reatrdedspleen

it seems that actuly making a lid for the cool air box would be better? correct me if im wrong.

Nick86 this weekend im going to be making the exact same type of box you are most likly with 3'' or 4'' PVC pipe. prolly going to use a funnel on the front of the PVC, hoping for a ram-air type of thing.


If you were to seal the box with a lid, then you wouldnt pull in ANY engine air. But would there be an issue with not getting enough air at idle? Do you think it would suck enough air in through the tube?

also, the small filter for the air pump. is it recomended i route that so it also gets cold air? or does it matter?

NZConvertible

Maybe in some fantasy land where the car is constantly moving at 100mph that might work, but here in the real world you couldn't be more wrong. Even with a very effective ram air intake, most of the time the engine is sucking more air in than is being pushed in by whatever outside air intake you have. The excess air you mentioned is being sucked in, not pushed out. Unless you have a totally sealed airbox or heat shield, that excess air is coming from the engine bay. Air always follows the path of least resistance, so the way to make these systems effective is to make it much easier for air to be sucked into the filter from outside than from the engine bay.

carbon man

To make a cold air itake work there is 3 main things to look at.
1- get air as cold as possible
2- get smooth unturbulated air
3- get as high air pressure as possible

So you need to get air from somewhere before it has been heated by radiators, exhaust pipes and engine parts, you need to watch the material you make your air intake from as you don't want it to heat the air. (alluminium is NOT a good material to make a air intake from)

You need to get the least amounts of turns it the air flow, the air cleaner is beter placed as far away from the intake as possible and you need the air to go UP through the air cleaner elemant and NOT down as down will block quickly. Be carfull of the size of the intake as it is beter to be large for the air flow is slower but the heat soak is a bigger problem the larger you go.

The higher the pressure you can get in the air box the better. You will not get better than half a PSI air pressure in your air box but that is better than a vacuum.

~ ian.