"Screens" for ITBs

I have a space issue using the "sock" filters that came with my ITBs.

Looking for screen-style filters that actually work to put over them so i can have a fighting chance at seeing the front of my car while driving it.

Anyone have a source?

If it helps, i'm using Gixxer 1000 throttles.

I'd love to have something like this, and i suppose i can make it if i have to, i'd just rather not. http://forums.club4ag.com/zerothread?id=65539

Unfortunately, screens are both restrictive and poor at filtering. The poster of that DIY thread did a pretty good job with the foam in there, so those are just restrictive Can you put a plenum over the horns so you can filter the air elsewhere?

Yeah those things that guy built are terrible, worst of both worlds.

Regular sieve-style screens aren't restrictive but they do suck at filtering. Could you get individual cone filters that are smaller than the "socks?" I've seen some big foam block filters that sit over all of the ITBs, those should have similar restriction to socks and may be smaller.

Edit: Here's an example of a "foam block" filter:

And here's an example of a good "screen" filter, good for keeping small animals out of engines that are regularly rebuilt anyways:

The more domed they are the better. These are DIY'ed BTW:

https://thes2kandtheant.files.wordpress.com/2011/05/p8.jpg?w=950

Keith Tanner wrote: Unfortunately, screens are both restrictive and poor at filtering. The poster of that DIY thread did a pretty good job with the foam in there, so those are just restrictive Can you put a plenum over the horns so you can filter the air elsewhere?

Nope no can do. They're already sitting a good 3-4" above the hood.

I found a site that sells them Ben, but like Keitth mentioned, you do t want screens. I've spent a bunch of time recently researching this for the Europa, and will be implementing an air filter housing similar to this: http://www.dunnellengines.com/zetec_components.php?partno=RMP990

Only built with junk from Autozone, a K&N filter, some bailing wire and scrap metal. 8)

If clearance prevents something like that, I'd look into extending your runners before the ITBs to allow a filter box somewhere - just tune it to the nearest harmonics.

GameboyRMH wrote: Yeah those things that guy built are terrible, worst of both worlds. Regular sieve-style screens aren't restrictive but they do suck at filtering. Could you get individual cone filters that are smaller than the "socks?" I've seen some big foam block filters that sit over all of the ITBs, those should have similar restriction to socks and may be smaller.

Maybe....

If you go further down in that thread, there was a guy that made them with screens instead of foam.

I don't really like the socks because of restriction and the height, really.

I don't think i'm HUGELY concerned about filtering, but it'd be nice to at least keep the huge chunks out. This is a car that will see less than 3,000 miles a year.

Kinda looking for something like this:

The "big foam block" ones don't offer any restriction at all, I've tested them on my cars. But they're definitely bulkier than most sock filters.

The sieve screens are surprisingly restrictive, actually. I think it was Vizard who discussed them in some of his books. You can do the math - if you have 0.025" wire with 10 openings per inch, then 44% of the surface area is now blocked and the remaining holes are going to have some pretty poor airflow.

petegossett wrote: I found a site that sells them Ben, but like Keitth mentioned, you do t want screens. I've spent a bunch of time recently researching this for the Europa, and will be implementing an air filter housing similar to this: http://www.dunnellengines.com/zetec_components.php?partno=RMP990 Only built with junk from Autozone, a K&N filter, some bailing wire and scrap metal. 8) If clearance prevents something like that, I'd look into extending your runners before the ITBs to allow a filter box somewhere - just tune it to the nearest harmonics.

I like the Dunnell, but i end up with the same issue of not being able to see. That's gonna add a good 2-3" on top.

I can't really extend anything either... i'm as short as i can go and still half of the setup is sticking out of the hood. I'm ok with that, i just can't/don't want to go any farther up.

Keith Tanner wrote: The "big foam block" ones don't offer any restriction at all, I've tested them on my cars. But they're definitely bulkier than most sock filters. The sieve screens are surprisingly restrictive, actually. I think it was Vizard who discussed them in some of his books. You can do the math - if you have 0.025" wire with 10 openings per inch, then 44% of the surface area is now blocked and the remaining holes are going to have some pretty poor airflow.

