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Old 04-23-2010, 07:53 AM   #1
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CAI and engine, longterm

I know we go over this all the time but here me out for a minute.

When I first bought my jeep I didn't know better and went and bought an Airaid CAI. Soon found out that it sucks up water and mud like it was born to do so. I put on a dust cover over the filter which works awesome, water beads up on it and mud sticks to it but nothing get through to the filter, I check all the time the filter stays clean and dry and so does the tube.

I recently got my hands on a stock air box for free (sold mine when I put in the CAI) I'm thinking about my engine in the long term, not gas mileage (which I noticed no improvement anyway from stock to CAI) or a stupid whistle noise. Honestly, does the stock air box really filter THAT much better than the aftermarket oiled filters? The stock air box just seems so restrictive to me even though everyone says its not. I'm debating weather or not to pull the CAI today and put back in the stock box with a paper filter. The pre- filter/dust cover does a great job of keeping out water and mud so my only concern and reason for possibly switching back to stock is the long term damage from particles. Are CAI's really like Jerry says nothing more than a screen door keeping out sand, silica and particles?

The stock box has a K&N in it now but If I do go back to it I'm going to put a paper filter in it, any suggestions? I appreciate the input guys.

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Old 04-23-2010, 08:45 AM   #2
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Simply put, there have been numerous tests that have showed the oiled cotton's inability to filter fine particulate matter.

If you talk to some of the oil analysis labs, they can identify who uses a typical oiled cotton filter and who uses a paper filter....due to the Silica content in the oil IIRC.

Personally I use an Amsoil EA filter in my Jeep. I have faith in its ability to filter, and I don't have to replace it quite as often as a paper filter....

AC Delco makes a fantastic filter, it was the only filter we'd use whenever a customer had us replace one (I was a suspension mechanic back in the day, but at times we'd do other jobs for customers).

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Old 04-23-2010, 08:48 AM   #3
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Several factors involved here to help bring you to your answer.

What type of conditions do you drive in? Bad idea to run low-filtration filters (K&N, CAI) in desert, dusty areas, etc. Clearly I see you're from Vermont so no desert, but if conditions in your area have a lot of airborne contaminants then it's a bad idea. Higher elevations, coastal areas, etc. tend to have cleaner air and thus reduced airborne contaminants.

To what benefit is a CAI serving you? Per se, if your jeep was a competition rig that you've invested countless $$$ in, a CAI would certainly benefit you better than it will as the ONLY power mod you've done to your daily driver.

I'm not trying to diss the aftermarket stuff b/c they're good products (well, some of them are ), just should be used in the right application. Best thing you can do to protect your engine is to keep running that dust cover (those catch a lot of the particles the filter normally wouldn't catch) and keep the filter oiled and clean. Be sure to keep the inside of your throttle body clean as well.
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Old 04-23-2010, 09:02 AM   #4
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Since I have had it in, I have checked the TB and it's clean . It's all mud up here very little dust. I guess my only reason for keeping it is because I feel it helps in the mountainous terrain I drive, probably just me but it seems like it has a bit more throttle response etc.. when going up an incline at a decent speed. I've haven't oiled in probably 5 or 6 months I hate doing it. I've read where people get used to the CAI and when they put back in the stock box they hate it.
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Old 04-23-2010, 09:17 AM   #5
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Placebo effects are quite impressive.
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Old 04-23-2010, 09:22 AM   #6
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I wish I had my stock box back
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Old 04-23-2010, 09:24 AM   #7
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Quote:
Originally Posted by mrcarcrazy View Post
Placebo effects are quite impressive.
Very true...I don't think it does much if anything but that's all I have for my keep it in motive
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Old 04-23-2010, 09:50 AM   #8
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TO those who want a stock box. Watch ebay. Just last night I saw one for sale for .01....I think it was like 10.00 shipping. but that's a heck of a price.

I was going to send a link to Jerry B (he was saying he wants one). but it was ending in 20 mins, so I gave up.
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Old 04-23-2010, 10:15 AM   #9
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I'm going to check the tube tonight and try and make up my mind. If I keep it in though I need to start oiling it at least.

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