>>> Bruce Durgin writes:
>>>
>>> I need to replace my original HS 4 carbs on my 64 B.
>>> Considering going with the HS 6 carbs to squeeze a better
>>> curve out of the engine.
>>>
>>> Has anyone tried this and was it worth it? Specifically,
>>> about $300 more than a pair of HS 4's.
>>
>> Larry Unger writes:
>>
>> IMHO ... no ... unless you have made substantial engine mods
>> you won't benefit from fitting either HS6s or a Weber ... let the
>> flames begin ...;^)
> Todd Mullins writes:
>
> Well, my understanding is that you only need bigger carbs if you're
> flowing more air, and you're only flowing more air if you
>
> a) run at high (>6k?) revs a lot, or
> b) have significantly increased displacement (2 liter conversion), or
> c) both
>
> Running a carb with too large a cfm rating will, at best, not increase
> performance at all, and, at worst, hurt performance by slowing down the
> intake charge. For normal street 'Bs, which I'm willing to bet rarely
> see the high side of 5k rpm, the HS4/HIF4 keeps the intake charge
> velocity high, which helps low-rpm cylinder filling and makes more
> power at streetable rpms.
>
Exactly ... ;^)
With a few mods, to increase flow, and a richer set of needles the HS4s
can be used on a "big bore - fast road" engine.
Safety Fast! ... larry.g.unger@lmco.com
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