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Thread: Homemade cold air intake

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    Member RIVI72's Avatar
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    Default Homemade cold air intake

    So last weekend my friend got a K&N cold air intake for his mustang and that gave me the idea of making my own so i went to Canadian Tire and got some aluminum dryer hose and cone filter



    Not bad for 50 bucks compared to $350 my friend spent i thought it wasnt a bad deal
    The car really wakes up at mid range and thru upper range rpm and makes nice little growl and with the cherry bomb turbo lol dont laugh it almost sounds like a grand prix gtp


    And the best part driving along on the highway you can actually hear it suck air
    1990 Oldsmobile Cutlass Ciera 3.3 v6
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    Now it is time to get the L67 in between the fenders
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    How flammable is the dryer duct?

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    Senior Member brp2z's Avatar
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    not bad

    sure that dryer hose has a lot of drag but the placement is good. i have a couple silverado intake peices im using to make one for the buick
    but i had an issue with location

    i imagine i could put one where you did

    good job

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    Senior Member jinxtigr's Avatar
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    As somebody else who makes intakes MacGyver-style, I have to say- you should be using a different type of hose, I think.

    I'm using air conditioning duct parts that are steel, held together with steel clamps, and there's a duct where you have it, piping air to the filter area, but mine is the more rigid aluminum duct, and even that I'd be wary of between the throttle body and the filter.

    My concern is that vibration and suction (and the very high sound pressure levels of the engine intake itself) will vibrate your duct until it breaks. When it does, pieces of duct will get sucked into the engine, along with engine compartment debris if any. Aluminum isn't really harder than steel and it's not like incompressible water so it might survive a duct failure... but for me, I totally would be using something else. I wouldn't use the materials you're using.

    You're right though- surface drag isn't that big a deal. Duct area matters, and making airflow go around corners or through bottlenecks matters, but the shape of the duct isn't going to be a big problem.

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    Senior Member The Mad Hatter's Avatar
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    Jinx, you said you would be concerned with materials between the filter and the TB, would using PVC be bad as well. I've seen some guys with those setups before, and i wondered if it would work.
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    Senior Member dagr8tim's Avatar
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    I've seen more than afew dryer duct intakes. The stuff is ok, but far to thin. What some people use is the rubbed rubber hose that is 2 to 3 inches in diameter. This is often used on landscaping equipment (leaf blowers and sometimes on bagger systems of large drivable mowers). It's also been known to be used as intake hose on larger trucks. Infact I have a 2+ foot section I snagged from a junk yard afew years back that is 3 inches in diameter.

    That being said, I have 2 suggestions for your current setup.
    #1. Some form of splash shield so that you don't end up hydro locking your motor in a heavy rain.
    #2. Adjusting the tubing so that there is a low point between the filter and the intake. In this low spot, cut a small hole to act as a drain, when said water (from suggestion #1) gets into your intake hose.
    Tim
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    Quote Originally Posted by jinxtigr View Post
    My concern is that vibration and suction (and the very high sound pressure levels of the engine intake itself) will vibrate your duct until it breaks. When it does, pieces of duct will get sucked into the engine, along with engine compartment debris if any. Aluminum isn't really harder than steel and it's not like incompressible water so it might survive a duct failure... but for me, I totally would be using something else. I wouldn't use the materials you're using.

    You're right though- surface drag isn't that big a deal. Duct area matters, and making airflow go around corners or through bottlenecks matters, but the shape of the duct isn't going to be a big problem.
    There should be a metal screen right where the air filter housing to throttle body hose would have connected that would stop *most* particles. You would have seen it if you looked into the TB. People have considered removing it because it could be restrictive-its not, and its the last line of defense.

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    Senior Member jinxtigr's Avatar
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    Oh yes it is restrictive, and I thought that was what that was for. So, yeah, if you have that there, it would catch any chunks of hose, but better not to have them.

    I think you could use PVC. I've also used the heavier dryer duct, the kind that is aluminum that comes compacted and you stretch it out into shape- that stuff should be good.

    Now I'm wondering about the possible benefits of a nonrigid air intake- bear in mind there is a suction that is as strong as the resistance of the air filter to air coming in. The thing has to be able to suck a bunch of air through paper (or whatever you use) so there are limits to how weak it can really be without fatiguing and breaking. It's not just a breeze blowing through there.

    I need to make my fiberglass air intake... the horn shaped one I thought of...

    Also, hydrolocking will happen if the whole intake is underwater. If I understand correctly, as long as air is coming in as well as water, the engine should survive. It's not the presence of water but its incompressibility that causes hydrolocking- if the cylinder has more water in it than the volume of the piston at full compression, it's gonna break. That's a lot of water to take into a cylinder that many times a second into a hot engine... just make sure the air intake isn't underwater. (relevant for things like Minis with the air intakes very low)

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    Member RIVI72's Avatar
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    So do you guys think i should go to something like this


    Hey dagr8tim what kinda of vehicle did you get your 2 foot section off of
    1990 Oldsmobile Cutlass Ciera 3.3 v6
    16" cutlass supreme 5 spokes
    Now it is time to get the L67 in between the fenders
    "DIE HARD A-BODY FAN"

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    Senior Member dagr8tim's Avatar
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    Quote Originally Posted by RIVI72 View Post
    Hey dagr8tim what kinda of vehicle did you get your 2 foot section off of
    That's pretty much it. I'll try to get a pic of the section I got in the next day or two. Sadly the yard I go to doesn't separate trucks & full sized vans by make. I actually found it laying on the ground over in that area. I would look for Ford F & E 150's through 350's, and GM/Dodge from 1500 through 3500.

    Maybe even sniff around suppliers for the larger 450's & 4500's that are more commerical type trucks.

    Quote Originally Posted by jinxtigr
    Also, hydrolocking will happen if the whole intake is underwater. If I understand correctly, as long as air is coming in as well as water, the engine should survive. It's not the presence of water but its incompressibility that causes hydrolocking- if the cylinder has more water in it than the volume of the piston at full compression, it's gonna break. That's a lot of water to take into a cylinder that many times a second into a hot engine... just make sure the air intake isn't underwater. (relevant for things like Minis with the air intakes very low)
    I've seen cars hydrolock on relatively small amounts of water. I have to think in a driving rain storm at highway speeds with the filter directly behind the grill, you could suck enough water through your intake to hurt the car. I know guys that use water injection on classic fords, and they go through 6 - 8 ounces per tank of gas (300 - 400 miles).
    Tim
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    the honeycomb IS really restrictive! I've removed it and feeled a power gain better throttle response and acceleration!
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    Senior Member brp2z's Avatar
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    i had 2 old o2 sensors and i removed the honey comb from one and all it did was die

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    Senior Member LordDurock's Avatar
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    if ypu bend some thing to go around the back ofthe cone filter you will get a better ram air set up. (note that what oyu have is not a cold air intake but a ram air set up)

    Quote Originally Posted by LordDurock
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    Senior Member dagr8tim's Avatar
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    Quote Originally Posted by LordDurock View Post
    if ypu bend some thing to go around the back ofthe cone filter you will get a better ram air set up. (note that what oyu have is not a cold air intake but a ram air set up)
    Other than using a different hose/pipe, the only other suggestion I have is some kind of shield. That would also keep water from getting directly sucked up in the intake.

    I've seen people modify an old coffee can for that, the problem is that they rust too quickly, but something about that shape and size would be perfect as a dust/rain shield.
    Tim
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    Senior Member brp2z's Avatar
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    plastic coffee can?
    and some paint

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