[DeTomaso] Possible Hood Vents

Mon Jun 29 19:17:51 EDT 2009

Just getting in on the debate on this one after 4 days laid up in a Ft McMurray AB hospital, so it's good to be thinking about something other than when the hell can I get out of here and why isn't it dark yet.

I'm planning on cutting louvres into a fiberglass decklid I have for my '74 to aid both aerodynamic stability and evacuate exhaust heat from 180 headers.

Talk to Larry Stock on belly pans, the one he is now sporting is a rubber unit that is attached to the chassis plus a-arms and flexible enough to 'give' with suspension movement. If you are this serious you are probably running some fairly stiff springs with minimal suspension travel anyway. Larry also now sports a shaped wing on the underside of his front airdam to create a low pressure zone and encourage radiator air down and under the car. Similar wings are place at the back edge of the drop floor pans. At the very rear he has a rear CF diffuser (and mold for reproductions if anyone is interested enough). The angle fiberglass channels he has running tha length of the main frame rails were dragging the ground at the Reno event (raising some questions from both track staff and other participants alike). Larry had to adjsut the ride heght up about an inch to compensate for either the additional downforce (either that or compensate for the weight he added).

Julian

> From: dfcex at pacbell.net
> To: hemipanter at hemipanter.se; detomaso at realbig.com
> Date: Mon, 29 Jun 2009 06:32:38 -0700
> Subject: Re: [DeTomaso] Possible Hood Vents
> 
> I suppose it could have been toe, except the car really stabilized after the 
> deck lid flew off.
> This was around 170 mph, so it wouldn't be noticed with regular highway 
> speeding.
> 
> Dan
> Dan F. Courtney
> 
> La Jolla, CA
> 
> (858) 551-5455 Phone
> (858) 551-5456 Fax
> ----- Original Message ----- 
> From: "Göran Malmberg" <hemipanter at hemipanter.se>
> To: "'Dan Courtney'" <dfcex at excaliburre.com>; <detomaso at realbig.com>
> Sent: Monday, June 29, 2009 5:21 AM
> Subject: SV: [DeTomaso] Possible Hood Vents
> 
> 
> Dan.
> 
> At front I have used bellypan myself, but the car is very low
> and has stiff springs. The height makes for return distance
> and the stiff springs for less travel. On the downside this
> limit wheel diameter size. But I functions very well for a flat
> only bellypan. I had the whole front A-arm over the pan.
> 
> The rear is worse. On the side off and aft of the gearbox we
> have the subframe that limit the possibility of a diffuser.
> The same goes for the rear A-arms that can not go much lower
> than parallel to ground or else the diffuser expansion will be
> future limited by the frame.
> 
> I think you may have a point in the rear stance at high speed
> as the hood come off. Despite the fact that most people talk
> about FRONT end lift. I could imagine some slight lift force at
> speed and a reduction in rear end grip is felt as instability.
> But it might have have been amplified in conjuction with other
> issues like rear toe.
> Goran
> 
> -----Ursprungligt meddelande-----
> Från: Dan Courtney [mailto:dfcex at pacbell.net]
> Skickat: den 29 juni 2009 12:59
> Till: Göran Malmberg; detomaso at realbig.com
> Ämne: Re: [DeTomaso] Possible Hood Vents
> 
> Goran,
> 
> Pretty incredible engineering, especially the wood model.
> Would you say a bellypan cannot be incorporated with stock A-arms?
> 
> Dan
> Dan F. Courtney
> 
> La Jolla, CA
> 
> (858) 551-5455 Phone
> (858) 551-5456 Fax
> ----- Original Message ----- 
> From: "Göran Malmberg" <hemipanter at hemipanter.se>
> To: "'Dan Courtney'" <dfcex at excaliburre.com>; <detomaso at realbig.com>
> Sent: Sunday, June 28, 2009 12:52 PM
> Subject: SV: [DeTomaso] Possible Hood Vents
> 
> 
> We have some lost hoods in Sweden to. But the hood does already have
> a big hole in it for the air to escape. I don't think more openings
> does a to big job in reducing rear lift at speed. It is more of a
> direction of vented air stream, if this for some reason is desired.
> 
> Check out my drawings on my site www.hemipanter.se klick A-arm geometry.
> I did made a drawing of a frame layout that will permit the use of a
> functional bellypan. The front and rear lower A-arm mounts are raised
> to give room for both front and rear diffuser. My front hood air outlet
> is handling ALL radiator air. So here a bellypan is Ok. But the front
> end is pretty low to allow for some return movement of the low A-.arms
> not to hit the bellypan. This limit front tire diameter to 600mm.
> Goran
> 
> -----Ursprungligt meddelande-----
> Från: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
> För Dan Courtney
> Skickat: den 28 juni 2009 20:38
> Till: detomaso at realbig.com
> Ämne: Re: [DeTomaso] Possible Hood Vents
> 
> I think the bigger aero problem is air coming under the car and lifting
> the rear deck lid.
> Both myself and Mad Dawg have lost rear deck lids at high speed.
> The Beast has the vents in it's fiberglass front hood.
> I'll soon be adding a front air dam, but I still think a belly pan or
> louvers in a (fiberglass) rear deck lid are required.
> 
> Dan
> Dan F. Courtney
> 
> La Jolla, CA
> 
> (858) 551-5455 Phone
> (858) 551-5456 Fax
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