[TR] TR3a vacuum line

[Randall]

> Its been too long since I had physics, but does the size of 
> the vacuum 
> line really matter once the vacuum is present?  Just a 
> curiosity question.

It could make a difference, in terms of how quickly the diaphragm moves
under changing conditions.  Some cars actually have deliberate restrictions
(although no Triumphs that I know of).

But in this case, the only concern is having the line mate with the
fittings.  Since a TR3A uses compression fittings at both ends of the vacuum
line, the OD of the line has to be within a fairly small range for the
compression ferrule to seal to it.

My recollection is that 1/8" copper works fine; but I also don't think the
fittings are metric.

Randall