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.
----- Original Message -----
> I bought a parts car to get the HIF4's and related parts off it and
> replace my single ZS. I already have the HS4's on another car, but thought
> the
> HIF4's would be better because of location of the float bowls and because
> they
> are a newer design.
>
> It sounds like you think the HS4's are better. What
> characteristics led to that decision?
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