flow testing Model A Zenith carb jets

[60ch]

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.

[Gary WA]

Originally Posted by 60ch

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.

[Kevin in NJ]

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.

[JD 1931]

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

[redmodelt]

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.

[mercman from oz]

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Technical Note on Flow-Testing - Gary WA