> 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
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