Matching the springs to the seals also plays a factor in idle and high rpm performance when you are modifying and moving away from stock settings

 

the machining turned out perfect, all the tolorances are good, did the assemble and all went smooth

 

How do the corner seals fit?

 

how do you mean?

 

Will the renesis corner seal take the deeper FD seal? In my head it seems that you would need a deeper slot in the corner seal as well, meaning you'd need FD corner seals.

 

ah, you are correct!

I used atkins rx7 solid corner seals, I had to do some light sanding in the apex grove of the corner seal, for the side clearances but they have the same diameter so it fit fine.

at the time goopy's website was done and I didn't realized they too offered solid corner seals, had I know that I would have went with them, to match the apex seal.

the OEM rx7 corner seal actually used a rubber center insert, the rx8 uses a metal center insert.
many rx7 guys had this rubber part burn out over time, well with having side exhaust ports on the rx8 I figured they would burn out instantly so that is why I did the solid rx7 corner seals

car runs great, Idle is bang on, vacuum is only 15inhg but performance seems the same if not better, only has about 450 miles on it. it might have pulled better vacuum if I used tighter side seal clearances.

 

Interesting! thanks for the update!

 

Still running strong with machined rotors

 

How is your compression ? Mine is quite bad ATM (75psi) and I don't think it has ever been that flash .

 

I haven't checked, I only have a standard compression checker. that I hold the check vavle open

what do you mean, I don't think it has ever been that "flash"?

 

Flash ... meaning good . Someone told me that there are issues getting good compression after doing that mod but there was a fix for it .

BTW ... I have a way of using a stock compression tester to give you all the info you need ....

 

Thought I had responded to this previously.

Low compression following a rebuild means somebody didn't do it properly.

 

Apparently there is a "trick" to getting good compression with this mod ..... I don't know what it is ... but was told this from someone who should know .

 

OEM seals here, 25,000 miles or so, good compression numbers when I tested it while we had three different (TR, Rotary Diagnostics, and the Mazda tester) rotary engine compression testers here last year. I still have great vacuum and it runs well so I assume it is still healthy for the moment.

Seems risky to me unless the builder recommends it and has experience doing it. A trick?

 

There are likely numerous tricks/points of knowledge required for the whole assembly. My recommendations for engines is well documented

However I should clarify to mean 'after broken in'. Even the best built engine is likely a little weak on the first crank up ...

 

so 9krpmrx8, you gots the rx7 seals in your rx8 rotors too?

 

Nope OEM Mazda Renesis seals. The key is to just not detonate,

 

^This!

 

Which isn't that hard if you don't push boost past 10psi ..............

 

I agree, 10psi is my limit. I generally run around at less than that though. I have been driving the car daily for over a month now, I can't seem to get back into the daily


Speaking of that, do you run more than one boost profile on your EBC? I do, and my AFR's are pretty rock solid regardless of which one I run, low boost or "high" boost.

 

I do have the ability to do that but rarely bother . Throttle control works just as well

Been doing a few track days lately and always turn boost down to 10-11 for those . Have settled at 13-14 psi for street as the setup seems happy there . At 16 it was always on a knife edge .

 

but life begins at 15psi

 

Yeah I will experiment when the big turbo goes on. I (well Pineapple Racing) plan on rebuilding the engine at that point whether it is blown or not and I will use as many new parts (housings, eshaft, rotors) as I can, WPC coat a bunch of stuff, etc.

 

It used to be 10 ..lol . Why do you think i'm redoing my whole setup ?

 

for 20psi!