For 2 more cents, how about a comment about HS4's compared with HIF's?
Bill
At 11:48 AM 05/31/2000 -0700, you wrote:
>My 2¢...
>
>Twin HS4 SUs are well proven in this application, provide good
>performance and good response, and all parts are available. The setup and
>maintenance are also well documented in the various manuals for the
>earlier cars. If you buy new you won't have to deal with most of the
>common problems involving wear.
>
>Larger than stock SUs (HS6) are probably not very helpful on an
>unmodified engine.
>
>The Weber DGV downdraft is a common modification, but is not any more
>potent performance-wise than twin SUs. They are pretty trouble-free once
>set up properly, but you won't find any info about setting it up or
>power- or emissions- tuning it in your MG manuals. The Weber manual won't
>have any MG-specific info, either. You may gather that I am warning you
>that you may be at the mercy of an "expert". But then again, it may work
>fine just out of the box. My indirect experience is with a friend's
>Sunbeam Alpine. The DGV fit right in, but he had to fabricate a throttle
>linkage. It was perfectly reliable, but he was never able to tune it to
>get rid of a "flat spot" in acceleration.
>
>FWIW (I admit I'm predjudiced in favor of SUs -- they just look right).
>
>David G.Butcher had this to say:
>
> >Hi all.
> >I'd like to replace my stock ZS carb to improve power, reliability, fuel
> >economy and emissions (why not ask for everything?). My car is a daily
> >driver and I need to pass our local air emission test when all is said and
> >done.
> >So far I've heard everything -- twin HS4's, twin HS6's, single Weber
> >downdraft. I think the only consensus at this point is the dual Weber
> >sidedraft conversion wil probably not allow me to pass emissions, so I've
> >ruled that out.
> >I don't have first hand experience with any of these configurations. Any
> >insight, advice, comments will be very appreciated.
> >Thanks,
> >Dave
> >1979 MGB
> >
>
>
>--
>
>Max Heim
>'66 MGB GHN3L76149
>If you're near Mountain View, CA,
>it's the red one with the silver bootlid.
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