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Old 12-01-2021, 03:21 PM   #1
60ch
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Default flow testing Model A Zenith carb jets

Can anyone explain the reason for flow testing Model A Zenith carb jets with a 36 inch water column instead of the 37 1/4inch column as used by Ford? Thank you.
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Old 12-01-2021, 08:12 PM   #2
Gary WA
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Default Re: flow testing Model A Zenith carb jets

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Originally Posted by 60ch View Post
Can anyone explain the reason for flow testing Model A Zenith carb jets with a 36 inch water column instead of the 37 1/4inch column as used by Ford? Thank you.
here u go.
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Old 12-02-2021, 08:22 AM   #3
Kevin in NJ
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Default Re: flow testing Model A Zenith carb jets

Here are some charts to make life easy.

http://www.fordgarage.com/pages/jetflowrates.htm

I tested many jets using the Ford column length.

I did a lot of error checking and repeating and found the results were very consistant.

Most seemed to flow too much by a little to a lot and some were on the money. A few did not have a nice stream indicating there was a problem with the hole and flow.
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Old 12-02-2021, 06:19 PM   #4
JD 1931
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Default Re: flow testing Model A Zenith carb jets

I have rebuilt and sold over 200 model A zenith carbs and have always gone by the drill size for all the jets...Merry Christmas
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Old 12-04-2021, 02:39 PM   #5
redmodelt
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Default Re: flow testing Model A Zenith carb jets

One thing I have seen someplace is; when soldering the hole up to resize, how thick the solder is before you redrill the hole can change the rate of the flow. So if it calls for X size hole, might have to go to larger or smaller drill to get the correct flow.
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Old 12-04-2021, 05:02 PM   #6
mercman from oz
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Default Re: flow testing Model A Zenith carb jets

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Technical Note on Flow-Testing - Gary WA
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