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Old 05-05-2010, 10:45 AM   #21
CaysE
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This kind of shield isn't going to protect your filter from splashing... when you're driving, water is being thrown off the tires behind the front wheels, not in front. Unless you drive in reverse at 65mph.

The filter on a CAI gets wet from water entering from around the foglights and headlights in front, and from between the hood and fender from above. The only shield you really need is one like this that covers the top and front-facing surfaces of the filter: http://cgi.ebay.com/ebaymotors/ws/eB...m=130287318778

Hope this helps.
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Old 05-05-2010, 10:52 AM   #22
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that looks pretty cool and for the most part universal
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Old 05-10-2010, 01:41 AM   #23
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CaysE------
The next time you are driving in wet conditions, and see vehicles hitting pot holes (prominent in Michigan) look at where the water goes..., or any standing water of depth....
The water which can't go under the tire gets squeezed forward and up as well as to the sides... this is what I was afraid of....
As I stated prior, mist is fine.... what comes in from around headlights and like has no direct path, and will not be in significant quantities..., further more the Cai is under the steel inner fender. The only circumstances I could imagine for you to drive through that would get around the shield I built is either driving through water higher than the lower edge of the lower grill, or a wall of water @ speed (like driving into a water fall). Either of which is inadvisable when using a Cai.

Also for those concerned about mist and water coming from driving down the road (when stock or with a shield like mine), remember, all first gen stock airboxes have a duct that directs air on the filter from a scoop on top of the tax support which takes air that squeezes between the upper grille, and hood. And yet those don't seize or break during standard driving.
Please note also RAM air vehicles, with a small hole or gap to drain water (and deflector to prevent directing water into the filter), have lived long and strong lives driving in all standard driving conditions. However they are designed to take air through the hood or grille, so they don't worry about puddles and like to push gobs of water through the filter....
As for the shield in your link, it was engineered as a heat shield, like if you need to install in proximity to say... the exhaust. It may work for you, but I won't bet on it.

Maybe I built mine too strong, but i'd rather be over protected..., even @ a reduction of gained performance.

All statements based on first gen us focus design....
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Old 05-10-2010, 01:52 AM   #24
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Above I wrote tax support, I meant rad support. I am using a Android phone to write these lately, and the word listings it includes aren't really complete, especially involving auto terms. And also messes up key entry here and there. And random punctuation.
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Old 05-10-2010, 09:09 AM   #25
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I understand what you're saying, but I think an objective look at your filter even with this shield installed during heavy rain will reveal that it is indeed still getting very wet. Maybe the major difference here is the SVT foglights vs. standard Focus foglights, but on my car (SVT) I did have a plexiglass shield covering the same area with an AEM CAI installed, and the filter still got wet during heavy rain. There is definitely a significant enough amount of water coming off that driverside foglight and from above that the shield I posted above is necessary. If hitting standing water causes splashing, then perhaps both pieces are necessary. In my opinion though, something that covers just the filter itself would be more practical than a full undertray, since you need to install a shield around the filter anyway.

This was my setup... the hole was originally used with an airbox scoop from a standard Zetec, but I covered it over. It didn't make any difference in how wet my filter got.
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Old 05-17-2010, 12:54 AM   #26
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A wet filter is going to happen when driving in misty conditions regardless of shields, unless you are pulling cabin air.
Even a stock filter likely will get damp.
I have no foglights (yet), but other than that, it is basically the same for all first gen.
Your plexi shield is essentially the same as what I built. Except my car didn't come with the plastic panel behind the bumper, so my panels are engineered to cover that purpose too.

As I stated prior, a little water is fine, just a little....

When you go cold air, you take risks.

I built my shield to prevent CATASTROPHIC failure from regular road conditions, with reasonable driving practices, without too much performance degradation from non-protected gains from the Cai.

I admit to not looking to test with standing water, but I've been driving with this shield for nearly a year, and I haven't seen a issue yet....
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Old 05-17-2010, 01:34 AM   #27
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what about an air filter cover http://www.ajusa.com/details/index/0/0/0/AIR%20799-456 or the fact that k&n air filters are oiled and oil make the filter water resistant
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Old 11-03-2011, 02:12 PM   #28
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Firelink
Sorry, haven't been on in a while. Your link is for a prefilter for lack of better description....
Just like k&n, I am using a reusable oiled filter.
While it would have some effect, it is not going to be much....
The oil catches particulates, and repels water, but a filter is pourus, and the flow rates and filtering is targeted at debris, not cascades of pressurized water.

All.
I never did get around to securing the shield to the bumper, I have done 90+, and still no rattling.....

Good luck, gotta get to work....
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Old 07-07-2013, 04:03 AM   #29
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Further update, in case someone stumbles upon this thread....
It is now July 2013.
I never did get around to securing the front edge of the shielding to the bumper.... When I have looked under the car for other repairs, there was nothing that caught my eye, there is no rattling, and it has not worn through the bumper. I have driven through snow year after year (including some that was a little above the bottom of the bumper), driven in excess of 100 MPH, basically forgotten all about the shielding and it has given no issues, never been bent, never come off....
I don't have to worry about babying it to get through puddles, and no I have not hit anything with it (once I might have barely scrapped the lower edge of the bumper on a curb).
In short, I'm more than satisfied with the creation, it has supported the bumper, helped with cooling, and protected my motor against accidental water feeding....
I don't know what more to say on this one other than it worked, and still works....
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Old 07-09-2013, 06:53 PM   #30
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Nice. What size of a sheet did you use and what thickness/gauge. Been thinking about doing something similar myself.
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