RE: Heat crazed mad scientist

[John_Calabrese@ENGELHARD.COM]

In order to quantify the flow increase, and thus the talk of laminar vs
turbulent flow, a velocity must be calculated from the area, and cfm flow
of the engine at different speeds.  Once the velocity and reynolds number
is calcuated, then you can see whether or not turbulent or laminar flow is
present.  Either way, in a stock TPI throttle body, there is a abrupt edge
where the airfoil goes.  Any time there is an abrupt change in direction,
flow separation will occur, and it will occur easier at higher velocities.
Flow separation can be avoided or lessened by smoothing out the abrupt
changes in the device you are flowing air in, be it a manifold head port,
or a throttle body.  The airfoils' job is to fill in a dead spot between
the two openings, thus making the change in direction less abrupt.  This
should increase the flow due to the smaller amount of flow separation from
the side of the walls.  NASCAR guys do this to the inside of the intake,
trying to fill in dead spots in flow that could cause flow separation,
vortices, and reversion, all which adversly effect flow rates.  I do have
to disagree with grumpy on the fusalage being the same as the intake.
Inner flow and outer flow can differ significantly when boundaries and
finite areas are considered, plus everything on a plane is designed for
lift and minimal drag....




"Marteney, Steven J." <smarteney@xlvision.com>@diy-efi.org on 06/05/2000
09:31:58 AM

Please respond to gmecm@diy-efi.org

Sent by:  owner-gmecm@diy-efi.org


To:   gmecm@diy-efi.org
cc:
Subject:  RE: Heat crazed mad scientist


I don't have anything intelligent to add to this topic, but I find it
interesting that ALL (?) the aftermarket, high-flow, twin-blade throttle
bodies basically have the airfoil piece designed in the housing.  Do they
do
it for looks or just for show?

Steve

-----Original Message-----
From: Bruce Plecan [mailto:nacelp@bright.net]
Sent: Saturday, June 03, 2000 4:37 PM
To: gmecm@diy-efi.org
Subject: Re: Heat crazed mad scientist



Someone posted a link to a pic of one, after a quick refresher on what they
look like, I'll bet 2 shiny new pennies that it will slightly worsen the
air
flow, especially at higher flow rates.   For a better look at what happens,
you might try to get a copy of Model Rocketry by G Harry Stine.  Lots of
**Good** data about sub sonic air flow.  Also an easy read, and I think
there was some talk about laminar flow boundry layer etc...
   Also, for aero info., look at the WWII fighter stuff that's all sub
sonic
(prop stuff, in level flight), and a good source.  Exterior flow over a
fuselage is just the same as what's in the intake tract.
   If ya think I got crazy about air filtering, and misc stuff ya ought see
what rockets brought out in me
Grumpy
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