... and try cutting it down in length bit by bit. Or just have one short and one long for A-B testing.
What you are doing is just making the far end of the straw a LARGE diameter to make an extreme example of what a bigger diameter pipe does together with a smaller diameter section.
As Dan explains above there is more friction in the smaller pipe making the air move slower. You would need suck harder to get the same amount of air. However if you are a fly you get all the air you would ever need through the thin long straw so you would never see a difference going bigger or wider.Think about this also. In serious ICE setups its not uncommon to use 1/0 gauge wire which is capable of supporting serious amounts of current, right? Now what do they always install (or rather SHOULD always install) pretty close to the battery? A fuse. And what is the diameter of that fuse? Pretty small, right? So is there really a point to use that big 1/0 gauge wire in the first place when the current have to go through that small section of wire (the fuse) anyways? Sure. Because that is a pretty short length of restriction. Also when choosing the gauge size for your ICE wiring you should consider your LENGHT of wire needed for your specific install and your current needs. You might get away with a 4 gauge wire if the stretch is short enough and still get the same amount of current through than a length 5 times as long running the 1/0 gauge wire (numbers out of thin air). Of course depending on your current needs. This because a longer wire results in more voltage drop the more current you push through it. Or "friction" if you will to compare it to the air piping examples.
Find a voltagedrop calculator online and have a play with it to see the effects.
Actually here is one Try 1 meter vs 50 meters at 200 amps and see the differense. Or vary the gauge but keep the lenght which is more relevant in our case https://www.calculator.net/voltage-drop-calculator.html
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06:55:14 10/02/20
