Holes in air boxes
Posted: 12 Feb 2018 10:54
This comes from a Whatsap group discussion with some friends.
The factory air-box from the ZD30 (and probably others as well, i haven't looked) has a 4mm hole in the bottom, outside the filter.
The questions are what it's for and what disadvantages it may have, especially regarding fording.
My opinion is that the main advantage is to let out water and dust. Air always has some water in it. How much depends on atmospheric conditions.
This water will be shed under certain conditions, but typically will only cause issues if the water is not absorbed in the air. Under heavy rain, this can happen. The faster air moves, the more water it will carry.
The area in the air box where the hole is, is also the area where air velocities are lowest, and thus where the most water will "drop out". Also, any water swirling around in here will tend do drag whatever dust is lying on the bottom with it.
As far as wading is concerned, i doubt enough water can enter through such a small hole to cause engine damage as long as the engine is running. And if you stall the engine during the crossing, the exhaust is much more of a problem.
However, if one is really concerned, it's easy enough just to plug it temporarily with duct tape or prestic.
The factory air-box from the ZD30 (and probably others as well, i haven't looked) has a 4mm hole in the bottom, outside the filter.
The questions are what it's for and what disadvantages it may have, especially regarding fording.
My opinion is that the main advantage is to let out water and dust. Air always has some water in it. How much depends on atmospheric conditions.
This water will be shed under certain conditions, but typically will only cause issues if the water is not absorbed in the air. Under heavy rain, this can happen. The faster air moves, the more water it will carry.
The area in the air box where the hole is, is also the area where air velocities are lowest, and thus where the most water will "drop out". Also, any water swirling around in here will tend do drag whatever dust is lying on the bottom with it.
As far as wading is concerned, i doubt enough water can enter through such a small hole to cause engine damage as long as the engine is running. And if you stall the engine during the crossing, the exhaust is much more of a problem.
However, if one is really concerned, it's easy enough just to plug it temporarily with duct tape or prestic.