Heat crazed mad scientist

[Gabe]

Turbulance near the injector sounds good, but near the throttle body doesn't
sound that good to me...

Mike Rolica wrote:

> AHHHHHHHHHHHHHHHHHHHHHHHHHHHRRRRRRRRRRRGGGGGGGGGGG!!!!!
> I just finished school!!  Flash backs!!
>
> Sorry.....
> Yes but if you remember...... they are minor losses... not enough length or
> enogh of them to affect it....
> Also.. you  do want turbulence and seperation as it will help in mixing in
> the cylinder and a more complete burn!
> Ever seen a set of 94 fs chev truck heads???? If so you'll know what I
> mean... the have ramps... and make decent power..
> Mike Rolica
> Plant A,
> Magnesium Products Division
> Strathroy
>
> (519)-245-4040  Ext. 265
>
>                 -----Original Message-----
>                 From:   John_Calabrese at ENGELHARD.COM
> [SMTP:John_Calabrese at ENGELHARD.COM]
>                 Sent:   Monday, June 05, 2000 10:53 AM
>                 To:     gmecm at diy-efi.org
>                 Subject:        RE: Heat crazed mad scientist
>
>                 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 at xlvision.com>@diy-efi.org
> on 06/05/2000
>                 09:31:58 AM
>
>                 Please respond to gmecm at diy-efi.org
>
>                 Sent by:  owner-gmecm at diy-efi.org
>
>                 To:   gmecm at 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 at bright.net]
>                 Sent: Saturday, June 03, 2000 4:37 PM
>                 To: gmecm at 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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