Has anyone put a fiberglass functional ram air hood on there truck. Does the hp and tq put out better then the after market K&amp;N air filter kits. These hoods looks bad ace. There is 3 diffentstyles I was looking at.There is theRam Air Hoodfully functional by PowerHood and the Double Scoop 3 ram air hood non functional@<a href="http://www.ramai...irhood.com</a> Also was looking at theDetroit Shaker hoods@ www.carhoods.com give me your opinions on how the fit and if anyone knows how much difference there is on Ram Air vs K&amp;N

 

Might want to look here as well...

http://www.hambekcustoms.com/products.php

 

Anyone can correct me if I'm wrong here, but I believe ram air performs best when speeds are excessive. When just cruising around 55 or so, it's not doing much of anything for performance. I know on sportbikes, the ram performs best when over 100mph. That's when you see the best gains of it. Like I said, correct me if I'm wrong. A trucks ram air may perform a bit differently.

 

The purpose of ram air is not to stuff the truck full of air but to grab air from a cooler place than the engine bay. I would get whatever CAI you preffered then make a ram air system out of PVC that hooks up in front of the radiator or wherever. Just run a tube to the filter with a scoop on the other end so when your intake sucks it will suck in cold air from outside.

 

an old post:
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Heard of the 'Ram Air' effect where the speed of the air hitting the vehicle
builds up pressure in a forward facing air duct and helps 'supercharge' your
engine a bit. ?

Well, at 'typical' street speeds the effect is very very small.

The formula for that is:

Inches of water pressure from Ram Air = (mph) times (mph) divided by 2025.

So at 70 mph the ram air effect is:
(70 mph) times (70 mph) divided by 2025 = 2.4 inches of water.

So the very best possible air inlet tube designed for Ram Air would actually
have a positive pressure of 2.4 inches of water.

How much pressure is an inch of water ?

One psi of pressure is equal to about 28 inches of water.

You can get this by dividing the cubic inches in one cubic foot ( 12 x 12 x
12 ) by the weight of one cubic foot of water ( 62.4 lbs).

The air pressure around us is averages about 14.5 psi at typical heights above
sea level.

So another way of looking at it is that the air pressure around us is about
400 inches of water. ( 14.5 x 28).

So the best Ram Air system at 70 mph gives you a boost of about 2/400 or one
half of one percent. Small.

Ram air started in airplanes where it means more. An airplane going 300 mph
gets a boost of:

300 x 300 divided by 2025 = 44 inches

This is a percentage boost of 44/400 or about 11%

Want a challenge?
Consider your tires.
Some strange facts:
At 70 mph the center of your tire is moving 70 mph.
The bottom of your tire where it 'grabs' the pavement is moving at 0.1 mph
The top of your tire is moving forward at 140 mph.
If you could put a 'Ram Air' inlet right at the top of the tires (where it is
horribly dirty and wet) you could get a significant air pressure boost.....