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| Holley #1920 https://www.slantsix.org/forum/viewtopic.php?t=2700 |
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| Author: | Dan [ Mon Sep 24, 2001 5:27 am ] |
| Post subject: | Holley #1920 |
Can anyone tell me the cfm of the Holley # 1920 carb? reptylkrib@aol.com |
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| Author: | Craig [ Mon Sep 24, 2001 6:50 am ] |
| Post subject: | Re: Holley Carburetor flow ratings CFM |
According to information in a book, Holley Carburetors & Manifolds, that I have. . . The 1920 carb came in flow capacities of 160 and 235 CFM (flow at 3.0 inches Hg). Throttle bores are 1-9/16 and 1-11/16 inch. The 1945 carb came in one size wilth a 1-11/16-inch throttle bore and flows 203 CFM at 3.0-inch Hg pressure drop. (Hg is the chemical symbol for mercury. Most vacuum gauges we use here are calibrated to read in "Inches of Hg" meaning "inches of mercury".) NOTE - You can NOT directly compare CFM rating of 1- and 2-bbl carbs to ratings of 4-bbl carbs. 4-bbl carbs are usually rated at 1.5 inches Hg pressure drop whereas 1- and 2-bbl carbs are rated at 3 in. Hg pressure drop. To relate the two measurements, use the formula CFM flow at 3 in. Hg / 1.414 = Equivalent flow at 1.5 in. Hg Example: for a 235 CFM 1-bbl carb 235 / 1.414 = 166 CFM four-barrel equivalent Hope this helps. CF cfield@ll.net |
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| Author: | Dan [ Tue Sep 25, 2001 5:05 am ] |
| Post subject: | Re: Holley Carburetor flow ratings CFM |
Thanks, this is just what I needed to know! God bless America! Dan Quote:
: : According to information in a book, Holley : Carburetors & Manifolds, that I have. . : . : : The 1920 carb came in flow capacities of 160 : and 235 CFM (flow at 3.0 inches Hg). : Throttle bores are 1-9/16 and 1-11/16 inch. : : The 1945 carb came in one size wilth a : 1-11/16-inch throttle bore and flows 203 CFM : at 3.0-inch Hg pressure drop. : : (Hg is the chemical symbol for mercury. Most : vacuum gauges we use here are calibrated to : read in "Inches of Hg" meaning : "inches of mercury".) : : NOTE - You can NOT directly compare CFM rating : of 1- and 2-bbl carbs to ratings of 4-bbl : carbs. 4-bbl carbs are usually rated at 1.5 : inches Hg pressure drop whereas 1- and 2-bbl : carbs are rated at 3 in. Hg pressure drop. : : To relate the two measurements, use the formula : : CFM flow at 3 in. Hg / 1.414 = Equivalent flow : at 1.5 in. Hg : : Example: for a 235 CFM 1-bbl carb : : 235 / 1.414 = 166 CFM four-barrel equivalent : : Hope this helps. : CF reptylkrib@aol.com |
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