IMHO HIFs are more tricky to maintain as the carb has to be removed to
maintain the float valve and jet, and the float chamber cover seal is
perpetually in petrol and hence can leak. I've no idea on relative
performance, but I suspect some of the reason for the differences to the HS
is emissions related, so may affect performance adversely. I think all HIFs
had those throttle butterfly poppet valves, which frequently cause problems
with idle speed and certainly put a great lump of metal right in the air
flow. I have two of each.
PaulH.
-----Original Message-----
From: Erich <erich@mail.NGBM.COM>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: 31 October 1999 21:38
Subject: HS4's vs. HIF's for RB
>Hello all,
>
> I am looking at converting my 1980 RB to dual SU's. Does anyone know what
the differences are between HS4 and HIF carbs? Are there any pro's or con's
for the use of either in an RB conversion?
>
>Thanks,
>
> Erich - 1980 MGB (Brooklands Green)
>
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