An unanticipated side effect of Cd reduction

[Silveredwings]

[hypermiler01]

Originally Posted by basjoos

Right now I'm thinking about some sort of 2" diameter flexible duct running through the engine bay from the grill inlet to the vent air inlet plenum. That would be taking air from the one high pressure region remaining in my car's aerodynamics and any water sucked in would be dumped into the inlet plenum that is already designed to separate water from the incoming.air flow. There would be a slight drag increase, but it should be very minimal.

Sounds like the best idea to me, but I'd use 3".

[NiHaoMike]

Use a computer-type fan. It would use very little power.

[skyl4rk]

What is the proper name for a "valve" that would allow an air inlet to be turned on or off?

I am thinking of adding a naca duct with some type of valve that will close off entry of both water and air, and maybe design in some kind of water separation chamber. I have not had much luck with google trying to find examples.

air valve?

Here is an example of a water separation chamber, known in boating as a Dorade:

[hypermiler01]

Originally Posted by skyl4rk

Here is an example of a water separation chamber, known in boating as a Dorade:

All that is already designed into the factory intake.

[Allch Chcar]

Originally Posted by hypermiler01

All that is already designed into the factory intake.

Already recommended too. I checked my intake yesterday and the piping from my lower intake runs up to the airbox and a separate house runs into the exhaust. There is a simple one way limiting valve in the exhaust connector it's just wider on one side and smaller side to limit backflow. I know I have water leaking in my engine but it's not coming from my intake.

[ALS]

I installed a SNOW cover on my cowl intake and it dropped my air flow by at least 75%. Even though it looks like an air scoop it lies below the boundary layer thus no ram effect. Plus with the top completely covering the cowl intake the high pressure area at the base of the windshield is totally useless.

[lunarhighway]

i suppose it would work better if teh scoop was on the other way round

[DonR]

The one on my Jeep is turned around with the opening facing the windshield. Works wonders.
When it's turned around it works just like a cowl induction hood.

[Scheißeglück]

Originally Posted by DonR

The one on my Jeep is turned around with the opening facing the windshield. Works wonders.
When it's turned around it works just like a cowl induction hood.

I've been meaning to invest in an after market cover for the air induction vent on my Jeep for awhile now. Most owners of Jeeps in my area (and there are a ton of them) always face them with the cowl opening facing the away from the windshield, because they mostly drive at slower speeds, being city driving or off road. At slower speeds the air moves into the cowl by the movement forward, but at higher speeds the air will "dam" up the opening, just causing air to not enter the cowl as freely. For higher speeds, with a taller cowl cover facing the windshield, this is going to keep the air from damming the opening, and because the taller cowl is going to create turbulence, much like that of air passing over a car with a wide, blocky rear end. The air is going to want to do the same when it passes over the cowl, thus more willingly enter the air vent.

This is an after market one from Bushwacker for a YJ series Jeep Wrangler, but you get the general idea. These are super easy to make as well if you have a plan and know what to get from the hardware store.

Overall, I'de say depending on what driving you do most, depends on which way you want that opening of the cowl to face.