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FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD 

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Sun Feb 22, 2009 4:56 pm 
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I don't think it was a fluke where Ford put the vents in the EBGT,XA/B after looking at your findings.
That Autospeed site is awesome as well.
Yeah with a complete belly pan the air can't get out.

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Sun Feb 22, 2009 5:03 pm 
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badcooky wrote:
I don't think it was a fluke where Ford put the vents in the EBGT,XA/B after looking at your findings.
No, it wasn't a fluke. Am a little perplexed as to the vents on the EF XR6's tho. They're in a position of good airflow for the purpose of venting, sure... But what do they actually vent? A small amount of air from above your airbox and a small amount of air from your radiator overflow? All that does is draw hot air towards those points meaning your airbox actually gets hotter at low speed. Never mind. Fords only go fast.
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Mon Feb 23, 2009 6:28 pm 
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Maybe the EF XR vents create a state where the hot gases escape under the car through a vacuum effect or the like.

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Mon Feb 23, 2009 6:35 pm 
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badcooky wrote:
Maybe the EF XR vents create a state where the hot gases escape under the car through a vacuum effect or the like.

Maybe, but doubt it as the position means air comes out the bonnet, not into the engine bay. Hmmm. Would have made perfect sense if they'd ducted them.

In the end of the day they will provide slightly cooler under bonnet temps, but possibly at the expense of a higher intake temp. Can only presume they expected people to get rid of the air box once it was out the showroom door and didn't have to worry about noise issues any more. ...
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Mon Feb 23, 2009 9:22 pm 
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In all your findings fiendy, would you be able to tell me if I added a BA Bulge, to an EF Mont front, and cut 2 chunks out of the rear of it, like this except on the back of the bulge, would it be effective do you think?

Note the bulge is just std, not with that crap tacked on to the back of it (but thats where the slots on the front would then go)

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Tue Feb 24, 2009 2:16 pm 
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Mate, I would suggest it will work fine... But just what do you want it to do? If you are putting a bulge on (which looks really cool on the EF Mont hood even if it doesn't do anything practical) then you're going to be changing the flows and pressures at the area in front of windscreen so my testing is not valid. I'd suggest that the shape and having a void between it and windshield would reduce the pressure at that point to an extent that air would be sucked out of engine bay slightly.
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Tue Feb 24, 2009 2:46 pm 
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I see. I would like it to draw some hot air out, and yeh I want the bulge because theyre sexy.
Does your bonnet have the rubber bit around the back of it in front of the windshield?

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Tue Feb 24, 2009 4:19 pm 
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krisisdog wrote:
I see. I would like it to draw some hot air out, and yeh I want the bulge because theyre sexy. Does your bonnet have the rubber bit around the back of it in front of the windshield?
It does. I am yet to be convinced that removing that seal is much good for anything. The pressure at that point is such that you may start drawing air into the bonnet through the vent and it just means that any oil etc inside the engine bay can spray up onto your screen if the opposite is true.

If you put the bulge over your "real" bonnet, you could then drill one inch or 25mm holes in your original bonnet with a hole saw or what have you. I'd personally, put heaps of holes on passenger side in front of throttle and all over the place on drivers. Drivers side wont be so efficient at getting rid of radiator waste, but will allow some heat off your extractors to escape.

I just melted a brake booster by the way...

Ahem.

According to the testing the pressure on the bottom of the window is far greater than the pressure inside the bonnet which means air should move from high pressure (outside) to low pressure (inside). Of course, this is what air would like to do. When traveling at 70km/h it may have trouble turning that corner and actually doing what the pressure suggest.

Will remove the rubber seal tomorrow, tape wool strands all over the place and go for a little drive.

Cheers.
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Tue Feb 24, 2009 5:25 pm 
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Yeh my bonnet was resprayed before I got the car, and I only noticed the other day it was different to my mates lol.

I was thinking of basically cutting away all bar the structural supports under the bulge.... dunno, will have to see how keen me panel beater is on doing it all.

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Wed Feb 25, 2009 1:52 am 
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I had kind of a hump related idea just before..

put a smallish slot hole on the front and bigger one on the back. You could hide one or both behind color coded grills.
Then duct it internally with thin rectangular duct so the inlet slot and outlet slots are sealed together and air can pass though without ever entering the engine bay.

Now about half way along that duct cut a slot into the bottom and put a 2 inch long piece of duct in a y shape angled forwards to the front of the car.

As air is rammed into the front slot by forward motion pressure, the widening of the duct to the rear slot drops the pressure a bit as it goes along but the air is still fairly moving along.

Then near the fork of the y just down from the straight though piece, a low pressure area is created that together with the fast movement of air though front slot and out the back would really suck the hot are out of the Engine bay like a high powered vacuum cleaner...

hope that makes sense.. wasn't really even actively thinking about it when it popped into my head.
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Wed Feb 25, 2009 6:49 am 
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Frankieh dude, you're a thinking man. That would work well. What is that effect called when you create suction at the long end of a T by running something (water, air, large volumes of candyfloss) through the top of the T?

Anyhoooo, I've now been looking at ducting from drivers side front air dam to the brake booster area to create a slightly higher pressure of cool air at the booster which would then chase the low presure hot air from the extractors out of the engine bay without putting more troublesome holes in the lid.
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Sun Mar 01, 2009 8:13 pm 
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its called the venturi effect mate...
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Sun Mar 01, 2009 11:22 pm 
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britishracinggreen wrote:
its called the venturi effect mate...

Too right, it is. I am re-inventing the wheel again?

Tell you what, some of those "Vortex Creators" could do some interesting things put into some choice places. Especially on a UTE!


(I say UTE mainly as the WAGONS aerodynamics are complete crap from passenger compartment back and therefore nothing is ever going to help us E series wagon owners enough to make it worthwhile.... Dammit!)
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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Mon Mar 02, 2009 10:42 am 
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sorry mate but this thread is the biggest wank ive read since ive been here..

 

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 Post subject: Re: FIENDISHLY SIMPLE AIR PRESSURES OVER AN EF FAIRMONT HOOD
Posted: Mon Mar 02, 2009 11:03 am 
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Anyone else give a flying f**k about this wanker stopping by all these threads simply to leave crap like that?

Learn to read and use what is in your head.

Until then, shut up or f**k off.
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