Weber side-draft carburetor on 2009 - 2011 Renesis ?
01-12-2013, 10:34 AM
#1
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Weber side-draft carburetor on 2009 - 2011 Renesis ?
I have a wrap-over intake with a Weber 48 DCOE side-draft carburetor, on a 6-port 1986-92 13B. I'm looking for a way to attach the intake to a 2009 - 2011 6-port Renesis.
1) Does anybody make an adapter that will mate a 1986-1992 6-port 13B intake manifold to a 2010 6-port Renesis intake manifold?
2) Can anybody point me to a scale drawing of the 2009 - 2011 intake manifold ports. I'm trying to determine how far off the 6-port 13B intake ports are vs. the Renesis intake ports. If they aren't too far off maybe I a can fabricate and adpater.
3) Does anybody make a wrapover intake manifold for a 2010 6-port Renesis for a Weber side draft carb? If not, is there a combination of components that will get me a configuration whereby I can use my side-draft Weber 48 DCOE on a 2009-2011 Renesis?
Racing Beat has intake options for utilizing Weber and Holley down-draft carbs on Renesis engines but those options won't work for my application. Gotta be a side-draft carb sitting over the top of the Renesis; thus the need for an adaptor plate or a wrap-over intake.
1) Does anybody make an adapter that will mate a 1986-1992 6-port 13B intake manifold to a 2010 6-port Renesis intake manifold?
2) Can anybody point me to a scale drawing of the 2009 - 2011 intake manifold ports. I'm trying to determine how far off the 6-port 13B intake ports are vs. the Renesis intake ports. If they aren't too far off maybe I a can fabricate and adpater.
3) Does anybody make a wrapover intake manifold for a 2010 6-port Renesis for a Weber side draft carb? If not, is there a combination of components that will get me a configuration whereby I can use my side-draft Weber 48 DCOE on a 2009-2011 Renesis?
Racing Beat has intake options for utilizing Weber and Holley down-draft carbs on Renesis engines but those options won't work for my application. Gotta be a side-draft carb sitting over the top of the Renesis; thus the need for an adaptor plate or a wrap-over intake.
01-12-2013, 10:59 AM
#2
i know there are a couple JDM tuning shops running the Rx8 intakes on REW engines, so while the ports on the renesis are differently spaced than the previous engines, an adapter is possible.
its really too bad the upper intake is plastic, you basically need to fab that ending in a DCOE pattern instead of the throttle body.
a 48 DCOE is small, plus there is so much little fab work (fuel system is wrong, the ECU somehow needs to not know you switched to a carb, etc), i just don't see this being a great idea, but thats just IMO, and keep in mind that i have a very nice running weber fed P port.
its really too bad the upper intake is plastic, you basically need to fab that ending in a DCOE pattern instead of the throttle body.
a 48 DCOE is small, plus there is so much little fab work (fuel system is wrong, the ECU somehow needs to not know you switched to a carb, etc), i just don't see this being a great idea, but thats just IMO, and keep in mind that i have a very nice running weber fed P port.
Last edited by j9fd3s; 01-12-2013 at 11:29 AM.
01-12-2013, 12:25 PM
#4
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I have a racing application in a scenario where EFI may not be an option.
Which brings me to the next question... Given that I settle on a side-draft or down-draft carb solution, any thoughts on controlling spark/timing? This engine package is going in a tube-frame race car so the stock ECU won't be in the mix. Is an after-market engine mgt system like MegaSquirt my only option of is there a simpler, easier approach? I'm looking for simple, easy and cheap. Given the weight of the car, losing some hp in the final package won't make any difference to me.
Oops... I just realized... I should probably have posted this in the Series II Tech & Performance section huh? Shall I repost there?
Which brings me to the next question... Given that I settle on a side-draft or down-draft carb solution, any thoughts on controlling spark/timing? This engine package is going in a tube-frame race car so the stock ECU won't be in the mix. Is an after-market engine mgt system like MegaSquirt my only option of is there a simpler, easier approach? I'm looking for simple, easy and cheap. Given the weight of the car, losing some hp in the final package won't make any difference to me.
Oops... I just realized... I should probably have posted this in the Series II Tech & Performance section huh? Shall I repost there?
Last edited by mikeism; 01-12-2013 at 12:28 PM.
01-12-2013, 03:15 PM
#6
I moved the thread.
The Renesis has computer controlled oil injection that I don't know if the Megasquirt can handle. You may be better off with an earlier ported version of the 13B engine. The other option, since it is a race engine, is to block off the oil injection ports and run a strong oil pre-mix. If you do that, it doesn't matter which version of the Renesis you use.
The Renesis has computer controlled oil injection that I don't know if the Megasquirt can handle. You may be better off with an earlier ported version of the 13B engine. The other option, since it is a race engine, is to block off the oil injection ports and run a strong oil pre-mix. If you do that, it doesn't matter which version of the Renesis you use.
02-21-2013, 09:26 AM
#7
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This will help you to put a carb or throttle body on the renesis: RX8: Intake - Kits/Air Filters: RX-8 Engine Carburetor/Manifold Adapter Plate -
It supports any 1986- 6 port 13B intake manifold so the popular Weber IDA and DCOE's become possible on the Renesis series I and II.
On the Rx-7 forum, I was watching a thread saying that the Series I engine accepts an early 12a or 13b front cover. That solves the ignition issue because you can run an early 80's distributor and coils.
Now the same thread also says the Series II engine does not match the early front cover because of the different oil pump.
I am yet to confirm if it is possible to swap the oil pump for a Series I.
It supports any 1986- 6 port 13B intake manifold so the popular Weber IDA and DCOE's become possible on the Renesis series I and II.
On the Rx-7 forum, I was watching a thread saying that the Series I engine accepts an early 12a or 13b front cover. That solves the ignition issue because you can run an early 80's distributor and coils.
Now the same thread also says the Series II engine does not match the early front cover because of the different oil pump.
I am yet to confirm if it is possible to swap the oil pump for a Series I.
11-24-2022, 08:11 PM
#10
never saw this thread, which was probably a good thing 
the entire idea fails on anything but a full-on race application with a short ratio 6-spd transmission, because it eliminates the entire variable-length, valve-actuated intake system that defines the Renesis as a super-wide powerband engine. Even then it’s questionable, because it was done multiple times, yet never produced results better than the best stock intake & stock port Renesis I’ve ever seen.
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the entire idea fails on anything but a full-on race application with a short ratio 6-spd transmission, because it eliminates the entire variable-length, valve-actuated intake system that defines the Renesis as a super-wide powerband engine. Even then it’s questionable, because it was done multiple times, yet never produced results better than the best stock intake & stock port Renesis I’ve ever seen.
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Last edited by TeamRX8; 11-24-2022 at 08:14 PM.
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