for high boost applications. That likely means they need heavy pre-mix. Iannetti has several different type now. There’s the original type that’s great for NA, there’s the Gold ceramic that are super high $$$, and now they have a metal type that are very low cost, but intended for FI with 2.5 oz/gal premix recommended.

Mazda Motorsports sells the original type for about $900/rotor (I think). You don’t have to be a racing member to buy aftermarket parts there. These are highly recommended for NA, but on the Renesis the best long term results are going to be having the rotor apex slots EDM cut and use the taller RX7 apex seals with appropriate corner seals.

the issue of 9k+ rpm is the side seals. Unless you come up with some kind of miraculous way to make peak power that high on a Renesis, which I’ve yet to see but am always open to new ideas with sound reasoning, then you don’t want to be revving that high unless it’s for some specific competition reason and you’re willing to live with the cost of a shorter engine rebuild life.

What the apex seals do (Iannetti any way) is minimize rotor housing surface wear. The Renesis shallower seals are prone to warping in the middle though from high exhaust temps. Hence the RX7 deeper seal recommendation. The apex slots also tend to wallow out a lot faster due to the shorter depth. With Iannetti RX7 seals both the rotors and rotor housings should last through multiple rebuilds if properly maintained without some kind of catastrophic failure.


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theese rotor master seals are quite new to market,
and as far as I know,
don't know anyone who has been using them, id be cautious

 

Iannetti is also limited distribution I think rather than hard to get. Mazmart near Atlanta, Ga sells them. You could try to talk to Paul or someone there too. Pretty sure they keep some in stock.