Heat crazed mad scientist
Bruce Plecan
nacelp at bright.net
Mon Jun 5 16:31:20 GMT 2000
> There is a machinist here(the best in town) that does something to carbs.
He
> won't tell you what and during tech tear down it is invisible(it is
illegal
> in roundy round racin')but it makes a big differance. Has something to do
> with smoothing the surfaces, thats all he will tell you.
> "if ya ain't cheatin', ya ain't tryin'"
Invisible but illegal, ok now that makes no sense to me.
You wouldn't beleive how many folks think they are carb pros, but don't have
a clue. Depending on class, there are a ton of tuning areas that can be
tampered with, that alot of folks don't take the time to optimize. So when
they send them to someone that does all of a sudden it is better, is that a
real surprise?.
Heck ya gotta tell the customer something, and if you do give away all
your secrets, then your out all your R+D time
Grumpy
> Point is these are all hi-revin' race cars and I don't think the same
> treatment would be that noticeable on a stock engine under street drivin'
> conditions.
>
> Btw the same guy builds remote control cars that run 60+ miles per hour
> using weed eater engines. He wins every race without fail!
>
> Kelly
>
>
>
>
> >From: Gabe <gellett at earthlink.net>
> >Reply-To: gmecm at diy-efi.org
> >To: gmecm at diy-efi.org
> >Subject: Re: Heat crazed mad scientist
> >Date: Mon, 05 Jun 2000 10:32:54 -0500
> >
> >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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