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Williams on Carbs



  Fiat Coupe 20v turbo


My mate has some Weber carbs that he was going to use on a 2.0 XE for a mini but he is now using a turbo lump so I can get them cheap off him. He reckons that they will work fine on the Williams, I dont know much about carbs though and was wondering if they would work with headwork and cams I am planning? Help anyone?
 


Carbs will work, and many people retro fit carbs to modern injection engines for installation simplicity and cost when they stick the motors in classic or non OE cars.

The easiest way to get them running is to use one of the available DCOE flange manifolds, use a adj pressure reg before the fuel rail/lines that pass the carb foat chambers, then return the fuel to the tank ala the existing lines. Youll need to sort out either a crank or dizzy triggered electric ignition system as your ECU wont be able to handle it without running injection properly.

You might be a bit dissapointed since intake temps will be far higher and youll loose power through decreased density, and the decrease in restriction will be offset. It wont drive as smoothly and itll take a fair bit of rolling road time to get setup. It wont be perfect as DCOEs al always a compramise, although you can spend far too much time honing the inlet tract, chaoke profiles, tapers, aux venturi to make it pretty darn good. Still, itll be a step back in essence.
 


ben i would say that you put that very well,iam a lover of carbs but i wouldnt play with a willy and carbs even throttle bodies are that great unless enough time and money is spent refining them.
 


I have twin 45 Dellorto DHLAs on my 2.0XE Westfield, combined with a bonnet exit manifold and zorst, got just over 180bhp. Standard XE is 156 IIRC.. so there is a definate benefit on the correct motor!

Although they do take a lot of fiddling and constant setting up!
 


i take it thats a red top vaux lump they seem to love carbs i had a 1.6 8v vaux engine bvh cam etc showing nearly 150 bhp top engines
 


true, the std C20XE will make fantastic power with very little modifications simply due to a good design from the off. Throttle bodies will invariably give not only far better top end, circa 190bhp with far more tratability, torque and part throttle control, this is where the carb falls by injections wayside.

Do you run 3d ignition, its a godsend for carbs lol.
 


I dont actually, that is the next step.. Moving to MBE. At the moment I am running a cavalier 8v carb dizzy, coil and amplifier.. Works a treat and get beautiful pops and bangs on overrun!
 


ant iam currently building a red top for my kit car i may be interested in your old bits if you wanna flog em just so i can check my engine is sound pm me cheers
 


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