Michael- Quoting directly ( as I appear to have had a memory reversal on the
length/RPM issue),"Anything with a radius over about 1/8" is within a 99% chance
of working. Where a radius is not totally formed, i.e.it doesn't roll back
completely on itself, then so long as it turns out at least 60 degrees, it will
work." The example which Vizard tested out almost the best ( interms of flow
rate) has a 10 degree flair (per side-20 degree inclusive), with a 1/4"radius
turning back 270 degrees. I'm unsure as to the real effectual area which will
cause an impingement in flow, I'd guess that 2D is a bit extreme. I don't
believe that a filter will have much, if any, effect on HP output (I know I'll
hear about that statement-shields up). I do know that your engine will have a
longer, happier life if it doesn't ingest rubber pieces, gravel and the odd nut
that flies by. This, in turn, translates into more enjoyment of the racing,and
less futzing around in the paddock.
In regards to how much difference does it make on a Sprite, when you're
trying to race something that originally had 30 some horses, every little
percentage is a bonus. If using the right ram pipe on the carb will increase my
throughput by 5.8%, then it's 5.8% more than I'd have had otherwise
Mark Haynes
EeeMCee@cs.com wrote:
> In a message dated 05/25/2000 7:06:23 PM Pacific Daylight Time,
> Mark I think it was you that said:
> << the upshot of his flow bench work was that the radius at the
> > end is the greatest determining factor in flow rates, >>
> quoting David Vizard. Is this referring to the flare on the end of the
> velocity stack? I've seen those that just flare out perhaps 3/8" on each side
> and those that wrap clear around backward. Is there any significant
> difference in performance?
> I've also heard that one has to be sure that there is something like 2D of
> the stack in front of it also for proper flow. Am I correct that this should
> optimally be like a balloon at the end of the stack?
> Since the open pore sponge filters we're referring to tend to approach an
> open area (as opposed to the side of an air cleaner, etc.) is their
> deleterious effect significant if they impinge upon that balloon area?
> and lastly: how much effect does this REALLY have on a sprite, etc.??
>
> Michael Rogers
>
> 732512 MI/Jaguar Special
> Dolphin Porsche
> etc.
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