[Mgs] dropping RPM's

[Paul Hunt]

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?