[DeTomaso] Engine Bay Air Flow

[GW]

I have been interested in airflows in several respects. I have made 
enough changes to my car I don't really pay a whole lot of attention to 
what the current belief is. I prefer to find out for my self and 
understand what effects certain changes have on things.

One thing I have done with my car (still under construction) is duct all 
air out the hood and I have made a removable belly pan. There are some 
other differences as well so what I eventually find on my car may not be 
the same as a stock car.

I would like to gather data and not just a picture of some strings. I 
wrote some software and made some circuits to read and data log engine 
parameters; O2, EGT, rpm, timing, etc.

http://www.rc-tech.net/cars/ts/d2.jpg

This is easily adaptable to many things. One sensor to play with is a 
pressure sensor to measure pressure on the car surface and to balance 
carbs. Another sensor would be air flow. I would also like to attach 
pots to suspension a-arms to measure compression at speed to measure 
effects of down force.

At some point I would want to reference all this to a stock car as well 
with and with out the tub. Evidently there is quite a bit of difference 
with the tub in and out.


Gary












Mark McWhinney wrote:
> Rumor has it that air flow into the engine bay via the AC vent as
> certain speeds, but as far as I know air always flows out of the opening
> above the decklid.
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
> On Behalf Of Will Demelo
> Sent: Monday, August 24, 2009 12:58 PM
> To: detomaso at realbig.com
> Subject: [DeTomaso] Engine Bay Air Flow
>
> Yesterday, I taped some light string to my rear deck lid and went for a
> ride. I was told by a few people (including Wilkinson) that the air
> flow, at higher speeds, flows into the rear opening. This was not the
> case. At least until 80 MPH. The air flows up from the engine, out the
> decklid opening.
> I kept track of air intake temperatures as I drove. At idle, the temp
> was 184 degrees. At 60 mph, the air intake temp was 174 deg. The outdoor
> temp was roughly 80 deg.
> I need to get the cooler air into  the motor. There is roughly, a 1% hp
> gain for every 10 deg cooler air. That's free hp.
> Will
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