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Old 10-13-2007, 10:35 PM   #1
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Default Functional? ram air hood

I know its been debted a bunch of times if this is nesesary of eaven good for performance, but it still belongs here. I think.

can you see my hand?
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& this is the under the hood view. a fiberglass box will be fabricated, that goes over that hole. when closed it will atach to another pice that will have the filter, will be conected to the intake
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Old 10-13-2007, 10:40 PM   #2
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oh, & this are the grilles, so that no leaf will go in.
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the first one is the original that was on on the Trans Am. the second and third are the ones I got done in a shop here in PR. they are a little smaller since the first one didnt fit.
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Old 10-13-2007, 10:43 PM   #3
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You got balls Alex, cutting into that hood.

Letting the cool air in is important but even more important is letting the warm air out.
How are you going to accomplish this.

Looks real good though. I like the look.
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Old 10-13-2007, 10:43 PM   #4
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Ram-Air hoods are effective above 120mph.......how is this cooler air being directed to the intake? You need to take more pics to show us how it'* routed.
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Old 10-13-2007, 10:49 PM   #5
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I know is not gona give me extra horses. but it works. the air that goes in trough the grills has nowhere to go but the hole in the bottom. Its been sealed. I guess the pic dosnt show how it is done very well, but I will take a better pic tomorow.
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Old 10-13-2007, 10:49 PM   #6
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Quote:
Originally Posted by willwren
Ram-Air hoods are effective above 120mph.......how is this cooler air being directed to the intake? You need to take more pics to show us how it'* routed.
show me proof that there only good above 120....

or are you just talking about the "forcing of air"
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Old 10-13-2007, 10:54 PM   #7
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look, Im not looking for controversy here. I was not looking for 10 extra horses or nothing like that. when its done, it will work as good as any other intake. if I get some performance out of it good, if I dont. who cares. at least it looks cool.
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Old 10-13-2007, 10:57 PM   #8
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Ram Air Myth: (try google for more info)

http://www.ls1tech.com/forums/showthread.php?t=148399


Alex, three good rules to follow:

1. Front to back. (flow direction) also ties in to #3.
2. Bottom to top. Convection. Heat rises.
3. What comes in must come out. Provide an inlet? Provide an outlet.
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Old 10-13-2007, 10:59 PM   #9
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I give you kudos for what you have done Alex.

Good job.

It looks great even though it'* not perfect as far as a true ram air set up.

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Old 10-14-2007, 03:16 PM   #10
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Quote:
Originally Posted by willwren
Ram Air Myth: (try google for more info)

http://www.ls1tech.com/forums/showthread.php?t=148399


Alex, three good rules to follow:

1. Front to back. (flow direction) also ties in to #3.
2. Bottom to top. Convection. Heat rises.
3. What comes in must come out. Provide an inlet? Provide an outlet.
To add to this:
Ram air has been used in piston driven aircraft. Mooney aircraft developed their 'Executive' into the '201'. This was a 20 mph increase in speed without adding a bigger engine. Ram air was used as one of the things that made a difference.

The link that willwren provides, gives us a key to what is really happening in that case too. Although the airplane is going 200 mph, the actual "ram air" affect is negligible. The ducting provided by the ram air intake is shorter, straight, and therefore more efficient than the other. It is these ducting losses (or lack thereof) that allowed for the increase in manifold pressure from 29.5" to 30".

The dynamic pressure of a fluid changes by the SQUARE of its velocity, so at 200 mph it is four times what it is at 100 mph. Since our cars barely get to 100 mph and the effect of ram air at 200 mph is negligible, ram air in our cars is even more negligible, so effectively doesn't exist.

The link above is inaccurate in its explanation where it mentions compressibility since technically, ram air isn't compressing the fluid, it is about RECOVERING the dynamic pressure that is already there. None the less, the effect is the same - NO RAM AIR.

The three rules are brief and may be a little ambiguous; the "front to back" rule will cause the ducting to be as simple as possible, the "what goes in must come out" is also about the ducting.

The biggest key in all of this is to do whatever you can to avoid unnecessary complication in the duct. You want to get as much of the atmospheric pressure as possible.
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