This thread is to explain why 99% of US nitrous products cause UNEVEN distribution.
So we'll start with parts like rails, spray bar plates, slab type distribution blocks as sold by the likes of NX & others, all of which have an entry at one end, with exits down the sides that are positioned at rights angles to the entry axis and a blanked end.
To make this easier to understand;
1) Remember nitrous oxide is made up of molecules which have MASS
2) When anything with mass is travelling at speed it has INERTIA, which means it doesn't like to be stopped.
3) Think of nitrous flow as a bus (or train) with doors at the front, packed full of standing people driving down a dead end street.
So the bus packed full of people is charging down the road at 1,000 MPH (psi), so it flies past the first, second, third etc. drop off points before it crashes in to the end of the street, causing all the people to pile forward (due to their MASS being acted on by INERTIA) and break out of the front doors.
In nitrous terms this equates to the nitrous flowing into the tube at 1,000 psi flowing past the exits nearest to the entry and then crashing into the blanked end of the block, spray bar or rail, before flowing out of the exits nearest to the blanked end.
Unlike the bus example which has a limited number of people (molecules), the nitrous keeps feeding molecules into the tube and as a result the nitrous fills the tube and progressively flows from each of the exits, until it's flowing from all of them. However, although there is flow from all the exits, the inertia still affects the flow and as a consequence, most flows from the exit furthest from the entry and least flows from the exit nearest to it, as shown in the diagram below.
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To make matters worse with spray bar plates;
1) They feed the fuel and nitrous from opposite ends and although the nitrous issues aren't quit as applicable to the fuel side, the same effects do still have some effect, which means the cylinders that get most nitrous get least fuel, which is why cylinders nearest the back of the engine are most likely to suffer a meltdown.
2) They add multiple bars/stages and the only thing worse than one spray bar is multiple bars.
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The only thing worse than multiple bars is having the bars at 90 degrees to each other, as that can only screw up the whole distribution deal
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I hate to think how bad the distribution is on this one;
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Putting 2 bars on each side of the plate can't improve matters (and almost certainly makes them worse) but plumbing such a plate as shown below, is GUARANTEED to cause distribution problems, as the spray bar that is supplied by the 2nd leg of the dual outlet feed tube, will get more than the first one, for the reasons given above;
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The same principles apply to distribution blocks as shown below;
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But once again some people can make even a bad design worse, as shown in the following 2 examples.
Adding an elbow introduces another factor (centrifugal force), that has an adverse effect on distribution;
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Putting all exits on the same side and feeding the fuel and nitrous from opposite ends, causes double trouble;
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More info to follow.
we put 'S' bends in our pipe work, to overcome the effects of centrifugal force, in a shorter distance, as it's not always possible to have 4 inches of straight pipe in some locations on some applications.
has posted to my technical posts.