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06-09-2023, 05:38 PM | #21 |
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Join Date: Feb 2013
Location: MICHIGAN
Posts: 38
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Re: Buy flow tested carburetor jets?
Flow rates are what matter, not the hole size.... not all holes are created equal
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06-09-2023, 07:51 PM | #22 |
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Re: Buy flow tested carburetor jets?
I had a cheap engineer boss that was a mpg nut. He bought a new Toyota for almost 30 grand because it got excellent mileage. I pointed out his old 20 mpg car could go about 170,000 miles on $3.50 a gallon gas for what he just spent.
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06-09-2023, 07:55 PM | #23 |
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Join Date: May 2010
Location: Young Harris, GA
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Re: Buy flow tested carburetor jets?
The original Ford blueprints actually quote the water flow rate range that they want through each jet under specific conditions. It is very cool.
Of course, in order to give the machinists a number to drill the tip of the jet to, they specify both a drill number and a hole size range, but that was not the spec. Example below for the Model A Zenith Main Jet. Note the 90 degree conical finish of the tip. BTW, compare to the hole size quoted for the Main Jet in the earlier post.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
06-10-2023, 11:06 PM | #24 |
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Location: Wa.
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Re: Buy flow tested carburetor jets?
What ever happened to final testing with an AFR gauge?
I have seen cases where the final size was 2 notches from recommended. |
06-11-2023, 04:25 PM | #25 |
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Join Date: Aug 2016
Location: West Virginia
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Re: Buy flow tested carburetor jets?
I rigged up a simple test rig with pvc pipe fittings and flow tested new jets from a kit and originals. I think only two were within acceptable tolerances. I soldered the rest and resized with proper wire gauge drill and re-tested.
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06-12-2023, 06:53 AM | #26 |
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Re: Buy flow tested carburetor jets?
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Cap jet- 170 ml./min. Main jet- 160 ml./min. Idle jet- 57 ml./min. Compensator jet- 150 ml./min. Cap, main, and compensator jets are all "in the ball park". The idle jet is a bit high, according to flow literature I have. Next, I installed them as is in a Zenith and tried it on a car. Good idle, good throttle response, easy starting, etc. Very happy with these jets. I also flow tested some old repro jets and they were all over the board. Some high, some low. These would need to be redrilled, soldered before installing in a carburetor. My experience. |
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