Hi Skip,
Does seem like new/rebuilt carbs would be of benefit. Off the top of my
head I can only think of a couple of benefits with HIFs - they have a
temperature compensated jet should not suffer from being over-rich on
hot-starts, and there is a bypass port which prevents fuel pooling in the
throat on a long idle which can eventually cause the engine to stall. But
IMHO these are outweighed by the increased complexity, and having the float
chambers underneath and the cover seal submersed is a pain. That and the
accursed poppet valves in the butterflies, which is an emissions measure. I
also setting the fine mixture control with the lifting pin is much more
difficult on my HIFs than on my HSs, there is barely any difference in idle
as you raise the pin, but it is there.
PaulH.
----- Original Message -----
From: "Christian, Skip" <wellner.christian@navy.mil>
To: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>; "MG Digest (E-mail)"
<mgs@autox.team.net>
Sent: Thursday, April 08, 2004 4:42 PM
Subject: RE: Carb & Trans Oil Questions
I packed the ends of the carb throttle shafts with grease and the too fast
idle problem disappeared. I guess I need either new carbs or shafts and
bushings. I will probably junk the HIFs and install HS4s. The thing about
the SUs I like the most is their simplicity and the HS series work fine and
are the most basic. Unless someone can tell me why the HIFs are better (a
lot of people have told me to keep the HIFs, but no one has provided a good
reason), I plan to switch to HS-4s. Anyone - why are HIF4s better than HS4s
(not including emissions) ?????
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