Did your results differ significantly from Vizards published work? BTW, I
always thought that the different height stacks on the SBC injection were
to tune the ports slightly differently to get a wider powerband - am I out
to lunch?
Brian
Brian
At 01:45 PM 05/25/2000 -0400, Arthur Blackwell wrote:
>Gee, I guess all that work we did on stacks for the Hilborn Fuel Injection
>for the
>Offy & SBC doesn't mean anything.......;-).....
>
>Mark Haynes wrote:
>
> > Craig et al,
> > David Vizard did a fairly complete study on velocity stacks, as
> printed in
> > "Building BMC 'A'
> > Series Motors" and the upshot of his flow bench work was that the
> radius at the
> > end is the greatest determining factor in flow rates, not the length of
> the velo
> > stack. tThe length lends itself directly to the intake path length, which
> > affects the power at RPM only, NOT throughput (flow rate) . Per this
> treatise,
> > if your cam gives more horses at a higher RPM, you want a longer intake
> path,
> > and vice-versa.
> > Just my condensation. My .02?- go with a velo stack that fits
> without major
> > modification, and is as close as possible to your expected HP
> profile-You could
> > Dyno it of course.
> > Mark Haynes
> >
> > Kerry Seibert wrote:
> >
> > > GREG - try APT (Advanced Performance Technology) in Riverside, CA.
> > > www.aptfast.com They have all kinds of goodies that might help. I'm
> > > using their SU billet stub stacks on my 1 3/4" SUs and a K&N filter fits
> > > over the stack. Still fits under the bonnet of my Morgan.
> > >
> > > Craig Seibert 1968 Morgan +8 car no. 611 "Duff Morgan Racing"
> > >
> > > PS I've talked to a few people who say the "tall" velocity stacks
> (though
> > > they certainly look cool) are not as good as a good "stubby" stack as
> far as
> > > air flow and turbulence. APT seems to be one of them. I'm no expert nor
> > > engineer . .. . . . . just using what seems to work for me . . . . . .
> > >
> > > -----Original Message-----
> > > From: owner-vintage-race@autox.team.net
> > > [mailto:owner-vintage-race@autox.team.net]On Behalf Of
> > > Gregory_Schulz@mil-elect-tool.com
> > > Sent: Monday, May 22, 2000 4:13 PM
> > > To: vintage-race@autox.team.net
> > > Subject: Filters for velocity stacks
> > >
> > > A friend runs vel. stacks on twin SU's.
> > > He has round cylindrical "slip on" foam
> > > filters about 4 in. OD and approx. 6 in.
> > > in length. They are very low restriction
> > > but do manage to keep sand, stones, etc.
> > > out of the internals.
> > >
> > > It is of "one piece" construction, versus
> > > several pieces glued together. The filter
> > > shape is reinforced by large internal coil
> > > springs which capture the lip of the stack
> > > and holds the filter in position.
> > >
> > > They were on an ex-SCCA Sprite from Texas,
> > > I believe, and over time the source info
> > > has been lost.
> > >
> > > Does anyone know if something like this is
> > > still available somewhere?
> > >
> > > Thanks,
> > > Greg
> > > VSCDA #517 Sprite
> > > Cedarburg, WI
>
>--
>Art Blackwell
>Denver, CO
>
>" Even in the future nothing works " Dark Helmet " Spaceballs "
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