If you don't come right I have a full set . If you find a single carb just be sure to check the progression holes are matching .
What has gone wrong it? I ask as I recently had a problem with one also. An internal fault meant it leaked fuel down the butterflies when it got hot. Did't do whilst cold.
I can get you one, off an early Gt4' might not have all the bits and pieces, leaky lead plugs and throttle bearings......
John, short version of a long story. Had engine rebuilt in UK about 2 years ago. including work on a weeping carb. The engine hasn't been right since. Intermittant knock/ shudder at idle. tracked down to 5/6 cylinder. Cannot get cylinder 6 idle air flow to match all other 7 cylinders (even using air correctors) Suspect butterly issue causing the problem/ a bit of crud in the idel circuit. Using a colortune plug you get a blinding white flash in cylinder 6 coinciding with the shudder - i.e carb going lean at idle (suspect associated with an attempt at resolving a leak on the plug in the centre front of the carb). Not an issue off idle/ above 2500/3000 rpm. Cannot find the reason, suspect there is crud in the idle circuit that I cannot get out causing fuel starvation intermitently. Hence why the question, I want to swap it out. Great compression in all 8 cylinders north of 215- 220 PSI (10.5 compression pistons). cylinder 6 interestingly gives 230 PSI....... on a compression test
ebay Germany, the ad says they can ship worldwide and alter the jets to your needs at no additional cost. http://cgi.ebay.de/Weber-40-DCNF-12-Vergaser-/160579938613?pt=DE_Autoteile&hash=item25634f6935
This is a four-bolt top DCNF... Our 308's used a five-bolt top (I'm not talking about the air-horns, but of the actual cover of the carburetor. This will not work with the stock air-box).
Tom, You can match up Webers by their series suffix (40 DCNF-45, 46, 47, 48). Side to side they differ by mixture screw orientation and back to front by interchangeable linkage. What series are your carbs? Bill
Have you thought about sending it to an authorized service center like Pierce manifold, there must be one in the UK also?? I have taken my carbs all apart, and several experts have told me there is just about nothing that cannot be fixed??? Rob
Tom, you need a matching DCNF to do this right. In other words, while you can probably find a DCNF that is dimensionally the same.....and you can match up the jet settings...but you need a DCNF with matched progression holes in the throats. The size and orientation of the progression holes has a large effect upon the AFR and overall tune. It's a common mistake to install a non-matching DCNF when one goes bad....it's a recipe for frustration as with different progression holes that carb will flow different amounts of fuel throughout the rpm spectrum than your other three. It'll run, just not well.....even if you match all the jetting and other variables. Nothing worse than buying a carb'd 308 and finding the carbs are all mismatched.... Good luck and persist!
Thanks guys, I will pull a carb next weekend to get the full version number and post to see what is laying about.....
I had a similar situation to Tom, where i needed a temporary carb to trouble shoot what I thought was a screwed up carb. So i installed an early carb off a GT4 with different progression holes than the other 3 US late model carbs. Thing ran like a champ with the non-matching carb. I would up trading carbs with someone on FChat to get 4 matching carbs.
I have been studying carbs and distributors for a while. At least the Euro, 35, 36, 37, 38 and the US early 45, 46, 47, 48 sets have the same holes but some different jets, tubes, etc. Image Unavailable, Please Login Image Unavailable, Please Login
I would strongly recommend contacting the above company. I have just spoken with the owner who has suggested a few options available to you. Paul
