Today a bit more on Holley Carb calibrations.
The formulas are basic area equations.
Diameter divided by 2 = Radius of hole
Radius of hole times Radius of hole times (PI or 3.14159) =area
2 Jets so area times 2 equals total area for Primary Circuit, Secondary Circuit, or Power Valve Circuit.
Three equations are below:
Calculation #1
#80 Primary Jets = 0.093" Diameter
0.093" DIVIDED BY 2 = 0.047"
0.047" X 0.047" X 3.141592654 = 0.006793"
Two Jets = 0.0135858 square inches of flow area
Calculation #2
#86 Secondary Jets = 0.101" Diameter
0.101" DIVIDED BY 2 = 0.051"
0.051" X 0.051" X 3.141592654 = 0.008012"
Two Jets = 0.016024 square inches of flow area
Calculation #3
.059 PVCR Restrictions = 0.059"
0.059" DIVIDED BY 2 = (call it .030" for easy math).
0.030 X 0.030 X 3.141592654 = 0.002734
Two PVCRs = 0.002734 + 002734 = 0.005468 square inches of flow area
Using these basic calculations, it you determine that you need to increase the fuel area by "x " percentage you multiply that percentage by each of the calculations above and get a new flow area and diameter and add the new jetting or PVCR diameter to your carb.
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
Last edited by Tom Vaught; 02-08-2018 at 06:25 PM.
|