Airbox Mod for Hyper 1100 Evo (Closed Course Racing)

[koko64]

I picked up a spare airbox for my Hyper with plans to open it up and affix a panel filter to the top of it. I have seen the MWR full open airbox and the carbon EVR complete airbox and decided to do my own.
The EVR looks the goods after examining pics of it as the filter is high and the velocity stacks are low with no lost volume and plenty of space between the two for a good charge of air. The MWR version loses a lot of volume with the stacks close to the filter and although an improvement on the stock set up it's a shame to lose all that airbox height and volume which is in short supply as it is.
Thanks to speeddog for putting me onto a guy parting out a Hyper. Cheers mate.

So I'm wanting to find a supplier of K&N panel filters in the approximate size of 6x4" or thereabouts. Can anyone give me a good source? Thanks.

I'll use the little lid of the airbox that retains the cylinder filter (which I'll remove), modify it and do a bit of epoxy work to shape it to hold a panel filter. That way I get maximum height with a gap to the tank opening and a good space from the stacks. The bolt pattern for the lid will give me a ready made retention system.
I'll need to do a bit of careful dremel work first.

[Speeddog]

You can search the K&N website for panel filters, by size:
http://www.knfilters.com/search/univ2.aspx?id=S0005

Should be able to find a common application amongst the variety of 4-wheelers in your area.
Oddly enough, I was doing that a couple weeks ago.

[ungeheuer]

My old Jeep Cherokee had a flat panel air filter of about 6"x4".....  must be heaps of automotive filters that would do the job?

[koko64]

Thanks guys.
I've found four prospects to check out. Cheers.
Will update soon.

[koko64]

Ordered a K&N HA-2511 panel filter (used in the latest Honda CBR 250).  It's roughly 6x4 or 163mm x 113mm. Will post a pic of it sitting on the airbox to give the idea of what I'm trying to do. Got some careful dremel work to do. Pretty much going for a poor man's EVR airbox.

[GK]

Where are the pics?

[koko64]

Not yet.
Still working on the mock up, haven't settled on a final design. I emailed some picks to get opinions. Maybe the filter will be too close to the top of the tank? Not sure.

[koko64]

I have decided to drop the filter an inch. After much stuffin' around and checking, it's nearly hitting the tank underside. The filter will need a bolt down frame made which will slow things down. My fabrication skills leave a lot to be desired. I'm not far off buying a set of pods . Brad suggested the mod people do where they drill out a hole on the bottom of the airbox so two holes feed the cylinder filter from above and below.
We'll see.

[koko64]

Just an update. I have a buddy who is good at shaping stuff.  I'll talk to him about making a filter frame and do this properly. Lowering the filter requires some fabrication if I want a removable, washable filter, so I'll put it on the backburner and get back to some real work.
Thanks to those guys with their feedback on the design.

I'll start another thread in the mod section about this and tuning later.