1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Rotary Engineering Dual Weber 36DCD Carbs

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Old 09-11-09, 06:18 PM
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Stigulus Moderatorai

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Rotary Engineering Dual Weber 36DCD Carbs

My dual webers appeared in the post last week and I figured I'd show off what I've done to them since. A forum member is also sending me some pictures of the original installation manual so when I get that I'll toss it up online for future reference.

Out of the box:


Not too dirty:


Velocity stacks:



Cleaned:






Little 36DCD's:


Back together:






If anyone has any other information or whatnot, I'd love to hear it.

Last edited by Sgt Fox; 09-11-09 at 06:24 PM.
Old 09-11-09, 06:59 PM
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Stu-Tron Get Yo Groove On

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It was YOU who beat me to them! Jk Hope you enjoy them!
Old 09-11-09, 07:36 PM
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very nice setup. I'm running a side draft weber
Old 09-11-09, 07:44 PM
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When I bought my first set for the widebody, I did 2 things, rebuilt the carbs and powdercoated the intake and linkage. If you can get your hands on a wideband, it will make tuning sooo much easier. Fwiw, Holley air corrector jets will work for the main jets at the bottom outer side of the carb. Since RE ground off the jet #s I had no idea where to start and don't have a jet guage.

Don't recall for sure but I think I ended up in the mid to upper 70s, but don't quote me. I may still lean it out a bit since I keep fouling plugs during start up. Once you get it timed, I think you'll be very happy with it. Leep in mind that many of them were set up for thier street ported engine. When You get a chance, post the diameter of the venturis. The number is cat on the top part of the lip. The 12A and 13B had different venturi.

I'll be looking forward to seeing the manual as all I have is a couple exploded diagrams.
Old 09-11-09, 09:06 PM
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The Shadetree Project

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uummm pretty!
Old 09-11-09, 10:12 PM
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Mazda goes MMMMMMMM

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Lookin' good!
Old 09-11-09, 11:07 PM
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Originally Posted by trochoid
Leep in mind that many of them were set up for thier street ported engine.
I am hoping they are jetted for a stock port. I believe that they came off a stock port engine.
Old 09-11-09, 11:08 PM
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Here are some pictures of the RE Weber 36DCD Manual

Courtesy of forum member Serzy. Thanks a lot man. He sent these pictures to me a while ago but I lost the file until recently. Sorry it took me so long to post them.

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Old 09-11-09, 11:14 PM
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Can You Wankel?

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Sgt Fox, What did you use to clean the carbs? Did you just spray with carb cleaner or dip them in a carb cleaning can?

I currently have these on a stockport 12a but I'm having some ignition issues at the moment so i have yet to see how the really perform.
Old 09-11-09, 11:30 PM
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i bought a set of these a few years back off of eBay hoping to run them on my 13b 4 port but someone modified the manifold by cutting and welding on a plate to fit a six port i think ....so i never ran them and since sold the car so i am selling them .
had them listed on eBay but i listed it wrong so it didn't show up .

im gonna list them in a day or two again so if you want a set you should check them out

ill post a link when i do
Old 09-12-09, 10:29 AM
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Very nice work, I picked up a identical setup a few months ago, can't wait to try them out, just haven't had the time.
Old 09-12-09, 06:47 PM
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Mazda goes MMMMMMMM

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I'm a sucker for old manuals and I wish I had that when I had the setup!
Old 09-12-09, 11:28 PM
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Originally Posted by Mankdrake 2661
I'm a sucker for old manuals and I wish I had that when I had the setup!

What can a stock 12A dyno with that carb setup?
Old 09-13-09, 07:15 PM
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Mazda goes MMMMMMMM

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Never had mine dyno'd....
The original RE advertisement said with a header it was 150hp....I'm assuming at the flywheel. Also it didn't specify if it was a stock port or not.
Old 09-14-09, 07:14 PM
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Got some more info:


RE's Dual Weber Installation Guide



Haynes Weber 28/36 DCD Book
Old 09-14-09, 09:10 PM
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I just swapped a motor with the same setup into my '85 and I appreciate the info. I will need to retune the setup on mine and the manuals will help a lot. The vacuum advance on the distributor wasn't hooked up on the other car and I didn't see anything in the manuals about it. Is it just ignored or is there someplace to hook the vacuum line to?
Old 09-15-09, 07:58 AM
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Waffles - hmmm good

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Heres the original catalogue entry for it:

Attached Thumbnails Rotary Engineering Dual Weber 36DCD Carbs-dualdcds.jpg  
Old 09-15-09, 10:36 AM
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Be sure to set the floats correctly. When I had DCDs they liked to flood when I parked nose down on steep hills.
Old 05-16-10, 07:01 PM
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just found same duel weber carbs and intake at yard sale this weekend... got it for $100!! cant wait to put it on my rx3
Old 10-23-12, 01:14 PM
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I know this is a super old thread but anyone have any leads on any of these things floating around?
I was going to give up on my fb project until i heard about them...
Old 10-23-12, 05:48 PM
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There's one on ebay for $1000 that's been up for few months.
Old 10-23-12, 08:23 PM
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79 w 13B4port

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Waaaay overpriced......... Even if it is a kickass setup.
Old 10-26-12, 02:26 AM
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I was walking through a junkyard about four years back and saw a set of those lying in the mud. I couldn't believe it, I almost grabbed them.
Old 10-26-12, 02:29 AM
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Originally Posted by t_g_farrell
Heres the original catalogue entry for it:

They changed that article because of me. I called up RE and talked to Joe. They had the duals making 152 HP and the single making 154 hp. After I brought that to his attention they changed it. They were selling more of the singles because everyone wanted more hp. They had the numbers backwards.
Old 10-26-12, 01:11 PM
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Mazda goes MMMMMMMM

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Couple of pics from when I had these carbs.

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Loved the look and they performed well too.


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