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Old 11-29-2008, 11:47 PM
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Weber I. R. setup

Anybody have any experience on these? I was looking around on E-bone and run across these. Are they really worth the cost? Can they flow enuff for a healthy big block?

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Old 12-07-2008, 10:00 PM
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I've run Weber sidedrafts (DCOEs) on a 2 Litre Datsun, that was a pair of 42 mm jobs. Was looking into a set of DCOEs for a Toyota 20R, (2.2L) and even for a stock engine Weber recommends 45s.

The carbs meter by the intensity of the induction vacuum pulse of one cylinder, not the steady-state vacuum like on an engine where the carb is shared amongst many cylinders.

For a built big block with modern cam and head advancements they probably don't make them big enough to make the HP numbers you could get with a single 4 BBL and correct intake. The idle, low-end and midrange is supposed to be great though - if tuned properly. Very streetable.

I love the look though, can't be beat. If I could afford them (and fit them under the hood) I'd run 'em.

David Vizard talks about them in many of his books, that's something to chase.
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Old 12-07-2008, 10:50 PM
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If one is willing to do his homework on those they are good and very streetable..A lot of people over carb an engine anyway so i think a set of 48's woudl do it for most apps unless you are turning a big block up in the 8000 range and how often is that? Back inthe day they were the answer but now we have EFI..

I have tried most all of it and now do what is known to work..
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