Boring out weber venturis

[haasad]

Has any got any experience of boring out weber venturis. Mine are 32 mm and I need 36's . It looks straight forward to me just to take 2 mm from all the internal features ?

andy

[stuby]

I would think the best man to speak to on that subject would be Alan Drayton

Stu

[911hillclimber]

I think the weber venturies are die cast so thin walls. You might break through when machining.

New billet ones are available in many dia's from PMO, about $100 + all the taxes etc. so about £100 the set.

[Alan @ CanfordClassics]

Hi Andy, we have machined them before so just give me/Stuart a call. Or we could just make some for you, no problem.

Alan

[haasad]

Ok, thanks since machining is an option I'll check wall thickness make a few calls and fire up the lathe....

[Rickard M]

I made a special turning tool which took the whole top side at a time, then I drove all 6 directly without touching the radial depth. Then I broke the new long straight through the old slope

[haasad]

Job done , found out that the castings are thicker the smaller the venturi. Simple to machine bore and then angle end of radius to 40 mm ID at bottom of venturi. I took a chance on a distinctly non standard 35 mm since by empirical evidence 36 is too big and 34 too small. Time will tell.

Andy