SU HS6s used a tube from the float bowl to the jet, eliminating both the
rubber float bowl bushings and the jet seals, and were fitted by the
factory to TR4As.
In addition to being lower maintenance, they flow better and are
shorter, leaving more room for performance air cleaners and intake
manifolds. The TR4A intake manifold was also improved.
The conversion is something of a pain, though, as the throttle and choke
linkages are different.
Randall
59 TR3A - with a pair of HS6s and a TR4A manifold sitting on the shelf
(no, they're not for sale)
erl@unix.mail.virginia.edu wrote:
>
> For what it's worth, the original SU's on Triumphs were always the type
> that had the fuel feed through the base of the float bowl into the
> housing that carried the jet. The float bowl was attached and sealed
> with rubber bushings. Earlier versions were sealed via a set of fiber
> and brass washers. The SU's in which the fuel went into the bottom of
> the jet via a small tube were used on Volvos and others. I don't
> believe they were ever fitted to any Triumphs. However they worked fine
> on Triumphs, and many folks would swap, because the chokes worked more
> easily, and it was less difficult to rebuild.
>
> Cheers.
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