rebuilding double webbers

[TomCrowley]

I pulled these off my 240z parts car and I am looking to rebuild them and put them on my 280z with a stroker motor. Any tips or concerns I should have and where to find a rebuild kit in general.I know they are in pretty rough shape but they are definitely rebuildable.

[Blue]

Stick with SU's or get triples.

The weber downdrafts are not performance carbs. They are optimized for fuel efficiency and WOT.

DGV's are generally used to replace slightly more complex but similarly designed carbs on Japanese engines that the owners and their mechanics can't take the time to learn how to troubleshoot.

[LeonV]

I pulled these off my 240z parts car and I am looking to rebuild them and put them on my 280z with a stroker motor. Any tips or concerns I should have and where to find a rebuild kit in general.I know they are in pretty rough shape but they are definitely rebuildable.

Follow me here, Tom.

Step 1: Toss DGVs into nearest garbage can.

Step 2: Install triples.

[TomCrowley]

how much of a performance difference are we talking? 2 double barrel carbs doesn't seem like a fuel efficient setup. and if triples are that much better is there any way to get them for under like a thousand from what i am seeing online?

[Blue]

The Weber double barrels have a two stage design. The first is designed for fuel efficiency at idle and cruise by providing a very narrow throat. (Japanese double barrel carbs are even more efficient as they typically have solenoid driven fuel cut circuits, bcdd circuits, and two inter-working idle stages etc.


The problem with down draft carbs on an inline engine is that the fuel and air charge has to turn 90 degrees. Down draft carbs are geometrically more optimal on "V" engines than on "I" engines.

[Zedyone_kenobi]

If you cannot get around the price for triples, DO not be afraid to call up Ztherapy and get some 'hot' SU's built. they are Great carbs and when fresh can give you a fantastic driving feel and good performance throughout the rev range.

SU's are wonderful simple carbs that still give pretty good tuning opportunities.

[Blue]

Not sure if these are Weber's of fake Weber's: Datsun Nissan 240Z 260z Triple 40 Dcoe Carburetor Kit | eBay


Real:
Datsun 240Z 260z 280z ZX Fairlady Z Triple Weber Carburetors Cannon Manifold | eBay

[Zedyone_kenobi]

me thinks those are knock offs Blue.

NO Weber logo, and the screws look more generic. The Manifold is also not a Cannon, but a clone of a cannon. I do not even want to think how bad that will fit. The Cannon is sub par.

[Blue]

yeah I read about Chinese knock offs...may be this is a first sighting. The ad does not state "weber" only DCOE however they do have "weber" in other ads. Maybe they are coming out of Spain given the recession?

[LeonV]

me thinks those are knock offs Blue.

NO Weber logo, and the screws look more generic. The Manifold is also not a Cannon, but a clone of a cannon. I do not even want to think how bad that will fit. The Cannon is sub par.

I suppose they could be. However, all signs point to the vendor being Pierce Manifolds.

The Manifold is definitely not a "clone" of the Cannon, but a TWM (who I believe is owned by Borla now). Considering Pierce supplies these manifolds, that's one clue. The other is the location being Gilroy, CA and the fact that they're selling so many Weber products...

Best bet would be contacting the seller and asking what's up, as that's a good price.

[Blue]

Tom,

If you are going to rebuild those, soak them in a strong solvent first to clean. Disassemble then clean the inner passages

Rebuild and use kits like these:

Rebuild kits are at pierce manifolds 28/30 DGV,32/36 DGV, 32 DGR
92.3238.05

or

webercarb direct 32/36 DGV DGAV DGEV Rebuild Kit

You may have to tune by changing jets.


Here is an article on rebuilding the progressive sync'd version Weber DGAV Carb Rebuild Guide | Classic Ford



Here is an exploded view: http://www.piercemanifolds.com/v/vsp...oded_DGV5A.gif


More info here: Tech Wiki - Weber 32/36 Carburetor : Datsun 1200 Club


I also added a couple of files with DGV info within.

[Zedyone_kenobi]

I suppose they could be. However, all signs point to the vendor being Pierce Manifolds.

The Manifold is definitely not a "clone" of the Cannon, but a TWM (who I believe is owned by Borla now). Considering Pierce supplies these manifolds, that's one clue. The other is the location being Gilroy, CA and the fact that they're selling so many Weber products...

Best bet would be contacting the seller and asking what's up, as that's a good price.

gosh, that would shock me if it was Pierce and they were fake
I have had nothing but great experience with Pierce.

[TomCrowley]

ok thank you all for the input but I do have 2 single carbs and i am not sure if they are anything special either i think they might be the su ones you are guys talking about (i bought all my datsun parts and cars wholesale). and also i am just getting into this whole datsun thing so i am learning everything i can. i figured the double webbers would be much better but from what i see su are the best bang for your buck.

[Blue]

Yup. You can probably sell the DGV's for $100 each to the small chopped truck crowd

[fiveleaf]

I am also in the process of rebuilding triples, and just bought 3x rebuild kits & manifold vibe mounts from racetep.com. When I called, I asked them to pricematch (as they advertise) webercarbsdirect.com, and their response was that the DCOE rebuild kit from webercarbsdirect uses non-genuine parts from Japan. I don't know who's right, but I paid a little extra and went with racetep.
Weber Carburetors. 818 764-1901 Carbs 40 DCOE 45 DCOE 32/36 32/34 Jeep. Top-End Performance 818 764-1901

If I remember correctly, there is a great write-up done by someone on this site about cleaning up the exterior of a set of triples. I've been looking for it for the last 30min, was it ZsOnDaBrain? Was there extensive use of a dremel? I'll continue looking around for it, it might be useful to add to this thread.

Also, Tom, I have a bunch of pages from Pat Braden's "Weber Carburetors" that you should read. I'll send them to you; give me your e-mail address?

[71Nissan240Z]

I refreshed a set of these for a friends car once. Took all the needles out and blew carb cleaner through all of them. Make sure u lable each needle and emulsion tube as theres two circuits in each dgv. They are okay carbs. Better than the flat tops by a mile. But after doing this his car is running decent. Dcoes are the bomb. Im hoping to get a pair of old ones to rebuild. Right now i have ztherapy su with sm needles on my lightly modified l28 w/flattops. I love my sus and im convinced its miles more reliable than that junk ltronic fuel injection on the 280zs.

My. 02