[DeTomaso] Ram-air Scoop

Sat Apr 2 22:42:17 EDT 2011

i am far from a math whiz, but i do have decent recall and I remember some
NHRA trivia from a broadcast a couple of years ago.
Both top fuel rails and funny cars are restricted in the size of the blower
scoop opening to 63 sq in.   They make 6-8,000 horsepower (although using a
massive blower ).

just for what it's worth.

I'd be curious as to the size of the roof scoop on the old McLaren F1
supercar built in the 90's.

Michael Shortt
 On Apr 2, 2011 10:21 PM, "Will Demelo" <wdemelo at cogeco.ca> wrote:
> Sooo....Too small?
> Will
>
> -----Original Message-----
> From: Tomas Gunnarsson
> Sent: Saturday, April 02, 2011 7:23 PM
> To: Will Demelo ; Detomaso at realbig.com
> Subject: RE: [DeTomaso] Ram-air Scoop
>
> A 6 liter engine at 6 krpm and 100% VE moves 300 l/s. A duct area of 150
cm2
> (24si is 155 cm2) gives an air speed of 20 m/s or 45 mph which isn't that
> much IMO.
>
> Tomas
>
> -----Original Message-----
> From: Will Demelo [mailto:wdemelo at cogeco.ca]
> Sent: den 2 april 2011 22:49
> To: Tomas Gunnarsson; Mike Thomas; Detomaso at realbig.com
> Subject: Re: [DeTomaso] Ram-air Scoop
>
>
> I wanted the scoop to be as small as possible and not look obtrusive. I
> wanted it to follow the roof line and look "right".
> I used the calculation of a carb opening (5.125" D) to calculate the
> required opening which is 20.57 "sq. My opening is 24.45"sq. So I'm hoping
> there's no restriction.
> Air speed at opening? Not a clue.
> Dan Jones said rule of thumb is 1% gain in torque for every 10* lower air
> inlet temp. Goram recorded substantially lower temps at 50+mph. Not much
of
> a difference at lower speeds.
> Will
>
> -----Original Message-----
> From: Tomas Gunnarsson
> Sent: Saturday, April 02, 2011 4:02 PM
> To: Will Demelo ; Mike Thomas ; Detomaso at realbig.com
> Subject: RE: [DeTomaso] Ram-air Scoop
>
> As long as the scoop is sealed to the air box you should achieve the
desired
> result. How does the inlet opening area compare to the inlet area of the
> throttle bodies? Perhaps more interesting, what air speed do you get
through
> the opening at max rpm and 100% VE.
>
> Tomas
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of Will Demelo
> Sent: den 2 april 2011 11:15
> To: Mike Thomas; Detomaso at realbig.com
> Subject: Re: [DeTomaso] Ram-air Scoop
>
>
> I don't think it will. I should've called it a Cold-air scoop. That;s
really
> what I'm after. There is a new Ferrari(?) that has a new ramair inlet and
> apparently, it gets an extra 7hp at 150mph+.
> My laptop was reading 180* air intake temps on a 75* day. I'm hoping this
> brings the temp down which should help performance a tad.
> Will
>
> -----Original Message-----
> From: Mike Thomas
> Sent: Saturday, April 02, 2011 1:21 AM
> To: 'Will Demelo' ; Detomaso at realbig.com
> Subject: RE: [DeTomaso] Ram-air Scoop
>
> Great concept molding it into a sugar scoop spoiler, but I wonder if it's
> going to have enough rise to get out of the boundary layer over the top of
> the car.
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
On
> Behalf Of Will Demelo
> Sent: Friday, April 01, 2011 5:30 PM
> To: Detomaso at realbig.com
> Subject: [DeTomaso] Ram-air Scoop
>
> Hope this works..
> http://s267.photobucket.com/albums/ii313/4nhotrod/
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