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Ford 9N, 2N & 8N Discussion Forum
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thank you

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Author 
ron,ar

10-22-2006 00:28:51




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The real problem as I see it is that this "bowl vent" is percieved as a simple air passage as almost just an opening in the upper carb bowl. I keep referring to this as "the elusive bowl vent" because I have asked several times since June for a good picture/drawing and you can see how many different opinions/ ideas have been posted. My only consolation is that I am obviously not the only one having problems with this air passage. Lately I have seen a couple of cross section drawings of this "vent". It does far more than just allow the air out of the top of the float bowl as fuel enters but that is the part that causes the greatest problems in the main jet circuit. Drilling a hole in the top only helps, but does not cure the problem (or symptom) of a stumble when at full throttle, with a seemingly "unadjustable" main jet screw. Most of the time it causes the main jet adjusting screw to have to be screwed almost all the way to run at full throttle. Most folks think because they vat the carb, blow it out good and air comes out "SOMEWHERE" from each orfice that all passages are open. As you have stated, that circuit is a little more complex than "air in-air out". Another problem stems from the use of terms. Low speed jet/high speed jet, fast idle adjusting needle/ high speed needle/main adjusting needle, idle mixture screw/main mixture screw etc. etc. These terms are all used interchangably in different publications. Heck, only the people on these pages understand what you mean when you say "backward acting idle mixture screw:^) And to complicate matters more are manufacturers terms...I have seen several governors and their accompaning literature refer to "low idle" and "high idle" adjustments. Some of us know the difference but too many people equate the term "IDLE" to low speed only. I am looking forward to your photos, and again, thank you for your help/advice.

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