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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 04-27-2011, 06:18 PM   #1
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Home made cold air intake

here is my home made Cold Air intake...

Cost me 8,75$ for the aluminium bulk sheet metal. I already had the filter. Not as nice as afe, KnN and others, but bang for the buck is hard to beet on this one!

that's it!
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Old 04-27-2011, 06:32 PM   #2
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Old 04-27-2011, 06:37 PM   #3
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Ghetto, but functionnal
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Old 04-28-2011, 05:27 PM   #4
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If you powder coat it, you will never tell the difference!!! LOL!!!

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Old 04-28-2011, 05:50 PM   #5
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The problem with metal is that they absort / attract heats.
Example with Turbo Kit, they come with aluminum intercooler pipe is to extract heat from the liquid inside. Another word, help cool down faster. BUT. If you are in L.A. traffic, meaning if you are at a stop and your car is not moving there is no circulation inside your engine compartment. As you begin to drive from a stop about less than a minute or so, you might feel no power from the car. Best way for a homemade heat shield is to use anything other than metal / sheet Metal.

Don't get me wrong. The fabrication you did with the metal is awsome, especially the circle for the MAF to enter through. I would recommend using the sheet metal as a skeleton structure and use plastic as a skin/cover.

The sheet metal is a great idea, but the problem it attracts heat. I would want to try it with expand metal and cover it with plastic sheet.


The problem I have with my aluminum pipe attracts TOO MUCH heat.

After I driven the car; parked on my drive way, pop the hood and check on the heat shield. The aluminum were pipeing HOT.

LOL the pic shown is just an early stage of fabrication. The final product of my HEAT Shield FAIL.
/// ( @ )( @ )

BMW /// 323i

OEM M-Tech II front & rear bumper /// Cluster Ring /// Grimace Fog Lights /// CCFL angel eye

330i Diff /// REMUS Exhaust /// Heat Shield Cold Air Intake

Last edited by sellsellsell2000; 04-28-2011 at 06:03 PM.
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Old 04-28-2011, 07:21 PM   #6
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Aluminium has a high heat conductivity, but as it is kind of polished, it has good resistance to radian heat (low absorptivity) , which is the goal of the this heat shield. Moreover, Aluminium doesn't transmit a lot by radiation (low emissivity), which also help. In fact, being unpainted help for the radiant heat resistance.

Aluminium will heat faster due to high air temp sorrounding on the engine side, but the final heat of aluminium vs plastic, once the heat system has stabilized, wont be that different (Always depending of vehicule speed) ... Well I guest from what I remember from school!!
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Old 04-30-2011, 07:06 PM   #7
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clip of its sound: http://forum.e46fanatics.com/showthr...9#post13108069
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Old 03-31-2017, 01:44 PM   #8
Wesley Vazqueztell
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What are the dimensions??
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Old 04-20-2017, 10:32 AM   #9
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That's actually pretty impressive good job!
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