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Location:
Melbourne
Registered:
July 2002
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Twin Carbs
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Tue, 10 February 2004 05:51
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I know quite a few people that would like to know peoples experiences here. I'm not interested in starting a sh#t fight between carb lovers and carb haters.. So please refrain from posting "carbs suck ass" and stuff like that. Just would like to know what people have found from using carbs vs injection.
I think (if setup right and done properly) carbs are a cheaper way to get the same power from an engine as injection.
I've personally had excellent results with carbs on a 4AG and also on my old 18RG.. My only probs were tuning between seasons and very cold starts (mostly the weber carbs on 4AG).. Apart from that they ran just as good as injection. No flat spots etc etc, perfect idle, awesome independant throttle sound and plenty of noodle to boot..
When i first had my 18RG, i hated the twin carbs, cause they were never in tune and had flat spots everywhere.. I took it to a twin carb specialist and was shocked at how perfect it actually ran with the internals (jets etc etc) matched to the mods (cams, head work) and a good tune.
Tell your experiences 
Cheers
Gaz
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Location:
Perth
Registered:
October 2003
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Re: Twin Carbs
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Tue, 10 February 2004 07:47
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I used to have a worked 308 in which i tried/ran three different carbs, rochester quadrajet, holley 650 sq bore double pumper and holley 600 square bore vac sec. The rochester made the engine smooth and better economy, the double pumper was alot less smooth, power came on in more of a hit and used alot more juice, and the vac sec holley was a bit of a comprimise between the previous 2. So in my experience no single carby can offer what fuel injection can, i.e. smoothness, throttle response and fuel economy.
The only two advantages carbs have over injection is cost and simplicity. Technology advacement would show fuel injection is far superior to carbs, nearly 0% of new cars have carbs, might even be zero if they stopped producing morris in India
So bacically carbs suck arse  compared to fuel injection
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Location:
Brisbane
Registered:
May 2002
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Re: Twin Carbs
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Tue, 10 February 2004 13:25
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I don't even think carbs have cost on their side any more. Have you priced a pair of new Weber sidedraughts lately? You'd be doing well to get all the hardware you need for less than $2k! For that sort of money you can get a cheap fuel-only computer and a set of injectors to suit your application and still have money left over.
I had twin carbs on my 2T-G and later 18R-GU, and I thought they were OK until I converted the latter to EFI. After that I realised how much carbs suck, and I haven't looked back since!
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Twin Carbs
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Tue, 10 February 2004 23:33
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For outright power on a N/A engine. there really isn't any difference. The power is pretty much limited to the amount of airflow you can get past the butterfly. The old slide type carbies on bike engines are awesome for outright power as there is absolutely no obstruction.
The problem with carbies is that at best you only have 3 jets per cylinder which limits the tuneability of them, whereas EFI allows many many tuning points. The benefits being smoother response over the entire rev range and better control of emissions.
A question for all the carby knockers out there. With motorbikes, they don't have to comply with pollution laws (bar noise) and power and cost are the primary design objectives. Why don't we see EFI fitted to more motorbike engines? These things are making 150hp from a N/A 1200, and thats a standard engine.
Oh and norbie, you are forgetting all the other parts that are required to get an efi system working.
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Location:
Perth
Registered:
October 2003
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Re: Twin Carbs
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Wed, 11 February 2004 00:16
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With big power V8's and single carbs they run into problems with even distribution between cylinders, hence they usually have to go for 2 like the pro stockers. Butterfly and injector per cylinder like a quad weber downdraft setup would be sweet, pity they don't allow electronic fuel injection.
I was under the impression that most bikes have efi now, i know the hypo ones like ninja's, R series yamas and gsxr zuks do.
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