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Re: Homebrew cold air intake using dual snorkel
[Re: Fury Fan]
#130925
10/08/08 05:13 PM
10/08/08 05:13 PM
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Anonymous
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Anonymous
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Quote:
Remember, the late 70s aircleaners are set up for 3" flex tube already, so get 2 of them and put the snorkel from one onto the other. I did that with my 77 Cordoba when I was 17 (gosh, 20 years ago!).
Didn't notice any performance improvememnt, but there are lots of jetting, etc variables to investigate (which I didn't know how to do back then).
There’s an Aussie magazine website that did some investigating on this regarding using a pressure gauge and tubing at the front of the car to determine optimum placement of scoops. Do a search for ‘negative pressure supercharging’ or something like that.
high pressure always seeks a low pressure "out". there is a tremendous amount of
high pressure at the base of the windshield. there is also a tremendous amount
of low pressure inside the air cleaner assembly. the high pressure rushes in to fill
the void, thus causing a "ram" effect. thats why cowl induction hood are so effective
when sealed to the hood. with jetting/timing etc, i've seen greater then a 1/2sec
improvement using this setup. very effective to say the least.
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Re: Homebrew cold air intake using dual snorkel
[Re: Devil]
#130926
10/09/08 10:12 AM
10/09/08 10:12 AM
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Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
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Quote:
These cold air setups don't get above the boundry layer of air moving over the skin of the hood. So they have no effect on engine performance. You need to get above the boundry layer to get any noticeable effects.
The cowl induction hood uses the difference in pressure at the bottom of the windshield to get cold air effects. And the 69 A12 car's scoops just barely got into it.
Ryan
Who cares about a boundry layer when your grabbing cold air from the front side of the radiator support? Wish I had a picture but I don't. My .25 second improvement was from both COLD air AND RAM air at speed. And I think the Ram air had the bigger effect--due to the gluteus maximus dyno feeling once I reached about 70.
But the dragstrip clock proved the performance increase...over and over.
If you don't mind the look, it can be very effective. The cowl induction setups I think would have a much lesser improvement
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Re: Homebrew cold air intake using dual snorkel
[Re: Pacnorthcuda]
#130927
10/09/08 10:30 AM
10/09/08 10:30 AM
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Anonymous
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Anonymous
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Quote:
The cowl induction setups I think would have a much lesser improvement
not true. boundry bleedoff layer scoops are only as effective as to how the
air is coming off the front end of a vehicle. u have to experiment or use
a windtunnel to find the optimum height. whereas the cowl style hood feeds
from the highpressure zone at the base of the windshield. something thats
always there and consistant no matter the aerodynamics of the vehicle.
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Re: Homebrew cold air intake using dual snorkel
[Re: 70duster340]
#130931
10/09/08 10:53 AM
10/09/08 10:53 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
I don't mean to hijack this post, but something I gotta ask. If the ram air thing works as does the cold air intake, then why do these aftermarket companies sell what they call cold air intakes that are really just open air elements that are open under the hood? Won't those so-called cold air intakes just pull in the hot air from under the hood? I would think that in this case, the factory intakes would outperform these aftermarket systems, wouldn't they? 
Some aftermarket kits do go thru the core support of thru the fender. Most newer cars do pull in outside air. My 95 Dakota has duct work from the grill to the air cleaner assembly. Thus it'd be cool-air. I yanked the plastic piece the place in front of it (I guess to keep big items out) and ran a larger element.
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Re: Homebrew cold air intake using dual snorkel
[Re: 70duster340]
#130935
10/09/08 02:02 PM
10/09/08 02:02 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Need more ideas where to actually draw in cool, outside air from. I know on my satellite, the only place I can see is the block off plates in the inner fender wells. Downside to hooking up there is the air inlet tube would have to run right over the exhaust header, and it would be sucking air right in from the side of the tires. High pressure zone down there, so that's good, but also might make the engine suck up water on wet days? Quote:
I agree with ya, swingin', but there are some kits out there that are just an open box with a cone style filter attached that claim to be a cold air induction to replace the stock unit. This is on newer vehicles. I have always wondered how they can claim that it pulls in cold air if it's pulling in hot air from under the hood.
Because those kits are the biggest joke in automotive history. And the fact that so many people pay 200-300 bucks for these kits is mind boggling!
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Re: Homebrew cold air intake using dual snorkel
[Re: Mr.Yuck]
#130937
10/09/08 02:39 PM
10/09/08 02:39 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
you would just have to make another bend and carry the vent futher forward..
Yeah but to where? I'm not really in love with the idea of cutting holes in my inner fenders to draw in air.
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