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Chevy Dualjet carbs?

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CZLN6
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Chevy Dualjet carbs?

Post #1 by CZLN6 » Wed Sep 30, 2009 12:04 pm

Howdy:

I'm looking for info on the rochester Dual jet carb, intake and exhaust system that came on Mid-80's Chevy pick-ups. What years were they produced? Any websites or links?

Thanks, in advance.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

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StrangeRanger
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Re: Chevy Dualjet carbs?

Post #2 by StrangeRanger » Wed Sep 30, 2009 7:49 pm

How's this for starters?
Rebuild kits and links to the manual
http://www.carburetor.ca/carbs/tech/Roc ... index.html
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
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CZLN6
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Re: Chevy Dualjet carbs?

Post #3 by CZLN6 » Thu Oct 01, 2009 11:36 am

Howdy Back SR:

Yes, I found that one, but it doesn't give the specific info I'm looking for. So far, I've found that the progressive Rochester two barrel and the dual exhaust manifold was a one year option in 1983. According to Tom Langdon the whole system upgrade was good for a 20 - 25% increase in power and possibly an increase in mileage for a factory designed bolt-on. The two most promising listing #s are 2SE and/or E2SE.

Questions-
*Is it a true dual stage carb? It is sometimes describes as the right half of a Quadrajet, and other times as the front half.
*What is it's rated CFM?

Thanks Strange. Keep it coming.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

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jamyers
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Re: Chevy Dualjet carbs?

Post #4 by jamyers » Thu Oct 01, 2009 5:43 pm

CZLN6 wrote:Questions-
*Is it a true dual stage carb? It is sometimes describes as the right half of a Quadrajet, and other times as the front half.
*What is it's rated CFM?

Dualjets are the front half (primaries) of a Quadrajet. The non-electronic ones make good 2-bbl carbs - great venturis, boosters, and lots of tunability between the rods/jets/air bleeds.
I'd get a copy of Cliff Ruggles book on Q-jets, most of the work to be done on a Q-jet is on the primary side and float bowl.
I'm not familiar with any Rochester progressive 2-bbl carb, got a link to info on one?

Regarding the CFM ratings, I don't know directly, but on a Q-jet the primary side was either 150 or 200 CFM, depending on whether it was a 750 or 800 CFM Q-jet (all Q-jet secondaries are 600 cfm). Look down inside the primary bores to see the difference between the two - the 800CFM units have a 'bump' in the venturi ring, and the 750 ones don't (but have a smaller venturi). Throttle plate diameters will be the same regardless.
James - '62 Ranchero (200cid), '71 LeSabre (464cid)

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a1953mdl

Re: Chevy Dualjet carbs?

Post #5 by a1953mdl » Tue Nov 10, 2009 11:39 pm

May not be exactly the same, but I have a Rochester 2 bbl "VariJet II" off a 78 chev 250 with the integrated head. The front butterfly is smaller than the other and I seem to remember it being progressive. I will try to verify that tomorrow.
Hope that helps.
Lee

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Re: Chevy Dualjet carbs?

Post #6 by CZLN6 » Wed Nov 11, 2009 12:24 pm

Howdy Back Lee:

That's the one I was looking for. I believe it is basically the right or left half of a QuadraJet. Making it a two stage, progressive two barrel. You've relite that candle. I'm off on another search. Thanks.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

junkyardjeff

Re: Chevy Dualjet carbs?

Post #7 by junkyardjeff » Sun Nov 15, 2009 9:52 pm

I think its the same carb that was used on the chevette and the early 2.2 chryslers and maybe the late pintos

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jamyers
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Re: Chevy Dualjet carbs?

Post #8 by jamyers » Sun Nov 15, 2009 10:52 pm

Aha! Rochester VariJet was used on the Chevy Citations w/ the 2.8 V6, circa 1980.

And yes, it's a progressive 2-bbl. My bro-in-law had one (in a Citation), and liked both the car and carb.
James - '62 Ranchero (200cid), '71 LeSabre (464cid)

The ONLY safety device we need is a 6" sharpened steel spike bolted to the center of the steering wheel of EVERY vehicle.
Emergency Rooms and Funeral Homes will be busy for a week or so, then I predict a dramatic drop in vehicle accidents.

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Re: Chevy Dualjet carbs?

Post #9 by fmartin_gila » Wed Nov 18, 2009 6:42 am

The Progressive 2 barrel as used on the Pinto is a reversed Weber 32/36, and is a very adaptable carb, as is the 32/36.

Fred
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roghax85
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Re: Chevy Dualjet carbs?

Post #10 by roghax85 » Sun Apr 22, 2012 6:28 pm

Hello All

I am try to install this carburetor to my L200.

somebody can tell me if it is a good choice?

I am living in Honduras, and I dont can get another carburetor.

the exacly carburetor is it:

CK202 DualJet M2ME
http://www.carbkitsource.com/carbs/kits/CK202.htm

Thanks and sorry for my English
1966, coupe, Mustang, 200cid C4. Honduras

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Re: Chevy Dualjet carbs?

Post #11 by MustangSix » Thu Apr 26, 2012 12:13 pm

I once owned a 1979 Chevy Monza with a V6 that had a dual jet. It looked the same as that one. Basically the front half of a Quadrajet.

It should work fine on a 200.
Jack Collins

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roghax85
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Re: Chevy Dualjet carbs?

Post #12 by roghax85 » Thu Apr 26, 2012 12:24 pm

Thank you man,

I will put pictures when finish the work.
1966, coupe, Mustang, 200cid C4. Honduras

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Re: Chevy Dualjet carbs?

Post #13 by xctasy » Tue May 29, 2012 1:08 am

The carb is also called the Varajet, and is French made half a 4M Quadrajet. It has been used on 1892, 2838 and 3294 cc General Motor Holden L4 and L6 OHV engines and the European J car Family II 1596 cc OHC 4 cyl engines from late 1978 to 1988. Its an amazing carb, but a little difficult to calibrate because of the a)hanger enrichment and b) rod selections. Jetting probably has to be sourced from RRP (Rochester Re Productions) approved sources, with the V6 and V8 jets too big for these carbs, or getting a jewler to recut a stock small jet to the bigger sizes with the right internal finish, and main hole and chamfer required to ensure the right flow. Jets are close limit, and carfully calibrated for each FMV/EPA/CARB/or ADR aproved engine combination.

Most of the hard performance work for an I-6 engine was done with the standard 114-121 hp carb applications for any GM 2.8 V6, GMH 2.8 and 3.3 L6. Holdens Aussie engines were very different, 76/78/80 hp in the 1892 cc ohv four, the J car 1596 cc 85 hp engine and 102, 114 and 121 hp in the 2838cc and 3294cc. The Rochester Varajet carb on ohv engines was a replacement for earlier single barrel Stromberg carbs, and yielded an extra 10 hp with ease, as well as a massive improvement in fuel economy. On these engines, there were porting changes and ignition system upgrades as well, but emissions were getting harder to pass each year, and 10 hp and about 1 second off the quater mile was a pretty good indication.

In terms of performance, they are neck and neck with the ADM34 carbs used in the Fiat Spyder/131/132 and the brace of 32/36 versions (Holley Weber 5200, 5210, 6500, the Bressel or Weber DGAS 32/36 or Weber DFA 32/36).
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