[DeTomaso] Ram-air Scoop

michael@michaelshortt.com michaelsavga at gmail.com
Sat Apr 2 23:01:53 EDT 2011


here's some interesting reading and a proper formula.

http://www.racecarbook.com/pdfs/16.pdf&source=android-home&ved=0CBMQFjAA&usg=AFQjCNHwwJli8c8fd5t4Gnp4RISrmEy8OQ

Michael Shortt
On Apr 2, 2011 10:42 PM, "michael at michaelshortt.com" <michaelsavga at gmail.com>
wrote:
> 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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