Terry Syd
Pinnacle OPE Member
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Here's the best visual representation I've seen of the pressure differentials in the venturi of a carb. If you take a look at the diagrams you can see how moving the nozzle either further in or out will affect the 'signal' on the discharge nozzle.
http://ethesis.nitrkl.ac.in/2296/1/final_report.pdf
We can't change the angle of the nozzle, however we can change the length of the nozzle to get a different fuel curve for the carb. For example, in a carb with the nozzle entering vertictal at the mid-section of the venturi, if the nozzle is moved out to the edge of the venturi the fuel flow will start at a lower air flow rate. Conversely, if we move the nozzle inward, the fuel flow will start at a higher air flow rate.
Just one more trick to carb tuning.
EDIT: I just noticed I misspelled nozzle in the title to the thread. I know how to edit a post, but how do I edit the title?
http://ethesis.nitrkl.ac.in/2296/1/final_report.pdf
We can't change the angle of the nozzle, however we can change the length of the nozzle to get a different fuel curve for the carb. For example, in a carb with the nozzle entering vertictal at the mid-section of the venturi, if the nozzle is moved out to the edge of the venturi the fuel flow will start at a lower air flow rate. Conversely, if we move the nozzle inward, the fuel flow will start at a higher air flow rate.
Just one more trick to carb tuning.
EDIT: I just noticed I misspelled nozzle in the title to the thread. I know how to edit a post, but how do I edit the title?
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