CAI hood vent?

[Jand3rson]

When I get my E30, I'm planning on building a heatshield for a cone filter very similar to Jordan's, and I want to have the top of the shield sit flush against the underside of the hood when it's closed, so I was trying to think of a way to have colder air forced into the filter. I was thinking about getting one of these hood vents from a Jeep Grand Cherokee, and fitting it in the hood directly over the filter, but turning it around so that it sucks air in instead of venting it out. What do you guys think?



(Just so everyone knows, it wouldn't be THAT vent exactly, I'd like to find something
a bit more low profile, that would end up looking like this, flush with the hood)


BTW, please keep flaming comments and bashing to yourself. I'm certainly open to constructive criticism and other ideas, but I'm not interested in anyone griping about how it would look ricey, or any other crap. If you don't have anything useful to say on the matter, don't say anything.

[rwh11385]

Sweet, cold rain induction.

Noble idea Josh, and nice thinking but....

1) What good will it really do? Even noticable?
2) It will look ricey.
3) Water.....would be fear of mine. (guy who went to my school destroyed his integra motor by ingesting water through a CAI)

Primarly #1 is the main point.

btw, IBTL......

[Jand3rson]

Sweet, cold rain induction.

Noble idea Josh, and nice thinking but....

1) What good will it really do? Even noticable?
2) It will look ricey.
3) Water.....would be fear of mine. (guy who went to my school destroyed his integra motor by ingesting water through a CAI)

Primarly #1 is the main point.

btw, IBTL......

First, the IBTL. There's no reason this thread should be locked, should people be able to behave themselves.

I would imagine their has to be an advantge to pulling in that colder air that's going over the hood.

I don't think it would have anymore issues with water than the guys who have one of their high-beams removed.

And I'm not worried about what it would look like. It's going to be MY car.
I'm going for a look similar to this. In fact, it's where I got the idea.
My aim is to have it facing the other way, so it pulls in air.

[rwh11385]

If you want to do your project car, and make it all you want it to be, go for it. You shouldn't care what other people say anyway.

It just might be a waste of time and energies and money, or if not waste.....hmmm, you could be spending time and $ on better things. Like just maintence that will happen, just as the grief you are going through with wifey's car. You might be occupied with those issues, and suspension.....you won't have until way down the road time to worry about intakes.

If it is raining, water might run down the went, through the screen, onto (into) the filter. Rain does move vertically down, and not horizontal, besides strong wind/fast speeds. Just a concern.

and

There's no reason this thread should be locked, should people be able to behave themselves.

There ya go. You should know better than to actually believe that might happen, here.

[Jand3rson]

If you want to do your project car, and make it all you want it to be, go for it. You shouldn't care what other people say anyway.

Exactly my point. What I plan to do is do it a rough version of it on my spare hood and run that on the car. If ends up being something that will work well, I'll move on to doing a cleaner verison on the good hood. If not, I've cut a hole in my spare hood, and learned something from it.

Something that people need to realize around here is that when someone puts forth an idea or does something to their car, they're not telling you to do it to. That's the beauty of a public forum like ours, is that I can throw this up here and see what kind of responses I get, and based on that, I can decide whether or not I want to go ahead with it.

So getting back on topic... :D

[DSchultz325e]

that would be neat. you should do that. it would be unique, for sure

[T.Dot E30]

here is an e30 with a scoup, not really a grill like ur planning, but i guess u can get a better picture of it.

BTW: Car is turbo'd thats why its on the wrong side.

[bmwannabe]

<sarcasm> go ahead and cut a hole in your hood, let us know how it turns out . </sarcasm>

[KenC]

Will it provide enough (or any rather) gain to be worth you efforts?

[M-technik-3]

Put a louvered unit on hood or in fender. Mercedes did the louvered fender on the older E320 and it looked good, so good that it was adopted by aftermarket for awhile.

[Jordan]

Why don't you see if your new e30 lasts more then a week before you try giving it more power for nothing?

[Digitalwave]

Why don't you see if your new e30 lasts more then a week before you try giving it more power for nothing?

I'm gonna have to agree here. I think you should first buy an E30, get it sorted out, set your priorities, and then start posting/worrying about mods like this.

I think the fact that to do this right, it'd probably cost in the $600-1000 range. And your E30 purchasing fund is down to half the price of just venting your hood... well why does it matter now?

Why don't you just get one of these intakes? It'd be cheaper, and the rice factor is about the same as a vented hood.

[StereoInstaller1]

The best place to have a cold air intake is at the base of the windsheild. You could suck air in there and not have it visible at all.

Or, is the visibility your goal?

If so, I really like the Audi's look. Far better than that e30's hood wart. Cutting slits and forming the metal would be within reach of any competent bodyman, or you could go to JCWhitney and buy a fiberglass version and mold it in.

Remember, the idea is to have air flow across the intake vent, causing a low pressure zone, allowing the engine to pull it in. If you try to "force" it in, you will not succed in getting more air to the motor due to the high pressure zone creating too diffucult a barrier of air pressure. If you are thinking of a "Ram Air" deal, go look at Jet aircraft intakes. Basically, if you removed your grille and installed an " F15" type duct,(looks like a pig's snout, basically) you could probably gain as much as 2 or 3 HP at speeds over 100 or so, but the drag below those speeds would make it lose power.

Post pics, man!
Luke

[MattM20]

The best place to have a cold air intake is at the base of the windsheild. You could suck air in there and not have it visible at all.

Or, is the visibility your goal?

If so, I really like the Audi's look. Far better than that e30's hood wart. Cutting slits and forming the metal would be within reach of any competent bodyman, or you could go to JCWhitney and buy a fiberglass version and mold it in.

Remember, the idea is to have air flow across the intake vent, causing a low pressure zone, allowing the engine to pull it in. If you try to "force" it in, you will not succed in getting more air to the motor due to the high pressure zone creating too diffucult a barrier of air pressure. If you are thinking of a "Ram Air" deal, go look at Jet aircraft intakes. Basically, if you removed your grille and installed an " F15" type duct,(looks like a pig's snout, basically) you could probably gain as much as 2 or 3 HP at speeds over 100 or so, but the drag below those speeds would make it lose power.

Post pics, man!
Luke

low pressure across the top of a vented hood would cause air to be sucked out of the engine bay, which would help expel heat, but wouldnt aid in more air molecules entering the engine. that is most likely the effect that the audi and jeep vents were trying to achieve.

[cramer]

i'm not a fan of hood scoops, specially ones that stick up above the hood. The Sport Quatto's was designed to let the air out and if you reverse the vents I think they end up looking odd.... Also, as mentioned above, if you have an open filter element it will get soaked here in the rainy northwest.

One vent i do like, a friend had on his corrado:





it's basically a 924 turbo style where you cut the hood, pull lit down and weld sides onto it. Pretty simple and yet very clean looking. He ran an open filter but the beauty of this design is the vent actually let air in behind the fitler (the filter sits just forward of the opening). The air enters the hood, hits the back of the cold air box and circulates, creating a cooler zone inside the air box that the engine can draw air from.

also, doing something like a fender vent would look better and not have the problems of getting the filter soaked.