Rick,
Try 1/8" increments above 1", e.g., HS4=1" + 4*1/8 = 1"+1/2"=1.5",
HS8=1+8/8=2".
Bud
"R. O. Lindsay" wrote:
> This discussion brings up a question about naming conventions.
>
> My '63 E-type used HS8 carbs -- three of them. As they
> are 2" carbs, I assumed that the identification '8' referred to
> something logical like eight quarter-inch increments as in
> 8/4" = 2", or similar logic. However, now I don't think that it
> is that straight forward because the HS4 is a 1.5" throat carb
> and the HS2 is a 1" throat carb. Is there any logic in this or
> are the numbers just a progression as the throats get larger?
> On the Italian car, the 40DCNF refers to 40mm venturi,
> 'D'own draught, 'CN' style carburetor fitted to a 'F'errari.
> Perhaps I am just trying to read too much logic into the SU
> device naming?
>
> rick
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