OEM Air Box Question

[JasonZBell]

Hello All,

Can anyone tell me roughly the internal size in inches of the OEM air box? I am looking to fab up a setup involving a K&N cone filter that is 6" wide at it's widest point and I need to know if that would fit in the stock air box when completely sealed. For reference, here is the K&N filter I am looking to install, along with a velocity stack on the back of this filter.

http://www.amazon.com/gp/product/B00062ZNEA

Thanks in advance,
-Jason

 

[mystican]

If I am not mistaken, RTR tried this years ago and other types of filters. They ending going back to OEM with the OEM filter...and stuck with it...and they had numbers to prove it.

 

[nigel]

STOP, cone filters suck. They let in HOT air.
Stop, leave the OEM air box alone. Unless you can afford an SOS box leave it alone.
Stop, get an OEM K & N filter replacement and install it. Be sure and oil it first.
Stop, if you have to do something, get a DF cold air intake.
Stop, this isn't an old Prelude or Accord. Don't try to make the same mods those people do.
Stop, before you ask, no "trash can" sized resonator muffler tips.

Cheers
nigel

 

[davidf]

I thought Dali offered a cone filter for the stock airbox.

 

[JasonZBell]

STOP, cone filters suck. They let in HOT air.
Stop, leave the OEM air box alone. Unless you can afford an SOS box leave it alone.
Stop, get an OEM K & N filter replacement and install it. Be sure and oil it first.
Stop, if you have to do something, get a DF cold air intake.
Stop, this isn't an old Prelude or Accord. Don't try to make the same mods those people do.
Stop, before you ask, no "trash can" sized resonator muffler tips.

Cheers
nigel

Nigel,

I got a kick out of that! If I was using this setup in an NSX, I would do as you recommend, however this setup is intended to be tested in a Honda Challenge 93 Civic Hatchback with a ITR swap in it. There has been testing done by quite a few people with the OEM ITR airbox, along with the OEM intake arm and it has yielded great results when modified to pull cold air from behind the front bumper.

What I would like to do is great a similar setup. Use the OEM NSX airbox along with a 3.5" tube from the TB to the airbox. Then, stuff a K&N in the airbox with a velocity stack inside that. Then punch out a 4" hole in the bottom of the airbox and run piping down to the front bumper. Obviously, the goal here is to great a sealed enclosure with larger piping to suck in cooler air while also using a cone style K&N with velocity stack.

So, if anyone can tell me for sure, I just need to know if there is room inside the OEM airbox to stuff the K&N. The K&N is roughly 6" x 6".

Thanks all,
-J

 

[docjohn]

With the opening of any tube so far from the engine you will certainly have decreased air volume to the engine.You can try your K&N in the box trick but use the oem side intake as your start point.

 

[JasonZBell]

With the opening of any tube so far from the engine you will certainly have decreased air volume to the engine.You can try your K&N in the box trick but use the oem side intake as your start point.

Any idea is the K&N that size will fit in the sealed box?

Thanks for all the responses so far. Been a great help.

-J

 

[docjohn]

afaik the K&N cone recommended by the manufacturer is made to replace not go into the oem box.Therefore you would need to spec a smaller filter from K&N that will fit inside and has the same or similar adapter diameter.Let us know what you come up with.

 

[JasonZBell]

afaik the K&N cone recommended by the manufacturer is made to replace not go into the oem box.Therefore you would need to spec a smaller filter from K&N that will fit inside and has the same or similar adapter diameter.Let us know what you come up with.

Yeah I am aware of this, however I am trying to fab up an intake using the NSX airbox into a B series swapped civic hatchback that runs in the Honda Challenge. So all I really need to know is where or not a K&N filter that is about 6" in diameter would fit into the sealed NSX airbox.

-J

 

[angus]

You could always buy a stock airbox and try it , but what everyone I trying to tell you , is that it has been tried before and the best flow is achieved with a panel filter in the box , more surface area (what I assume you are trying to achieve ) does not always mean more power. The thing to take into account is airflow, it seems honda has gone to great lengths to design the nsx airbox to flow with a panel filter , if it were better with a cone ,they would have done it! They did it in the 94-01 integra ,including type-r. I am thinking that the reason for the cone inside the box being worse is due to turbulence and volume issues

 

[nsxnut]

Ok let's try a helpful response.

Looking at Dali Racing website they offer APEXI and FUJITA cone filters in a modified oem air box.
I suspect they are roughly the same size as a K&N cone filter.

http://www.daliracing.com/v666-5/catalog/index_browse_part.cfm?focus=1102#tabSimilarStuff