where can i get a set of rx8 rotors? they should fit in my 89 gtu with a rx8 ect. shaft correct?

 

You can buy the rotors from any Mazda dealer, or most of the vendors.

You will need to have them machined to use the older style apex seals from the previous 13B. The Renesis seals are not tall enough to handle the peripheral exhaust ports and the rotor grooves are not deep enough to handle the older seals.

There is virtually no advantage to this swap, as proven on the dyno.

 

I believe both the turbo and non turbo S5 rotors weigh in at 9.7 lbs.
The RX-8 rotors weigh in at 9.2 lbs. I would imagine the difference in weight would cut down on rotational mass thus resulting in an engine capable of operating at higher RPM's. Worth the cost??? I doubt it.

 

you'd be better off buying the rx-8 eccentric shaft as it is 1 pound lighter and will fit your engine !

 

Weaker casting also as proven from Mazdatrix there is nothing to be found power wise from use the RX-8 rotors this has been covered countless times. search

 

i think its a half pound lighter.

 

How would you be able to raise the compression ratio? How much are cursom race rotors?

 

"Will they Work"

Yes and no

1. The apex seals are not EXACTLY the same (length and width are the same height is not)

2. The rotors also use a dual side seal

3. The corner seals are also different to fit the shorter depth of the apex seal

This is all do to the configuration of the rx8 side ports.

So I am not sure 1. If you CAN have them machined to suite or 2. The longevity if you leave them stock (performing a job they were not designed for)

I watched as a buddy of mine SCCA racer (shop owner) built a customers engine (rotors), He stated that although he knows of guys who cheat with the rotors the performance advantage is “waste of time. (Mind you I don’t share his views on many topics)

I think that the lighter weight and compression boost must perform better (math doesn’t lie)

I was also told buy a non rotary friend of mine (after his trip to Puerto Rico) that the guys down there are boosting on the rx8 rotor and that they say that the compression ratio (w/out the turbo) is more like 11.0 in an non rx8 rotor housing (THIS IS UNCONFIRMED)

IMO: I think that they can be maid to work and the performance benefit will be note worthy but not huge.

Current non turbos are 9.7 and weight 9.54
Rx8’s are about 10.0 and 1-2lbs have been removed off the assembly

So outside of a turbo you can not make up the compression, however get a light weight flywheel 17lbs is very streetable.

 

I didn't say anything about power..
read

 

well why would you want to rev it higher if it won't make any more power by revving it higher?

 

arghx- To look mad cool with all the Honda guys yo!

 

or to hang with them 12,000 rpm redline crotch rockets.

 

You could also use S5 rotors and have them lightened? I think that might be another feasible option. Either way, machining will have to be done.

 

Wow, do mods that are not going to increase performance...
...have the hidden INSIDE the engine so no one can see or confirm...
...and just brag about it?

WHERE DO I SIGN UP FOR THIS???


-Ted

 

this is incorrect, they have 3 oil control rings which is different, but still only use one side seal.

 

I have carbon fiber rotors and kevlar apex seals, my compression ratio is 25:1

 

Let me rephrase for all of those tryyyying to hate,
"I never said anything about power"... meaning...
Lightening the rotors would not give you "additional horsepower".
Do you gain horsepower with a lighted flywheel, NO. Similiar concept.
Does it aid in increasing engine performance and efficiency at high rpms for extended periods, absolutely.

 

this got a little blow out of proprtion i was just interested in them and where to get them. and yes i understand they will give me marginal power gains at best. if i was out to make tons of power i would just do a turbo ii swap, it would be cheeper

 

Ha, I wouldn't be suprised if we see something like that in the next couple of years lol.

 

Mine is 26:1!! Beat that

 

Just get a pair of high rpm, high compression rotors. I think Racing Beat is selling them for $500 each ($1,000 for two). I'm sure Mazdatrix and others would have them too.

 

Too bad that's a pic of an FD...

Let me make it FC specific...



-Ted

 

Its coming along eh? Nice

 

You must consider moment of inertia, the .6 lbs worth of weight is closer to the center of rotation than weight on the rotors. If you lightened each rotor up by .3 lbs (to give the same amount of weight reduction as the shaft) you will see more "power increase" than you would with the same weight reduced off the e-shaft.

Not justifying the cost, just saying that in terms of power .6lbs e-shaft < .6 lbs rotors.