Fogger 'TYPE' nozzle plume on the left Vs Crossfire plume on the rightWhich one do you think is going to give a more even distribution in a single point system, where it is essential to spread it about rather than aim it all down one cylinder????
There are a number of reason why most US nozzles don't work as well as Crossfire’s and
in particular in single point systems;
1) On a well made type of US brand injector/nozzle the fuel is drawn inside the conical plume of nitrous. The inside of the cone is the coldest section of the plume, as the outer sections start drawing heat as soon as the nitrous enters the intake system. The central core of the plume is trying to expand INWARDS, therefore it can only draw heat from the fuel, which makes the fuel more dense (rather than less dense), when what we really need is for the fuel to be atomised. Also as the nitrous tries to expand it can only do so by squashing the fuel (again making it more dense). Being colder and compressed it restricts the movement of the atoms and unless the fuel molecules can expand or be blown to bits, the fuel won’t be atomised very well (if at all).
2) On a badly made nozzle the fuel doesn't get to the centre but that's even worse, because it only makes contact with a small amount of the nitrous and because it's not caught inside the plume it drops onto the manifold wall, rather than being delivered with the nitrous. There is little to no atomisation and a reduced amount of fuel delivered to the engine as a consequence, resulting in lean outs and backfire explosions.
3) With most US nozzles the nitrous plume exits as a very narrow, extremely strong UNIDIRECTIONAL cone shape, with the nitrous ONLY on the outer perimeter, which means that uneven distribution is UNAVOIDABLE. In most instances the extremely strong unidirectional nature of the plume, results in most nitrous and fuel being fed to the furthest cylinder and overdosing it, whilst feeding very little to the other cylinders. Furthermore, as the nitrous/fuel plume passes each of the cylinder intakes, SOME of the nitrous ONLY (in the outer of the plume), is drawn in to those cylinders, causing those to run lean.
In contrast to all the above issues related to US nozzles, the WON Crossfire;
1) Has a UNIQUE WIDE FAN shaped plume that spreads the nitrous and fuel delivery over a wider area.
2) The lack of a cone shaped plume results in the fuel being mixed more evenly with the nitrous as there is NO core vacuum effect for the fuel to be pulled into.
3) The method of creating the fan shape plume, GREATLY REDUCES the extremely strong unidirectional force, that a 1,000 psi nitrous plume normally has as it exits ALL US type nozzles.
4) The combined benefits of all the above design features results in a far more even distribution of fuel and nitrous.
Here are some drawings that represent the plumes from the 2 different types of nozzles;
1) ANY US brand Fogger type nozzle
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2) The distribution from using such a nozzle in a typical 4 cylinder manifold
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3) Our UNIQUE Crossfire injector
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4) The distribution from using the Crossfire in a typical 4 cylinder manifold
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plumeshapewon2.png [ 25.79 KiB | Viewed 48425 times ]
There's no wonder that the likes of Vipers have problems with single US nozzle (per bank) and why our customer Jack is doing very well with a Crossfire per bank.