I had a diagram relating to this in an old Mini tuning book so I've scanned
it and uploaded it....
http://www.ratdat.com/ram1.jpg
It shows the relative designs of horn and their effect on flow.
Eddie Rattley
www.ratdat.com
1969 - Datsun 2000
1969 - Datsun 1600
> I like the idea of simple dryer hardware for prototype cold airbox, but
> don't plumb the dryer hose directly to the air horns. Ya have to have a
> 'plenum', (aka chamber) for correct air flow. The reason that hi-perf air
> horns have full radii (greatly adding manuf complexity) is that they draw
> from all around, including 'behind' the horn. I have watched the flow
> benching of non-full-radiused and full radiused air horns, and the
> difference in surrounding turbulence is dramatic. We played with some
yard
> letting it crawl across the bench and into the horn, and the patterns were
> quite illustrative of things not anticipated.
> Fergus O
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