6 replies to this topic

[Dusky]

Hi all,

Does it matter wich diameter of tube I use for my vacuum advance?
Cheers

[Gremlin]

What are you planning on using

[Dusky]

It has real wide tubing now, at the thickest it is like 4-7mm diameter

[dklawson]

Yes and no.  You don't want tubing with a tiny, microscopic bore as it will limit how fast the distributor can respond.  However, too large will just look silly.  The original tubing will be close to 1/8" (3mm) outside diameter and have a bore of about 2mm.  Your larger tubing will work... it will just look different and you are likely to need adapters to fit the carb and distributor.

[Dusky]

It is the bore diameter that is 4-7 mm thick, so that would be good (eccept it looks silly)?

[Gremlin]

Yeah, you'll have to devise a method of sealing it at either end, when you say a bore thickness of 4-7mm, do you mean the ID is 4mm and the OD is 7mm?

[Dusky]

Yeah,internal diameter is actually around 5-6mm(measured it now), external diameter is around 9-10mm (measured also now)
cheers