Ive been introduced to a complete 45 weber carb set up, the chap wants 500 notes for the lot, ive offered 450 and waiting for him to come back to me. They have not been used in 2 years and they are jetted for a 1800 16v. So a service, Jets and a rolling road for a minimum. Ive been wanting carbs for ages, changed my mind, then had second thoughts,then ive got that urge again. What Pros and Cons should I be aware off ?
Basically they need to be *very* well set up otherwise you suffer from flat spots in the rev range, how tuned is the engine the 45s are going to be installed on? You might be better off with a set of 40s!
depends what you want really m8? im of the thinking that all cars should come from the factory with twin carbs so id always say yes! youre right about the setting up/rolling road time though,even if they have been jetted for an 1800 16v. servicing/rebuilding them is a good idea,should garentee that they wont go 'out of tune'
Sounds like a lot of money for 2nd hand carbs...does it come with the manifold and filters as well at that? Better value if it does...
I assume there's a manifold, pump, linkage, etc at that price. The going rate for good condition 45mm DCOEs or DHLAs was 350 or so the last time I looked, compared to about 200 for very good 40s. If it's a road car then chances are you won't want to go above 36mm chokes so it may be better value finding a nice pair of 40s. I run 32mm chokes on my 9A with KR cams and they give monster torque.
They would be going on my ACE 2Li 16v completely rebuilt block, and will be going in my syncro project. The set up is complete with redtop, socks, twin cables linkage, manifold,the lot. greg, What sort of torque levels are you getting mate 160+
40's are too small for a Valver really IMO.... Id question the wisdom of carbs when K-Jet will happily provide fuelling for 180+BHP such as with GVKs'/Iguanas' & Tubs cars (albeit with 1900 or 2L blocks) Carbs will give a nice noise, but poor economy & need "proper" setting up to see anything like a decent power return from them.... My 500 sheets would go on a decent 4 branch or flowed head to pep up an 1800 16v. Alternatively what about a set of Kent 1602R cams? KeithMacs car made 165BHP with them A friend of mine has recently put twin 40s on a 2L ABF in a mk2 track car & wondered why Nickvw in his standard 100 Jetta KR 16v was keeping up in a straight line... Edited by: chrismc
I recon I am going to go for it anyway, if he will take the money, You can feck up a set up with anything, ive managed 81bhp out a 16v so anything is possible, I will get it set up on a RR so I don't get it wrong or if I do they can correct it, ive also heard of major problems, but I am going to risk it. wish me luck
Just to remind you, that 40 or 45 refers to the carb body size. What's important is the size of the changeable choke within the carb. You can get 40's and 45's with the same choke size. I think the biggest you can get for a 40 is 34mm, which although may not give the ultimate high revs bhp of a larger choke size will probably give much better throttle response and torque.
A 36mm choke is the max for 40s, which coincidentally is the size that most of the "You need 45s for a valver" mob have fitted in their 45s...
^^aye depends what you want though,if planning future head work etc id say go for 45's anyway. at least you can then step up the choke sizes if needed,trumpet lengths can be played with too. saying that,i dont know what the ace engine is? mark, carbs hold fuel,and jets are used whereas bodies are the same sort of idea but use injectors which are more precisely controlled (leccy managed) and dont have to hold fuel. same sort of idea though,a trumpet looking directly into the ports.
45's will suit a 2.0, i had 40's with 36mm chokes, i got 168 bhp/145lb ft. my local tuner kept on telling me i need 45's yes it had a few flat spots (mainly at the bottom end) but it went like stink.....down side, 20mpg at the best! but i do miss the sound
One is a carburettor, the other are throttle bodies (fuel injection with one throttle butterfly per cylinder) Have a look at Jenveys site. Doh, just read rileys post. I think i'll feck off to work out of the way Edited by: GVK
I know that everybody keeps saying how Kjet is a more than capable of the providing enough fuel for moderate tuning and it's a step backwards to go to carbs, but then why do the NA VWcup cars ala Carvell/tippet etc all go to carbs over Kjet, IIRC tippet has only recently changed over to carbs and has found a chunk more HP.
The Carvell/tippet cars are 8v...so increases in breathing are at a premium. They are also proper race cars..bit of a different situation to a fast road valver I guess they can mess with choke sizes too, to give the right characteristics for track work...
