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Durango_Boy Anyone got experience with side draft carbs?
Elite Guru
Columbia, MO
2583 Posts
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I'm looking into the possibility that I will be using a pair of Mikuni carbs for a dual side draft application on my soon to be finished roller 405.

I'd love to see some pics from people that have them or have seen them.

Unique look and I'm rather excited about the idea.
Posted on: 2009/1/30 22:51
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brut Re: Anyone got experience with side draft carbs?
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New Albany, IN
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I love seeing things "out of the ordinary"....you have any sketches?
Posted on: 2009/1/31 0:19
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Durango_Boy Re: Anyone got experience with side draft carbs?
Elite Guru
Columbia, MO
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Quote:

brut wrote:
I love seeing things "out of the ordinary"....you have any sketches?



Here is the setup I have, and then how a dual side draft setup looks on a 350.

I plan on a more modern adapter that brings the carbs in closer to each other and flows better but that is basically how they look.


[IMG]http://i106.photobucket.com/albums/m242/durango_boy/Mikuni001.jpg[/IMG]

[IMG]http://i106.photobucket.com/albums/m242/durango_boy/tufffxdonk.jpg[/IMG]
Posted on: 2009/1/31 4:25
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brut Re: Anyone got experience with side draft carbs?
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New Albany, IN
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Is that sitting in a street rod?

I think it would look really bad-azz if you could get two of them on a dual-quad manifold!
Posted on: 2009/1/31 4:47
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cuisinartvette Re: Anyone got experience with side draft carbs?
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1782 Posts
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Google Kinsler injection.

Cool stuff
Posted on: 2009/1/31 4:50
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BrianCunningham Re: Anyone got experience with side draft carbs?
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Posted on: 2009/1/31 13:48
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Durango_Boy Re: Anyone got experience with side draft carbs?
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Columbia, MO
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The problem is dealing with just TWO carbs is plenty expensive...doubling that not only doubles the cost but it takes a lot more tuning and takes away driveablity. I'm calculating I'll have around 800 usable CFM with these two carbs. Four of them would be way too much for my roller 405.
Posted on: 2009/1/31 14:14
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Schrade Re: Anyone got experience with side draft carbs?
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eastern NC / e-i-e-i-o
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Can the intak-ing be routed forward, away from the headers?
Posted on: 2009/2/1 4:13
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bogus Re: Anyone got experience with side draft carbs?
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San Pedro, CA
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side drafts on a V8 raise all sorts of air intake plumbing issues... I don't see how they are going to be relocated.

The only side drafts I have ever worked with are SU's... they do perform well.

You see, the upside to side drafts are their direct aim into the combustion chamber. But that is best for inline engines... the engine that had the SU's was a Jaguar XK-6.

IIRC, the Mikuni's are pretty much clones of Webers. First off, you need some big ass carbs to run a 383. I would suggest no less than the equivalent of a Weber 40.

The air flow of the 4 bbl conversion sucks... No matter how they are made, the end result still sucks.

You need a down draft setup. Much like the AC Cobra setup.

These guys sell them: redlineweber.com

Also, as a photo example, the Ferrari 308:

Resized Image

Or, the Cobra 289 (this is the best pic I found, it is a scale model, but it gets the point across):

Resized Image

The neat thing with the downdrafts, you can easily get/make an airbox that will draw in cool air.

The neat thing about Webers is how they are set up... they would sell you a jet blank and a set of cool little drill bits. You start with the smallest logical bit and drill... once you get the right jet size, order accordingly.
Posted on: 2009/2/1 7:08
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BillH Re: Anyone got experience with side draft carbs?
The Stig Moderator
Reno
22702 Posts
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2007/12/25 0:00



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I run a modified 32/36 DGV Weber on the Formula Ford. It's probably the easiest Weber to tune.
I was in a raceshop this month watching their "Weber Wizard" work on 6 Weber downdrafts trying to get them even on a Ferrari. Took him about 4 hours.
Webers almost have too many pieces you can calibrate. But when they're set up rignt, they rock.

The sidedraft Mikuni's look pretty cool.
I have a soft spot for Mikuni, especially the slide carbs, from racing bikes and karts.
Posted on: 2009/2/1 14:00
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BrianCunningham Re: Anyone got experience with side draft carbs?
Senior Guru
Boston, MA for the most part :)
7763 Posts
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2007/12/30 0:00



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Quote:

cuisinartvette wrote:
Google Kinsler injection.

Cool stuff


You can get them in EFI as well

http://www.kinsler.com/page--GM--17.html

Resized Image
Resized Image

They're the ones that do the C5/6R, and Indy manifolds for GM
Resized Image
Posted on: 2009/2/1 17:57
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Durango_Boy Re: Anyone got experience with side draft carbs?
Elite Guru
Columbia, MO
2583 Posts
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2009/1/30 21:54



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Quote:

Blade_1 wrote:
Can the intak-ing be routed forward, away from the headers?



