Weber Carb 32/36 versions. Which to choose

[Greg]

I'll start with the question at hand, what carb should I go with?
When calling for jets to attempt more experiments in rejetting the tech at http://www.racetep.com/webcarb.html#3236 said the DFAV carb I have is the bad choice for my car. He recommended the 32/36 DGV (or DGEV) or the larger 38DGES carb for my 200CI I6. He said the top half of the DFAV was too small. Even though the venturies are the same size he said the DG?? series flow better and the internals of the carbs were different.
Sould I scrap the DFAV I currently have and go with the DGV or 38DGES? Does anyone recommend any other carbs? I originally called RaceTap.com to order their jetting kit to see what sizes they recommended.


I have had problems with my 32/36 DFAV (although converted to electric choke) I bought from Stovebolts a year ago. During the winter it took about 20-30 minutes before the idle quality would return (engine comes out of fast ide in ~ 45 seconds). Until the 20-30 minute were up the engine would stall If I didn't keep the idle excessively high. During the summer the same jetting would idle at a reasonable level and performed fine (more power than 1 brl). Although, it never idled as good as the 1 brl.

I switched back to the original carb for the winter and the engine ran relatively well. It was not a perfectly new car smooth idle, but with the cam I put in a year ago (CSC-264-12-DHS 264/274 214/224 .450/.450 .480/.480 .495/.495 112* 1600-5400) I'm assuming a little rougher than stock is normal. It idles in drive (automatic trans) with just a little more vibration than stock (I'm picky). If I was rebuying the cam I would recommend smaller. Maybe a 260.


Other Specs:
Clifford Headers
Stronger valve springs with Cam
D7 Head Casting
Head milled to combustion chamber volume 52cc
~8.7:1 compression ratio
DuraSpak II Ignition

The car ('67 mustang) is a driver. My goal was more power but I want to maintain a smooth running engine. I went with the larger cam assuming I may someday upgrade to a better flowing head (how goes the head design Or, Mike when is the fuel injection comming out?

Thanks,
Greg

 

[robbinsj]

I put a 32/36 DGV on my 250 and got great results. It was a brand new carb and I had no idle problems at all. Got better power and better mileage. I upgraded to a 38 DGAS in anticipation of a rebuild with the same cam you have, the 264/274 112* Clay Smith. I also have the 1.65 full roller rockers and Clifford dual headers in this daily driver. After getting the right timing set it idles well, just a shade lopier than stock when cold but seems to be just as smooth once it's warmed up, which only takes about 4 minutes. I don't think the 38 is too much carb for a 200 if you have that cam, especially since you can custom jet it for your car.
-Joey

 

[jamyers]

No offense to anybody, but I've become a little suspect of the non-Ford Weber "vendors" (ie, redline etc) when it comes to our application. They seem to have a one-size-fits-all mentality, coupled to a know-it-all approach that's turned me off on them. (Like their "tuning advice" that only includes the primary idle jet and totally ignores the other 5 jets...)

I've got a DFV and a DGV series carb, and apart from the shapes of the air cleaner bosses, I don't see where they are all that different - makes me think the guy you spoke to fits my above stereotype.

By FAR, the best source of info I found ANYWHERE online was right here in this thread: http://fordsix.com/forum/viewtopic.php? ... highlight=

After tinkering around for awhile with my DFV on a stock 200, I ended up going to Stang200's 6-cylinder jetting, and it's running like a champ - although I'm not sure what a non-stock cam would want - there's some really good reading in there, especially five10man's comments.

(I swear, if somebody would write a decent tuning book just on the DGV/DFAV series, they'd make a killing!)

 

[Greg]

Well, I removed the old 1 brl and put the 32/36 DFAV back on for the summer. Car is running pretty good (its at least in the 60s today). I think I just need to look into some high speed issues (bigger secondary jet and look into the ignition advance).

Maybe I'll just get the manual choke conversion kit and try it again next winter.

The car picks up and accellerates well. It is a very smooth accelleration and doesn't have a problem until your at highway speeds (above 55) and you give it throttle such as when passing or going up a hill... Around 65-70 MPH it seems to loose torque.

My last recorded jet configuration is below, but I want to go more towards the sugested... 160s...

Last notes of current jets (I need to order some jets)
Primary Main - 145
Secondary Main - 165
Primary Air - 140
Secondary Air - 160
Primary Idle - 70
Secondary Idle - 50


Next try for jets will be below, but the guy from redline said there are no 060 pump jets??? and didn't recommend keeping the DFAV carb...
Primary Main Jet 160
Secondary Main Jet 160
Primary Air Corrector Jet 185
Secondary Air Corrector Jet 175
Primary Idle Jet 075
Secondary Idle Jet 065
Pump Jet 060

 

[jamyers]

I'd say to heck with what the Redline guy says, he's trying to get you to spring $300+ for a new carb (imho). Plus, if you go to a DGV, it's a mirror-image of the DFV, so your throttle will go the other way...

Whatever you do, don't buy jets from Redline, they're outrageously expensive!!! The best (cheapest) source of jets I know of is through alfa1750 on ebay, his store is at: http://stores.ebay.com/ALFA1750S-CARBUR ... ARTS-STORE. $2.00 each, flat shipping $4.50. You plug in how many you want at that price, and then in the details you give the jet sizes you want. (he's good at emailing if you have a question on them) Only drawback is they're coming from Italy so it takes 2 weeks to get them (but for the price you can get an assortment!)

From what I've gathered, the pump jet isn't that big an issue on these carbs, unless yours is going flat when you floor it (which it doesn't sound like) I'd leave it alone.

I'm also NO expert on them, but mine had a 140-something main jet (and a huge air corrector) and also seemed to lose oomph at speed until I changed them.

BTW, What sort of ignition system do you have? Any idea what the advance curve looks like?

 

[Greg]

I have the Duraspark II ignition. The vacuum produces about 18 additional degrees of advance, but I'll have to check the mechanical advance...
I just Emailed the Alfa about the jets...

Thanks for the advice,
Greg

 

[jamyers]

Doh! You said Duraspark 2 in your first post, sorry about missing that...(was afraid you were going to say Load-o-Matic)

Also, if you want an electric choke, you can get one of these for $10-12 plus shipping (half of anybody elses price). Just be aware that they're for DGV's, so you'll have to doublecheck the movement, and prolly will have to remove and flip the coil over (not too hard to do, especially for the price!)

http://cgi.ebay.com/ebaymotors/Weber-Ca ... 8049604173

http://cgi.ebay.com/ebaymotors/Weber-Ca ... 8052738615