autolite 2100???

does anyone know the CFM's of the 1.08 and the 1.23 autolite 2V's.Or even a website with the specs??
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http://www.homestead.com/1970mach1/3512VC.html

left one is 1.08
right one is 1.23.quite a difference.The 1.08 came off a 69 302,1.23 is off i think a 68 390,tag##C8TF-AZ.
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I'm going to ask a dumb question,where are you guys getting the numbers for these carbs?For example where did you get the 1.08?Is that the size of the butterflies or something?[img]/phpBB/images/smiles/icon_confused.gif[/img]

Venturi bore i assume?

The 1.23 is the venturi size,TR is truck.The date code is on the foot(8T AZ).There was also a 1.33 that was in 66 only.This one is going in the ACID tank

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<font size=-1>[ This Message was edited by: 64 TBOLT on 10/25/02 5:06pm ]</font>

According to the Ford Carburetor Guide from Pony Carburetors, flow figures for the Autolite 2100 carbs are as follows:
.98 venturi = 190cfm
1.01 = 245
1.02 = 240
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424

<font size=-1>[ This Message was edited by: secport on 10/26/02 5:25am ]</font>

<font size=-1>[ This Message was edited by: secport on 10/27/02 5:10am ]</font>

the info i found says
1.08=450
1.14=520
1.21=575
Guess i'll have to flow them to find out for sure[img]/phpBB/images/smiles/icon_confused.gif[/img]
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There are at least a couple of reasons why the info you have may be different.
1) Two barrels are typically rated at different vacuum levels than four barrels. Two barrels are rated at 3.0", four barrels at 1.5" (Hg)
2) The Autolite carbs have many common venturi sizes between the 4 barrel &amp; 2 barrel models. According to the carb guide from Pony Carburetors the 4v carbs flow as follows:
1.08" venturi = 480 cfm
1.12" = 600
1.19" = 669

I don't know exactly how Pony came up with their data. According to H.P. Books' Holley Carburetors &amp; Manifolds, the conversion figure between 2 &amp; 4 barrel carbs is as follows:

CFM flow at 3" Hg/1.414 = equivalent flow at 1.5" Hg

According to this calculation, a 1.08" venturi Autolite 4100 would flow only 405 cfm, based on the flow for a 1.08 venturi 2100. Maybe the only thing that makes any sense is to actually put the carbs on a flow bench &amp; see what happens, as you suggested.

<font size=-1>[ This Message was edited by: secport on 10/26/02 5:24am ]</font>

Thanks for the pics 64T-bolt,you learn something new everyday[img]/phpBB/images/smiles/icon_biggrin.gif[/img]