still an ongoing dilema this. my basic overview of spec:

bridge port
enlarged exhaust ports
2 piece e shaft
mazdatrix oversized stud kit
hardened stationary gears

i will be using 3mm apex seals, but which are best. i will be using the car for strip with a big turbo and circuit racing on a smaller turbo. i doubt the car will see street use.

which seals would i be best going for?

pts, als, atkins, hurley, tuff stuff etc

 

Why 3mm seals?

It sounds like you are shelling out the big bucks for your motor so step up for some ceramic 2mm 2 pieces and run them with new housings.

 

i got speaking to reputable engine builder over here in the uk and he just said that i would be best off with 3mm seals. would ceramics be better ?

 

3mm seals should really only be used when your apex seal grooves are worn out and can no longer support 2mm seals. Plus it is extremely hard to maintain the seal grooves parallel slots when milling them out to 3mm.

High quality 2mm ceramics should do you well, research up on them and you will be amazed how much boost some people are running on 2mm seals. Remember that mazda has made reductions in seal thickness for a reason.

 

yeah ive been looking at nrs grey seals after your previous post. they look like the way to go. i think i'll definately invest in set of those.

 

i'll only be using my car for racing. is it best to go with 1 piece or 2 piece seals ?

 

If you are only racing, go with 1 piece seals.

There is a good post about them here.
https://www.rx7club.com/showthread.p...ht=piece+seals

 

thanks for your help!

 

What are the advantages to two piece seals? is it simply longevity for daily driver?

 

All of Mazda's current seals are two piece. Two piece are self adjusting for length so that they don't need clearancing and maintain a good seal as the engine expands and contracts.

Mazda previously used a 3 piece seal but that failed in the sense that it allowed far less wear before the seal would roll out of the rotor apex.