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Rate Shaping Nozzle, RSN® Injectors

The Stanadyne Rate Shaping Nozzle is a unique approach to providing fuel injection rate shaping for direct injection engines. In contrast to two stage injectors and other more costly methods that have been used for this purpose, the RSN injector offers a greatly simplified and more compact alternative.

The RSN accomplishes the fuel flow throttling necessary for injection rate control by hydraulic regulation of a throttling area preceding the spray holes. This eliminates the need for two springs and associated hardware without affecting injector size or capability.

Evaluations performed have shown that engine performance with RSN® injectors can be equivalent to that with more complex two spring injectors. An application optimization program is necessary to achieve maximum engine benefit.


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