Quote:
Originally Posted by 1001001
No expert here, but I i would think that it was a balancing act. The absolute orifice sizes would be less important than the relative change in size between the richer and leaner cylinders while maintaining total flow at a constant pressure drop.
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Very much agree. Diesel orifices are much the same. For example, an abrasive slurry, (looks and acts like silly putty) is pushed through the nozzles to radius the inlet to each orifice. Delivery by each orifice is then stabilized to it's diameter.
Although our systems are much lower pressure, the same principles apply. Flow variations due to micron sized manufacturing differences certainly exist, and overpower the direct link to diameter unless a similar (expensive) process was/is used.
Disclaimer: I have no personal knowledge of the manufacturing processing of the orifices for our aircraft engines. If someone does, please add to our knowledge.