Weber Carburettor

[Michael D. Porter]

M HILL wrote:
> 
> I am looking at making some throttle bodies to fit onto a twin choke  weber inlet
> manifold.  Unfortunately I don't have the manifold yet and was
> wondering if anybody would have the dimensions for the studs and inlet
> port spacings so that I can get started on the throttle bodies.
> 

Martin, these dimensions can be found in almost any Weber technical
guide (reprinted from Messrs. Weber).  Haynes has a guide which includes
this flange drawing for DCOEs (I assume that's what you're looking for),
as does one or possibly both volumes of John Passini's books on Webers
(the first book is on theory, the second is on tuning).  As I recall,
flange dimensions are the same for all the DCOEs, as are bore centers. 
The Haynes book is #393, and roughly, bore centers are 90mm apart, stud
hole diameters are 8.5mm, studs are 72mm apart on a skewed 16mm axis to
the bore centers.  Radii outboard of the stud centers is 11mm.   

However, I'm curious--are you doing this as a project for school, and
have the machining capability at the school?  Otherwise, throttle bodies
made to mate to a DCOE manifold are commonly available both here in the
US and in England (although they are a bit pricey!).  If for a
carburetor flange other than DCOE, I'd try the Passini theory book (vol.
1) first.
Cheers.   

-- 
My other Triumph doesn't run, either....