20B N/A with RX8 rotors??

charlies7 · 11-20-2008, 10:08 PM

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.

RETed · 11-21-2008, 04:59 AM

Quote:

Originally Posted by RotaryProphet

Is that a 20b with renesis housings? I never gave that any thought.

What a waste of time.

-Ted

***Herblenny*** · 11-21-2008, 07:14 AM

Quote:

Originally Posted by charlies7

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.

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

Quote:

Originally Posted by RETed

What a waste of time.
-Ted

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..

***Herblenny*** · 11-21-2008, 07:15 AM

Quote:

Originally Posted by RotaryProphet

http://www.rotaryshack.com/ignitions.html

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

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

charlies7 · 11-21-2008, 10:43 AM

Quote:

Originally Posted by Herblenny

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

warwickben · 11-21-2008, 04:22 PM

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

***Herblenny*** · 11-21-2008, 06:28 PM

Quote:

Originally Posted by warwickben

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

dregg100 · 11-23-2008, 05:01 PM

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

classicauto · 11-24-2008, 09:27 AM

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.

***Herblenny*** · 11-24-2008, 09:48 AM

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..

warwickben · 11-24-2008, 01:35 PM

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.

***Herblenny*** · 11-24-2008, 01:57 PM

Quote:

Originally Posted by warwickben

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

warwickben · 11-24-2008, 05:38 PM

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.

Christopher W. · 11-24-2008, 06:06 PM

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.

***Herblenny*** · 11-24-2008, 06:15 PM

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

11-21-2008, 04:22 PM	#21
warwickben sa rat rod Join Date: Mar 2008 Location: tewksbury ma iTrader: (4) Posts: 408 Rep Power: 17	would you have to make your own intake mani or does some one make a 20b mani for a carb? __________________

11-23-2008, 05:01 PM	#23
dregg100 Rotary Fanatic Join Date: Feb 2008 iTrader: (2) Posts: 432 Rep Power: 17	i guess i missed it, but whats it going in? the duece? __________________ '93 SSM Touring-S475... '87 Tii-LS1/T56

11-24-2008, 09:48 AM	#25
*Herblenny* Founder/Administrator/Internet Pitbull :) Join Date: Jan 2008 iTrader: (11) Posts: 644 Rep Power: 10	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.. __________________ DGRR 2013 - Year of 13B www.DealsGapRotaryRally.com http://www.facebook.com/Herblenny

11-24-2008, 01:35 PM	#26
warwickben sa rat rod Join Date: Mar 2008 Location: tewksbury ma iTrader: (4) Posts: 408 Rep Power: 17	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. __________________

11-24-2008, 05:38 PM	#28
warwickben sa rat rod Join Date: Mar 2008 Location: tewksbury ma iTrader: (4) Posts: 408 Rep Power: 17	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. __________________ Last edited by warwickben; 11-24-2008 at 05:41 PM..

11-20-2008, 10:08 PM	#16
charlies7 one broke moderator Join Date: Feb 2008 Location: Chicago iTrader: (2) Posts: 319 Rep Power: 17	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.

11-24-2008, 09:27 AM	#24
classicauto crash auto?fix auto Join Date: Feb 2008 iTrader: (0) Posts: 816 Rep Power: 17	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.

11-24-2008, 06:06 PM	#29
Christopher W. Rotary Fan in Training Join Date: Mar 2008 iTrader: (0) Posts: 98 Rep Power: 17	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.

11-24-2008, 06:15 PM	#30
*Herblenny* Founder/Administrator/Internet Pitbull :) Join Date: Jan 2008 iTrader: (11) Posts: 644 Rep Power: 10	warwickben, So you're saying leading and trailing fires at the same time?? Hmm.. __________________ DGRR 2013 - Year of 13B www.DealsGapRotaryRally.com http://www.facebook.com/Herblenny