polishing intake runners worthwhile? & bosch high psi/highvol. pump

[Rob O]

>From everything I have read, a slightly rough (finished with 80-120
grit) surface will provide the best flow. Too slick creates a thick
boundary layer, too rough and you get major turbulence. Either way you
lose potential flow

Rob_O 

akallotte at juno.com wrote:
> 
> I'm glad someone else backs up what we've seen on the flow bench.  Super
> polished parts lead to weird turbulence (backwards flowing boudry layers)
> and less flow.
> 
> On Mon, 14 May 2001 02:35:47 -0800 Ludis Langens <ludis at cruzers.com>
> writes:
> >
> > Books that I've read say that the turbulence _increases_ airflow -
> > something about a smooth surface causes lamular flow along the
> > surfaces
> > (with a dead spot in middle of the runner), while a rough surface
> > causes
> > the whole runner cross section to be used.
> >
> > --
> > Ludis Langens                               ludis (at) cruzers (dot)
> > com
> > Mac, Fiero, & engine controller goodies:
> > http://www.cruzers.com/~ludis/
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