Hrm ok...

I assume i'd have to make something up custom to get a foam block on my car? I'm cool with maybe another inch added, 2" at maximum, but even that might become an issue for SWMBO driving the car and seeing cones on the right side.

Build a short airbox that positions the filter element at the low-pressure zone at the base of the windshield?

It's easy enough to fit a proper filter. You can buy undrilled backing plates from the filter supplier. Then you just poke holes where your horns go through.

Here's one setup I played with some time ago. That first filterless picture may be with the long horns that don't fit under the low-profile filter, but it gives you an idea of how it fits.

A low-profile plenum solution that fit where socks and the big filter wouldn't.

Hrmmm... that looks easy enough, except for one problem that my setup seems to pose. I don't really have a way to make the metal backing plate for the filter to attach to, since my stacks clamp on instead of bolting.

Le sigh.

Maybe i just need to find some 1-2" socks instead of the 4-5" monstrosities i have currently?

DaveEstey wrote: Build a short airbox that positions the filter element at the low-pressure zone at the base of the windshield?

I'm afraid i'm not following that one i don't think...

Unless you mean build a plenum of sorts and run it all above the hood?

Just put a scooby hood scoop on the deathscort and make the "filter element" be part of the hood/scoop that seals when the hood is closed.

yamaha wrote: Just put a scooby hood scoop on the deathscort and make the "filter element" be part of the hood/scoop that seals when the hood is closed.

Looked into that, it's not big enough.

Think of it as a low profile filter box that covers the ITBs, but with the element at the back near the firewall where it looks like you have room. More clearance for a bigger filter - more flow, but low profile where you're running short on room.

92CelicaHalfTrac wrote:

DaveEstey wrote: Build a short airbox that positions the filter element at the low-pressure zone at the base of the windshield?

I'm afraid i'm not following that one i don't think... Unless you mean build a plenum of sorts and run it all above the hood?

Pretty much it sounds like running a cowl scoop with a filter. Visibility issues can't be avoided since you went with the ITB's on that vehicle.

I'd look at raising the seat for the driver(s) to help with visibility.

Another option might be to add some 90 degree tubing behind the ITB's to rotate them and gain clearance for filters and tune the intake length. You may still have pieces sticking through the hood, but they won't be the ends of the ITB's.

You could always do what dave said and then build a "power dome" in the hood to clear everything........basically, the dome doesn't kill your foreward vision anyways.

I still think if you're looking at the cone 10ft in front of you to whichever side, you're not doing it right anyways.

Edit: OB needs to see my '91's hood........about a 1-2" power dome on it, no visability issues.

I would think that making an airbox over them would be the best solution.

Yeah it does suck to put a horrible unsexy airbox over ITBs but that does look like the most functional solution...

Make the "bulge" out of clear plastic so it can be seen through?

92CelicaHalfTrac wrote: Hrmmm... that looks easy enough, except for one problem that my setup seems to pose. I don't really have a way to make the metal backing plate for the filter to attach to, since my stacks clamp on instead of bolting. Le sigh. Maybe i just need to find some 1-2" socks instead of the 4-5" monstrosities i have currently?

So attach it to the fuel rails or the intake manifold on some standoffs. Shouldn't be insurmountable to attach a piece of metal to the engine.

In reply to turboswede:

JohnInKansas wrote: In reply to turboswede:

Exactly.

I think maybe i need to clarify something here...

I was looking for screens because they're the easy button and fit within my timeline. I don't expect them to be a long term solution, but however they will help me hit my end-of-the-month deadline to get the car to the tuner. I do not have time (or the skills more than likely) to build an airbox or a plenum or any of those things. I'm fully aware of their shortcomings and i'm ok with the risks, especially since this motor isn't expected to live long anyways.

Unfortunately, i really just have time to slip 6 filters of some sort over 6 stacks.

I DO appreciate the input that i've gotten in this thread, but most of it doesn't really address the original question. This is my fault, since i didn't really qualify why i was looking for what i was looking for.

The extent of the work the hood will be receiving at this stage involves a cutoff wheel, a sharpie, and 10 minutes.