I have to agree with Paul on this. During the restoration of my 72B, I
used the HS instead of HIF carbs. It was mostly because of familiarity
that I did this as I have owned this set for about 25 years. However,
during the limited use of the HIFs, I was quite impressed with their
cold weather starting ability. That wasn't enough to overcome my
preference to be able to easily remove the float bowl lid (HSs) which to
me is an important and easy troubleshooting technique when I suspect
fuel delivery problems.
David Councill
67 BGT
72 B
-----Original Message-----
From: mgs-bounces+dcouncill=msubillings.edu@autox.team.net
[mailto:mgs-bounces+dcouncill=msubillings.edu@autox.team.net] On Behalf
Of Paul Hunt
Sent: Sunday, September 09, 2007 8:45 AM
To: SCOTT BONACKER; mgs@autox.team.net
Subject: Re: [Mgs] dropping RPM's
The only benefit of HIFs over HSs is they don't tend to 'bog down' if
left
idling for a long time like HSs can, and are slightly kinder to the
environment. Everything else is a negative, the biggest being the float
chambers being below the carbs so you almost always have to remove the
carbs
to do anything with the float and replace the O-ring seal every time. I
think you would have to pull a huge amount of G to get the benefit of
the
jets being in the middle of the float chamber instead of to one side
with
the theoretical risk of starvation. The 'enrichment device' is a
separate
valve which can get blocked, has O-ring seals which can leak, and you
can't
visually tell whether it is operating or not. The poppet valves in the
butterflies are a pain, although they can be soldered up easy enough or
replaced (not so easy).
PaulH.
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