Re: Jet Sizes????????

Posted by H. L. Chauvin on May 15, 1998 at 23:17:13

In Reply to: Jet Sizes????????
posted by Steve Watrous on May 15, 1998 at 19:50:00

: I know that one or more of you out there can tell me how to convert the numbers stamped on zenith jets to diameters, either in inches or millimeters (even furlongs).I'm desperate to find this info.
: Best Regards,
: Steve
Hi Steve,
1.The numbers on the jets are the carburetor partsnumbers as listed in the index of the book:"Model A Ford Service Bulletins, Complete". The jet part numbers changed in March 1930, (indicated on page 443), from jet part numbers previously indicated for January 28, 1928, page 208.Idling jet no. 10 became 11, compensator jet no. 18 became 19 etc.
2.The drill size numbers:#65, #75, etc., for checking nozzle sizes are drill size numbers measured in wire gage.(Just like shotguns, the higher the gage number, the smaller the bore;& the higher the drill sizenumber, the smaller the diameter of the drill;hence, the smaller the jet nozzle.
3.Drill sizes are given in inches and mm as follows:
No. 61 = .0390" = .9906mm
No. 62 = .0380" = .9652mm
No. 63 = .0370" = .9398mm
No. 64 = .0360" = .9144mm
No. 65 = .0350" = .8890mm
No. 66 = .0330" = .8382mm
No. 67 = .0320" = .8128mm
1/32"= .0312" = .7925mm
No. 68 = .0310" = .7874mm
No. 69 = .0292" = .7477mm
No. 70 = .0280" = .7112mm
No. 71 = .0260" = .6604mm
No. 72 = .0250" = .6350mm
No. 73 = .0240" = .6096mm
No. 74 = .0225" = .5715mm
No. 75 = .0210" = .5334mm
No. 76 = .0200" = .5080mm
4. The part numbers are directly related to the size ofthe nozzles.If one multiplies the part number byapproximately .00185 it equals the diameter of thenozzle.
Hope this helps, Best wishes, Henry

Follow Ups:
Re: Buying Drills, Small Parts, etc. H. L. Chauvin May 17, 1998 at 14:50:02(0)

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