Air box, volume calculation

[jack&mle]

Hi

I'm looking to built an air box for my engine a 1.8K vvc.

The air box will be connected to the air filter by a 120mm diam tube 400mm long and the air intake of the air box is about 180mm diam (it will be based on air box from an Exige)

What do I need to be aware to design an air box?
Is there some special calculation I need to do to create a perfect air box, air flow, volume pressure, etc...?


Thanks for your help

Jack

[Jack&MLE]

The problem is using the Earth as my air box, is that it won't fit under the bonet

[jack&mle]

Thanks Gentlemen for your input

What I did not mention at the beginning is the VVC will be fitted with DTH TB.
This is why I need an air box.

The TBs are from a Exige.

I have an air-box from an Exige which will need to be severely modified to fit under the bonnet.

As I will be looking for torque rather than top end power, then from my understanding and believing the air box was design for top end power for the Exige (?) , if I reduce the volume of it would not matter too much.

Do someone knows the volume of an airbox form an Exige?

Thank a lot for your input

Jack