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Post by ashleydavies18judo on Jun 6, 2009 22:03:16 GMT 1
What would be best for my 1275 engine a twin carb or weber?   |
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Post by Phil J on Jun 6, 2009 22:29:35 GMT 1
Can't help on which would give best performance, but I know the webber will be create a lot more noise, and the twin carbs are a lot more work to get set up correctly  I'm sure someone else will be able to offer more detailed advice, but for looks alone I would go for twin carbs |
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Post by ashleydavies18judo on Jun 7, 2009 14:27:12 GMT 1
oK Thanx anyway for your help |
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Post by gar1380 on Jun 7, 2009 17:16:15 GMT 1
personaly i would go for the weber with an airbox rather than trumpets
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Post by ashleydavies18judo on Jun 8, 2009 20:12:14 GMT 1
ok thanx |
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Post by braceuself on Jul 2, 2009 7:18:36 GMT 1
anyone know the benefits of a twin carb?
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Post by jb on Jul 2, 2009 11:08:34 GMT 1
I don't really know but I was under the impression that they can give a bit better throttle response and fuel consumption than a big single, although possibly not quite as much power. However that's only if they are set up properly!
I think anyway....
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taffy1967
turbo
Forum cagoule
'1959-2000 Original & Best'
Posts: 4,345
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Post by taffy1967 on Jul 2, 2009 11:33:05 GMT 1
From the old article I read in one of the Mini Magz, twin carbs fuel the engine more efficiently and do the job slightly better if you're always ragging it.
But a good single carb like say a HIF44 is pretty good too and can also handle some serious horses.
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exuptoy
1330cc
1980 Rebuild project and 1969 Elf.
Posts: 924
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Post by exuptoy on Jul 2, 2009 12:05:43 GMT 1
Getting it setup is an issue though as the needles will most probably need changing and there are a lot more rolling road loads who know they're way around a weber than an SU.
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Post by dai9fxey on Jul 2, 2009 16:26:47 GMT 1
For road use, SU's every time.
Webers are only really suited for racing / track use where their superior top end fuelling has a chance to work.
Contrary to popular belief Twin SU's are not difficult to set up once you have the correct needles.
The balancing of both carbs is the secret.
Look at it this way, you don't use twice as much fuel with twins, it's just that the fuel is shared more evenly between 2 inlet ports rather than by ONE carb feeding 2 inlet ports.
Twin carbs on a modded 998 are brilliant.
I've got a chart somewhere which shows which carbs to use relevant to engine size and power.
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Post by dai9fxey on Jul 2, 2009 22:12:06 GMT 1
OK, found that "Flow Chart".  A standard 1275 A series pushes out about 55 > 60 HP at the wheels, if you're lucky, so unless your engine is pushing out more than 85 + hp a 45 weber will simply overfuel the engine and wash your cylinders causing increased bore wear. The pics below shows how more efficient an "Inline" inlet manifold is compared to a single SU or Weber manifold. (the pics are of a single weber set up and a Split weber set up for comparison only)   |
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I'm sure someone else will be able to offer more detailed advice, but for looks alone I would go for twin carbs
Dec 2, 2015 15:29:34 GMT 1
Dec 2, 2015 15:29:34 GMT 1