But they'll be stock heads not the 'big valve' jobbies I guess. This is an AP right? If so they'll be stock bus heads not 914/411
I dunno, I'm not that clever, they look fine and there are no cracks, in fact aside from carbon and crud they look to be in good condition.
Mine are Weber DCNF 40s. No idea on the manifolds and I think the linkage was made up to suit. @Bertiebot had them on his type 4 1800 and then bought a set of new IDFs, so I bought it all as a job lot with manifolds, filters etc.
Hi @Joker, looking at your comment on Single Carbs being crap... the bus I bought last year has a 1970cc T4 engine (CJ043513) that has been fitted with a single Carb. What effect does this have and why would a twin set be better?
I had an original solex twin barrel carb set-up which wasn't so bad. However, it always ran rich, especially when the second choke opened, the length of the runners stope the fuel air mixture vapourising properly. The twin barrel webers suffer the same and are hard to set up. The issue is the distance between the carb and the inlet manifold as the manifold runners are too long. As there is no warm air riser the runners and carb are prone to icing. Regardless of this these carb set ups constantly over fuel. Check out the samba for loads of detailed threads on the subject. I actually made my own warm air system which worked reasonably well on my solex carb. Twin carbs are set up directly on the inlet, no icing risk, if they're short enough warm up is quick, fuel is metered out precisely and although a lot of people think that twin carbs will use more fuel and will be harder to set up the opposite is true. VW designed the type 4 with twin carbs and FI, not single carbs.
Oh, and on a back to back comparison, I built a new 1800 engine, the twin barrel solex carb versus 40mm dells equated to a difference of 20hp
The inlet tract is too long. As @holmsen states, when it's cold the fuel condenses on the manifold walls so the mixture goes to pot. Also, because the inlet tract is so long you get a delay between hitting the throttle and getting some acceleration, like a flat spot. You also get a flat spot on the EMPI (Weber copy) 32/36 carbs because there's only one accelerator pump just, so it goes lean when the second choke opens before the fuel flow from the main jets catches up. Twins are way better all round.
£800 - £1000 new/new old stock/refurbished complete. £500-£600 for a good used set which have had a rebuild. +£100 to £150 if you want k+n's + more for velocity stacks. I haven't installed my CSP bell crank yet so can't comment, it looks like a nice bit of kit. The cb performance et al hex bar linkage set up has worked ok for me but can be a pig to keep in check
I'd sell my 40's with K+N's, cb linkage and short T25 manifolds for £700 which is basically a not for sale price
I know...I'm not disputing it, but as twins have become the 'go to' mod for decades, the price for old technology has remained constant, or increased, if anything.....during the same time, the price of EFI has come way down, by comparisson, and the flexibility, reliability and economy are chalk and cheese. It's just that fuel injection is still perceived as 'new fangled' or some kind of black art.... Show me a modern car that uses dizzy and carbs.... I'm not advocating one or the other tbh....I grew up on points and carbs, so I'm happier fiddling with the familiar.....but for a long term keeper, I'd look to EFi
I'd be interested in EFI at some point, especially if we head towards emissions restrictions on old vehicles. I love twin carbs, but they are definitely not the best solution technically.
Price based on Eurocarb and/or cost of sourcing carbs/linkages/manifolds separately. It's not common that a full type 4 set up comes up on here or somewhere like VZI/eBay. If you paid nowhere near that for a refurbished set complete with manifolds linkages and k+n's you did very well
It requires patience to get a good twin setup at sensible money. You can drop on a full setup from time to time, or buy up bits on ebay when they're going for a sensible amount of money. Dells are fitted to Alfa 33s, although usually advertised on ebay as suitable for VW and hence attract high bids. If you could find a 33 at a breakers, you might drop on a pair for cheap money. DCNFs were fitted to MG Montego / Maestro, V6 ford Essex engines, some twin cam Fiats etc. Keep an eye on the classifieds here or put in a wanted ad.
Yes, I was lucky really, but when something comes up, you have to go for it quickly. Seen sensible prices on here before too, just they don't come up very often.
