Howdy,
On Mon, 10 Mar 2003, Conrad wrote:
> I am converting a car (a lotus) from carbs to fuel injection. The
> throttle bodies I'm using have a slightly diffeerent bolt parttern to
> the carbs, such that there is enough 'meat' on the flanges, but the
> holes are too big and about half 'a hole' out, if you see what I mean.
>
> I'm thinking about filling the existing stud holes in the manifold with
> JB weld to effectively make flat undrilled flanges and then drilling and
> tapping that. This will mean the drill/tap will be working half in alloy
> and half in jb weld.
>
> The jb weld packet seems to suggest you can tap it - in reality does
> anyone know if this will work?
>
> Should I go for a course thread like UNC, or a finer one (metric or
> UNF)?
I'd be worried about the two materials having different heat expansion
characteristics and the JBWeld coming out. This happened with an intake
manifold I JB Welded a crack in once...
Is there a reason you're not just filling the holes with weld, then
grinding it flat and redrilling/tapping?
Mark
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