Hi all, Advice needed please.

I have just had a new 1776 engine put into my squareback and it's running pretty good.....however I had some old caries re-jetted, carbie kits etc put through them. The engine builder wasn't keen to put webers on the engine as he was concerned with their ability to work as well as standard carbies on a type 3.

I'm not totally happy with how their performing, so am considering buying some webers to install.

Can anyone give me some advice on their experience with this same/similar issue and if you did get webers which ones are the sh-t to purchase.

Cheers,
Brendan

Brutus mk.I was a type 3. His first improvement was to fit 40 DCN's (with the smaller standard venturis - 26 or 28mm? -- 32 would be too big), a 009 (as no vacuum connexion), and extractors (to the standard re-coed 1600). These 3 changes made a world of difference.
But the Webers cause problems with tight clearance, even with the type 3 manifolds and squattest air filters, and changing spark plugs becomes even harder. You could simply make sure the PDSIT's have larger main jets etc. to suit, and save the expense.

You probaly could modify your existing carbs, they have a replaceable ventury. these could be bored out or a new set machined, increase the main jet to suit and it will run a lot better, then you can retain the original air filter set up that draws cold air from outside the engine bay.

vwo60, I could never work out how to remove the venturis, on PDSIT's. Is it really possible? They look separately made but sort of encased in the body? If they could be removed and enlarged from 24mm to say 26, that would be great.

It has been a long time since I have had one apart but here is a drawing of the carb, I had a set on a 1776 early in the piece and I bored the chokes out, take the throttle plate off the bottom and remove the screw on the side of the carb, probably hard to get out after years of use.

Thanks vwo60, so all Brendan needs to do is to have the vent's machined out, re-contour and polish them until the carbs 'work' for that size engine. Wish I had done that instead, many years ago. [Must have been puzzling over the 34 PICT, which definitely looks un-removable.] The vent's could go up say 2mm initially? The mains could go to 140 or even 155 (if using original German 32 PDSIT's... The newer Brosol versions seemed very different in jetting req's on the same engine -- still have the details/differences if needed).

Gleaned from The Samba....
[notchboy] Sat Jun 23, 2012 3:06 am
Yes you can use them for a 1776. But you will need to get the jets and venturis from some dual bus carbs. The T3 carbs are based around a 1600cc motor and a 32mm venturi. The bus are 34mm venturi and jetted for 1700 or 1800cc motors. All the parts interchange. Ive made a set of blended carbs, mange has and I think a couple others. Easy to do once you have the bits.