I'm actually planning a cold air system for these side draft carbs.

I'm looking at running some intake tubes from the carbs where the breathers bolt on, forward diagonally towards the wheel well. I'm going to have the tubes, two lengths per side, exit the engine bay into the wheel well where it will shoot across over the wheel, and back into the nose of the car.

There is plenty of room in the wheel well for the small diameter tubes side by side, and the install would be clean and neat in the engine bay.

in the nose, they would share a cone filter, one on each side, that's easy to reach and replace. I'll have to simply make the carb flange adapters for the tubes, and then collectors and cone filter adapters in the nose.

Should give me cold air and almost no restriction.
Posted on: 2009/2/2 16:33
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Curtis1974 Re: Anyone got experience with side draft carbs?
Elite Guru
Bolingbrook, IL
1070 Posts
Member since:
2009/2/13 23:02



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Quote:

Durango_Boy wrote:
Quote:

brut wrote:
I love seeing things "out of the ordinary"....you have any sketches?



Here is the setup I have, and then how a dual side draft setup looks on a 350.

I plan on a more modern adapter that brings the carbs in closer to each other and flows better but that is basically how they look.


[IMG]http://i106.photobucket.com/albums/m242/durango_boy/Mikuni001.jpg[/IMG]


That thing is going to look sweet on there!
Posted on: 2009/2/14 23:20
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400hp427vette Re: Anyone got experience with side draft carbs?
Senior Guru
Long Island, NY
373 Posts
Member since:
2009/3/5 2:26



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Quote:

Durango_Boy wrote:
Quote:

Blade_1 wrote:
Can the intak-ing be routed forward, away from the headers?



I'm actually planning a cold air system for these side draft carbs.

I'm looking at running some intake tubes from the carbs where the breathers bolt on, forward diagonally towards the wheel well. I'm going to have the tubes, two lengths per side, exit the engine bay into the wheel well where it will shoot across over the wheel, and back into the nose of the car.

There is plenty of room in the wheel well for the small diameter tubes side by side, and the install would be clean and neat in the engine bay.

in the nose, they would share a cone filter, one on each side, that's easy to reach and replace. I'll have to simply make the carb flange adapters for the tubes, and then collectors and cone filter adapters in the nose.

Should give me cold air and almost no restriction.


WOW, I would love to see this project as you go along. Please keep us updated
Posted on: 2009/3/10 3:31
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Durango_Boy Re: Anyone got experience with side draft carbs?
Elite Guru
Columbia, MO
2583 Posts
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2009/1/30 21:54



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Quote:
WOW, I would love to see this project as you go along. Please keep us updated



I will for sure as I move forward with it.
Posted on: 2009/3/10 9:56
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Little-Mouse Re: Anyone got experience with side draft carbs?
Guru Newb
7 Posts
Member since:
2009/3/25 2:24



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DB
The side draft carbs or webers are designed to be used on individual runners, each throttle bore has its own individual runner generally with a very nice strait path runner to the head. Think about what will happen to the carb that is ment for one cylinder pulling out of each individual throttle bore now put on a plenium manifold. Besides screwing up the individual part of it if you look at your picture regardless if you change the distance on the carb spread, between the manifold runner of the head
to the carb flange you have created almost a 180 degree bend. What bogus told you is correct other then the looks value you are creating a mess. Air traveling in as strait a path as possible is always a good thing two 90 degree bends in the runner not good. then there are certain runner lengths that are known to be good for an engine things like goofed up runner length messing up power bands.

I'm not trying to be negative, looking at single four barrels on an engine is a little boring everyone has one. Consider something else.
Posted on: 2009/3/27 17:54
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BrianCunningham Re: Anyone got experience with side draft carbs?
Senior Guru
Boston, MA for the most part :)
7763 Posts
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BTW Magnacharger's old twin supercharger kit used sidedrafts

Photobucket

Photobucket
Posted on: 2009/3/27 18:25
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/
383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes
NCCC Governor: http://BayStateCorvetteClub.com
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Little-Mouse Re: Anyone got experience with side draft carbs?
Guru Newb
7 Posts
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2009/3/25 2:24



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Two superchargers would work they will cram air in big time
just a matter of enough fuel to not go lean. But NASP
engine trying to suck air/fuel in through a carb ment for strait individual runner's, now with open plenium, different deal. How much suction is being put on the individual throttle bore ? compaired to open plenium ?
runner length now looks to be very long almost a 180
degree bend in the runner from carb flange to head runner opening.
Posted on: 2009/3/29 7:15
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Rodmaster2000 Re: Anyone got experience with side draft carbs?
Guru Newb
1 Posts
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2011/1/26 4:50



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What did you finally end up with for side draft carbs? I have a pair of Mikuni 40 mm carbs on a B & M 4 bbl adapter that mounts right to the 4 bbl intake. Each 40mm 2 bbl sets on each side of the adapter. Anyone interested in this set up at $850? That is a real steal!!!
Posted on: 2011/1/26 4:59
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