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HomeBrew CAI re-do

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Old Jul 25, 2010 | 11:50 PM
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Default HomeBrew CAI re-do

The first one i made turned out just fine, but the bracket I made to hold it could have cost me my engine. Somehow, one of the bolts on the bracket came off and kicked the filter completely off. Luckly when I wash my truck I'm **** about water spots and opened the hood and found it. I did my best to make one of those small T intakes but no matter how I did it something was in the way or wouldn't reach. So after lots of beer, cursing and a nervous breakdown this is what I came up with. I'm really pleased with the way it came out and the bracket built for this one is MUCH sturdier and safer. Let me know what you guys think.

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Old Jul 26, 2010 | 11:18 AM
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too short, too close to the engine (IMO). the closer you are to the engine the more heat it will suck. "Cold" Air Intake, try to put it further away along with a heat shield. other than that, its very clean
 
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Old Jul 26, 2010 | 11:35 AM
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I tend to agree somewhat with sinus here - run it a little farther away from the engine and shield it, so that it might get some cooler air.

Sinus - I'm curious about your setup. Does it pull air in through the tube in front of the air cleaner? It looks like it would draw in air from around the diameter of the filter, and not through the nose.
 
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Old Jul 26, 2010 | 01:28 PM
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Yeah that's what i thought to .Because the filter would get the air and not thru the hoseIt would be sucking air into the filter first wher the hot air is(right)IMOO
 
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Old Jul 26, 2010 | 03:53 PM
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id have to agree with both statements above on both members...o/p too short still getting to much engine heat /air....sinus you have more filter area exposed to the engine air thus with more area exposed suction takes the route less restricted so, very lil it actually going into the hose not very beneficial...from my experience with pneumatics and hydraulics(which hydraulics is essentially affiliated with pneumatics) in school....the only way to tell for sure what your intake air temp is is run some datalogs with a s/c tuner....
 
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Old Jul 26, 2010 | 05:05 PM
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i ran the K&N 57 series on the last truck, the "heat shield" was a joke. That did nothing for keeping heat away from the filter, top was open, bottom was open, a portion of the side open and the hole that the tube went through was way too big. Im not as worried about if its getting engine air instead of this hot *** Texas air ( which is probably only about 10 degrees different) as I am that its actually breathing now. It sounds alot better with this one on there and the truck feels like its more responsive. Im also hoping to eventually get a functional hood which should do real well with this set up I think. I figured I'd give it a try both cause I like the look of it and because there are several guys on here with shorty/T tube CAI's that they seems to have good things to say about. Thanks for all the comments/advice though guys, I do appriciate it.
 

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Old Jul 27, 2010 | 03:04 PM
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Originally Posted by jusjay727
id have to agree with both statements above on both members...o/p too short still getting to much engine heat /air....sinus you have more filter area exposed to the engine air thus with more area exposed suction takes the route less restricted so, very lil it actually going into the hose not very beneficial...from my experience with pneumatics and hydraulics(which hydraulics is essentially affiliated with pneumatics) in school....the only way to tell for sure what your intake air temp is is run some datalogs with a s/c tuner....
I now have a heat shield that i made out of some Stainless Steel. and yes the filter has an opening in front, so one end of the yellow hose goes to the filter and the other end goes to the fog light hole in the bumper giving it cold air directly from out side.... at least thats the theory...
 
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Old Jul 27, 2010 | 03:13 PM
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i understand your theory and you would think it works im sure your getting some outside air but my theory is flow will take the path of less restriction, thus more area of the filter is exposed to the inside engine bay air vs. outside so im afraid your getting more engine air than outside air....because of area on filter being more inside than just the tip of it....great idea im not knocking it at all just stating what i have learned....op i have a heat sheild and my filter is near right headlight i ran some diagnostics and my intake air temps are around 70 in 95* weather in fla....with c.a.i and powerwire....w/o that sheild it would be more for sure.....
 
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Old Jul 27, 2010 | 04:23 PM
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You are sort of right on the flow theory JusJay727, however the filter he is using is a Spectre filter which is designed to pull air from the front of the cone, it actually has a small cone in the center opening in the front of the filter to create a cyclonic vacuum effect when in use. Not all Cone filters are created equal, actually if you put this filter on and run it and then stick the same size cone filter with a flat non-open front there is a considerable noise difference in sucktion. As far as that pipe going from the front fog light to the front of the cone, you may be defeating the purpose the filter was designed for by changing the path of air flow and velocities that it can suck under load. Not saying it is bad, or wrong just don't understand why the manufacturer wouldn't do this if it was necessary.
As far as being to short, I would have to agree with everyone on this thread. You may have hot air outside but the air under your hood is even hotter no matter what. This is why they call it a CAI (COLD air intake). You did a very nice job on it though and I'd agree that it looks very clean. I especially like the Breather hose with the spring on it. How is this connected to the PVC.

If you decide to change your CAI, or if anyone else is looking to build one here is a list of parts that I posted quite some time ago for home brews, tag #43. This will put you intake at the front of the truck.
https://dodgeforum.com/forum/3rd-gen...fab-cai-2.html
 
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Old Jul 27, 2010 | 04:45 PM
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okay ill give you that on the cylclonic cone.... but like i said there more surface area exposed to engine temps than the end or cyclonic tip to pull air, it will take the road of least restriction, therefore with more area on the sides it shall take that route....im just finishing classes on pneumatics and i been studying air flow for a good minute now and its stuck in my brain...im not saying im right or your wrong but all in theory of what i have been being taught and studied ....
 
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