First of all, sidedraft webers are as common as bellybuttons in racing
applications. Usually as one throat per cylinder. Downdraft
conversions are common for street cars because they are usually
designed for a single carb and it's a cheaper approach. A pair of side
draft webers and a manifold is a bunch of bucks.
The good news with Webers is that they are almost infinitely
adjustable. The bad news is that they are infinitely adjustable. If
you run webers for long you will become more expert on them that just
about any other part of your car, and you will have a vast collection
of little brass thingies that cost way too much money for each bit.
The choke size is adjustable so big is good--it lets you sleeve down
(or up) to the size you need. 45 mm (45DCOE) is very common but few
LBCs actually run that size, and you can generally tell which ones
they are by the huge stumble coming off the idle jet. The largest
venturi for a 45DCOE carb is 45mm, but in actual use most have choke
venturis that take them down to 38mm or so.
You can spend a lot of time working on your webers, and there's
horsepower hidden in all those parts, but it's a lot easier to set up
a set of SU's. But I'll take Webers any day.
On Oct 30, 2008, at 11:59 AM, George Harmuth wrote:
> I have a carb question, I was just offered a Weber side draft carb,
> I don't
> know the number off hand, for my 72 street Spitfire. I see lots of
> conversions to a Weber downdraft carb but very few for the sidedraft
> type.
> In theory, a sidedraft seems like a more efficient flow into the
> engine, no
> right angle turns. Is there some reason weber sidedrafts aren't that
> common? Am I better replacing the single Stromberg with a spare pair
> of SUs
> from my racing spit or the sidedraft Weber? Are there clearance or
> mounting issues with the Weber?
>
> thanks
> mike
>
> G. Michael Harmuth
> Software Engineer
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Bill Babcock
Babcock & Jenkins
Billb@bnj.com
503.936.7660
www.bnj.com
Editor
Ke Nalu e-Magazine
Paddlesurfing's Web Journal
Bill@kenalu.com
www.kenalu.com
blog: www.ponohouse.com/ponoblog
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