functional hood scoop/ram air

Look up Bernoulli principle

 

on another note a forward facing snorkel does boost power and economy. being it is in a higher pressure and volume of cooler air... snorkel mod> than functional hood scoop

 

Since this thread has popped back up i'll add my recent thought on the subject.

the air intake Pulls air in quite a bit, it doesn't just receive air, you know what i mean?
so rather than pulling warm air from a stale spot in the engine bay it can pull cooler air from outside, even though it's low pressure area, it might be able to pull enough air to make it work. so I say give it a shot!

 

this is exactly right. makes the hood actually a vacuum. there is actually an absense of air here. might actually make the engine fight harder for air.

 

IIRC Factory intake comes from the wheel well - I don't know what the pressure or temperature is in a dynamic state.

Front bulkhead by radiator would be a good place if it wasn't so suseptible to causing a good hydrolock if you have a good water crossing.

 

ahh your right, I don't know what i was thinking there.

 

It's all good!

 

Thanks for the schooling . I was wondering how I could test or measure the air flow was in that area. Although the scoops on the cars where not always much bigger than the truck.

But, I still don't get how hig velocity == low pressure. I understand how lift works for a plane's wing in that one side has low pressure and the other high thus producing lift (at least that is what I remember) but the velocity is the same on both sides - I guess until you interrupt it with a flap.

We should probably have a sticky for Taco noobs like me to forget about a functional scoop.

 

It's not high and low pressure....It's highER and lowER. The difference between the sides of the wing are based on the camber of the wing. And the velocity is not the same across both the top and bottom of the wing. The more camber the wing has, the larger the difference in speed is. If two molecules are next to each other and one goes over and one goes under...They will meet up at the back of the wing again- but the one going over the top will have to go faster to get there at the same time....creating the low pressure vacuum that pulls the wing.

When you are talking about moving air over an object- When the molecules move fast they don't have the change to exert as much pressure on the surface...so it's low pressure. At the nose of the truck- The air hits flat and "stagnates" causing a small high pressure, low velocity bubble...Once that bubble forms, higher velocity air moves around it and creates the laminar flow along the shape of the car leading to high velocity, low pressure air and eddies (like over the back of the cab and the bed...)

 

URD TCAI if no water forging is on your future

 

Thanks for taking the time to go over that! When I saw your avatar I thought oh yeah he can school me It is times like these that I love the internet.

So, what is low pressure is not the air that is flowing at high velocity, but the area under that high flowing air. Correct? And what you say about the front makes sense as that is where my cars CAI get it air or from the air dam underneath in front. And drag race cars that use a scoop at mid hood have them very high.

Great stuff. So, lesson is that regardless if the scoop can be made functional there is not the proper flow to get a ram air benefit.

 

My version of Ram Air.

 

ZOMG awesome!

 

see, something like this i can see working ok. it gets all the air from the fenderwell, along with the extra being forced through the ducting at the front grill, any hp increase nticed?

 

I can not say it created any additional HP, but my inlet temps did go down.

 

Possible problem with this setup is that you may not actually get any "ram air" benefits. Conceivably, if the air pressure coming in thru the grill intake is higher then the pressure in the wheel well, the air will flow thru the airbox and out the wheel well. It would not pressurize the airbox. I can see this happening at highway speed, but without measuring pressure in both spots, only way to see if anything is happening is to plug up the wheel well intake and run it for awhile.

I see people adding air intakes to different spots on cars/trucks all the time. But if those intake spots have different pressures, you may be creating an air flow loop that is not intended.

The way you have it set up there shouldn't be any air starvation into the throttle body, since the grill intake is dumping air right onto the filter. I suspect though that you're not pressurizing the air box.

And before anyone jumps in here, I do realize "pressurize" is not a great term since you need to be doing about 90-100 mph before you get much pressure anyway. But I think it helps explain the concept.

 

Ya .... what he said.

 

Agreed. My pressurization happens a little farther downstream.

 

Ohhh, whoops

 

DO IT!!!! I'm thinking about making a ram air system using my turn signals as intakes.