Paul_J
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Registered: 6th Jun 02
Location: London
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Since I smashed up my air intake - I was thinking of making a custom one... Some sort of cone-ish thing at the front of my car to funnel air down into a pipe going over the actual induction kit area...
I'd want it to funnel down from large to smaller pipe - (like a conish thing) - so that it collects a large volume of air, and then squeezes it and thus forces the air at a higher pressure...
The question is - will this work? and what will the results be?
Turbo's work by getting lots of air in, but the cars are setup so the fuel to air mixture is correct with it...
With this since the ECU will set itself up at idle it won't have any air being forced in... its only once it starts moving air would start getting forced in and thus I'd imagine the fueling to be weak compared to the air...
Is this correct?
This is a 3d picture I did ages ago when I had the idea (its v.rough - not exactly how I imagined it but you get the idea) the wide bit is at the front...
Thanks,
Paul J
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and-m
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Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
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I wouldnt bother with that idea, just get a big bore pipe (4 inch or so) to the filter and box the cone off from the engine heat.
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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I did something similar a while back with the pipe going being sealed into the airbox.
I made the intake bit out of fibreglass.
I think its an very effective cold air intake, but apparently you wont achieve the benefits of positive pressure until something like 120mph where you'll gain 0.1bhp or something.
Dont worry about it getting to much air.
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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No matter how much air you feed to the engine, as long as there is enough fuel to match, you will be fine. If you do decide on making this custom job, dont forget about the exhaust system. Also remember that when your ECU starts to register the new air flow, it also learns how much air is flowing once you have started to drive, so its not a case of worrying that the ECU wont record how much air is being fed into the engine, since it learns and updates everytime you drive.
Dave
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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no, if there is more air than it needs then it wont suck it in.
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Rob H
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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
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quote:
Originally posted by miles
I think its an very effective cold air intake, but apparently you wont achieve the benefits of positive pressure until something like 120mph where you'll gain 0.1bhp or something.
Not too sure on that. Ive seen touring cars with piping that looks like a turbo, but it was actually from a Ram air type scoop at the bottom of the bumper  . I doubt they go over 120 MPH much. When you think about it, if you stick your arm out of the window on the motorway, there's loads of pressure acting against it. If you can effectively get that into the engine, your onto a winner 
also, dont they make a similar product for 106's/Saxo's? Might be worth making a post on SSC and ask them .
[Edited on 03-07-2003 by Rob H]
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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I dont think you appriciate how much an engine sucks.
Up until the force at 120 (ish, might be wrong) the vacuum of the engine is greater than that of the push. So it only acts as a cold air feed. People wouldn't bother with turbo's if you could just put a big funnel on the front of your car instead.
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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so u on bout putting that at the foot of ya bumper.... so its like.. a airlfow -> an induction kit, but your putting onto the orginal bit at the front of the airbox??
if so i think it would help a bit WOULD BE COOLOER!!!!!! the only thing is ... FLYS!
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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ttt
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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putting it at the foot of the bumper......aye thats all well & good till the car infront goes through a puddle & u suck 1/2 litre of water into your engine
just think about it.......common sense should prevail
drilled airbox & cold air ductin is all u need
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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hmm @ water idea.... yeh didnt realy think of that, how about just level with the bumper then?? wouldnt be so bad then
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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I think a sealed airbox with a decent sealed feed to the grill is what you are after. Could make a nice fibreglass funnel or bell mouth for it if you like.
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BeArDy
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Registered: 7th Aug 00
Location: Manchester
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the engine can only take so much air in, so no matter if u fit the biggest filter in the world the engine intakes are only one size
[Edited on 04-07-2003 by BeArDy]
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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Could make a nice fibreglass funnel or bell mouth for it if you like.
ghiimmie a rough idea how!!
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Adam_lee
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Registered: 23rd Apr 02
Location: Manchester
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Using a cone style shape on your ram to reduce the size of pipe will not increase pressure, if anything, it will decrease it. If you read up on gas laws you would find that P1V1 = P2V2, where P = preassure and V1= velocity. If you had an initial pressure (P1) of 14.7 psi (atmospheric pressure) being forced into the ram at 10 meter per second (V1) and you change the pipe diameter smaller the velocity of the air will increase. If your velocity increases to, for example 15 m/s then your new pressure would be 9.8 psi which is lower than atmospheric? This is quite possibly why the common cone filter goes from small to big. As long as you are geting enough air to suit your engine managment fuel curve and attain stoichiometric combustion, increasing the pressure probably won't do much anyway.
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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...confusing....
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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I made a mould out of md, covered it in cling film, then used a kibreglassing kit to make the shell.
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TRL
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Registered: 24th Mar 01
Location: planet tharg
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Doubt the standard injectors could deliver enough fuel if, say, 20% more air than normal was being forced into the engine.
By the way, who cares about 'air pressure'? It's air volume that matters most, then temperature.
Tony
ps....I'm well drunk!
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rollin
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Registered: 24th Apr 02
Location: Reading
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there is summin similar for the saxos its the green enclosed kit. it basically shields the air, its called a forced air kit but it doesnt force it, the pressure is the same as the engine can only suck a certain ammount of air in, the benefit is the temp of thew incoming air, it was shown to be around 10c cooler with this kit meaning denser air meaning more fuel needed equeling more power
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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indeed i wanna make 1 :/ need some idea how too make the scoop!
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Munchie
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Registered: 17th Jul 01
Location: I swap goats for mobile phones
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use a empty tin of roses
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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?!
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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squash it??
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jipp
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Registered: 31st Jan 03
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when creating a new intake pipe remember that every degree f turn it the intake pipe will actually restrict the air flow by creating turbulance. vauxhall used this principal to 'detune' the corsa engines by having 330 degrees of tun it the pipes
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
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y would they de-tune it??
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