I dont think its worth the trouble going with RX8 rotors. The performance gain over the 9.7 out of the S5 NA motors wont be noticeable IMO.

What a waste of time.


-Ted

I'm starting to think that now.. I was only considering 8 rotors as I have a spare renesis at home.. I guess I need to see of I could get hold of some S5 NA rotors cheap:)

I kind of have to agree with you... But I think they are using aftermarket 3 rotor shaft and renesis stacks up nicely vs. going peripheral porting the housings. In some ways it makes sense... I guess you could go 4 rotor like this using Renesis engine..

Thanks for this link.. Damn, That thing isn't cheap!

I think Carlos Lopez also makes them. Not sure how much he charges though..

I saw a set on ebay for like 80 bucks..I almost jumped on it. But I figure I should buy a block first. LMAO:beatdeadhorse5:

would you have to make your own intake mani or does some one make a 20b mani for a carb?

Carlos Lopez makes one... as you could see from the previous picture I've posted...

I was told by my builder that he could build one also... I'm on full throttle for this so hopefully it will be built by DGRR :)

i guess i missed it, but whats it going in? the duece?

IIMO as stated its a bit of a waste of time.

The main problem is that even with a higher static compression, you still ahve to seal the rotor in the housing to make that compression. So all the machining, and the side seal differences of the RX-8 rotors will result in a loss of dynamic compression when compared to a S5 rotor designed to operate in this style engine.

And the dynamic compression the rotors make when they're running is ultimately what makes the power.

I understand classicauto! I've decided not to use the RX8 rotors.. I'm going to find some S5 rotors and start the build 'real' soon..

Better post pics and info as you go. Wounder if u can use jeff20b dildls trick with that dizzy. If I don't know what iam talking about on 1st gens u use 3 coils and 3 ignitors. On a 20b you would use 4 coils and 4 ignitors.

Can you post some more info on that?? As I'm kind of clueless :)

check my thread out for info
http://rotarycarclub.com/showthread.php?t=3618
basically trailing is stock 1 coil to control it threw the dizzy.
then each leading plug has its own coil. the spark plug wire goes from the coil right to the plug.

on my na 12a 1980 sa, i cant stall the car out now. what i mean is if i drop the clutch in first at a dead stop the car will buck once and pull forward. my car idles slightly under 1000 rpm. you get a much stronger spark on the leading plugs since each has its own coil.they only problem i can see with this setup is cause the leading now is a wasted spark setup. ie both plugs fire at the same time.i dont know enough about 20b's to know if that would cause a problem with the 3 rotor setup. if jeff20b shows up he can explain it alot better.


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Gmonsen, from the other forum, is using the RX8 rotors in his 20B N/A. They thought he was having a problem with the rotors and side seals but it turned out it was something else. Logan at Defined Autoworks is building my 20B N/A and he says that there is no real advantage....to much possible downside for to little upside.

warwickben, So you're saying leading and trailing fires at the same time?? Hmm..