Stock Intake to cold air intake - Chevy and GMC Duramax Diesel Forum
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post #1 of 9 (permalink) Old 10-21-2008, 06:37 PM Thread Starter
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Stock Intake to cold air intake

I have heard about some guys modifying their stock intake on their lmm's to work as a cold air intake and that it actually works better then some cold air kits that you buy.

Truth or Lies?

Thanks

Jason
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post #2 of 9 (permalink) Old 10-21-2008, 06:40 PM
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yeah u can cut the plastic fan looking piece in the stock intake after removing it, to let more air in, some say the stock intake is good up to 500 hp, and that a cold air intake does nothing , im on the other line since i have dynoed mine to see, and their was gains , not much but some
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post #3 of 9 (permalink) Old 10-21-2008, 06:42 PM Thread Starter
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Thanks. So you don't know first hand for sure what it really does? help or no help?

Jason
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post #4 of 9 (permalink) Old 10-21-2008, 06:44 PM
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well yeah it will give you more air for sure , its quite a bit of plastic u cut out,
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post #5 of 9 (permalink) Old 10-21-2008, 06:46 PM Thread Starter
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How much crap does that let up in there though? I guess thats not a big deal as long as i keep the filter clean

Jason
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post #6 of 9 (permalink) Old 10-21-2008, 06:48 PM
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when i had mine done , i didnt see any more dirt on the filter, and we are in a very dusty city
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post #7 of 9 (permalink) Old 10-21-2008, 06:49 PM Thread Starter
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Thanks i appreciate the help. Doesn't sound to hard. I'll give it a try. Where is this fan type piece?

Jason
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post #8 of 9 (permalink) Old 10-21-2008, 06:52 PM
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the true purpose for a cold air intake is to allow as much cool properly filtered air as possible into the engine but now there are filters out there that allow all kinds of air thru but do they filter the air properly not like they should that is why the OEM Donaldson filter is at times regarded higher then some aftermarket ones since it filters the air throughly,now it mite flow as much air but it filters it properly which is better then lots of air anyday since the turbo isn't put in danger.now Killerbee has done tons of researching and if there is anyone on the site he would be the guy to ask.this is simply my opinion.

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post #9 of 9 (permalink) Old 10-22-2008, 07:26 AM
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The "plastic fan" is a centrifugal water and particulate separator, a collection of airfoils that spin intake air befor it hits the element. Anything heavier than air will spin to the outside (like one of those city park push rides that throw the kids off into the dirt) so that the water eventually collects in the collection tube underneath. When you let off the power, it all spills out the bottom.

If you remove it, you get potential for a wet element.

But in all honesty, unless you have ramped up the power so much that your filter minder is puliing in to the red, there is not much point.

If you are seeing red with a clean element, consider removing alternate vanes, also may want to open up the fender openings as well.

Michael
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