An effort to consolidate and means to navigate, this bit of info is pulled from the 05-18-2019, 10:05 AM post of this thread and pertains to the best location for the IFR.
Quote:
Originally Posted by Tom Vaught
The best location for the IFR (Idle Feed Restriction) was identified in carburetors and the results reported in NACA REPORT #49 (Part II on page 607) See link below.
http://naca.central.cranfield.ac.uk/...-report-49.pdf
In the conclusions part of the document, conclusion #4 clearly states that:
"Submerged Fuel Metering Passages (IFRs) are free from Instability and Irregularity of discharge when the head is very small."
You can not have a submerged Fuel Metering Passage when the IFR is in the "HIGH" Position, (only the "LOW Position").
There are 10 other conclusions and all of them are correct.
Many Carb Tuners have converted back to the Low Position IFRs even though the Holley Carb came stock with the High Position IFRs.
Hope this helps.
Tom V.
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Again, Much Thanks Tom,
Frank
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