Re: Drilling Zenith Carburetor Jets

Posted by Mike Flanagan on December 02, 1997 at 22:40:21

In Reply to: Re: Drilling Zenith Carburetor Jets
posted by Greg Weast on November 30, 1997 at 23:20:03

Gordon, I have built a "jig" which I use for many different things including redrilling the soldered jets from the Zenith carb. The jig consists of a piece of steel angle about 3' long into which I have drilled holes until it resembles a piece of swiss cheese. Some of these holes are tapped to accept the jets. I screw the jets into the angle (which by the way is securred in the bench vise) and clamp a hand rest onto the angle located strategically. To drill I use a set of Oxygen/acet tip drills and a Dremel tool with a chuck attachment. A scratch awl provides a starting point and the Dremel does the rest. I usually get it right the first time but occasionally have to resolder and try again.

God Speed Under 50.

The Model A Fool.

: : First, a thanks to Bob Carabbio for his input on the rebuilding of Model "A" transmissions.

: : I have built a flow tester for testing the output of the various jets used in the Zenith carburetor.Most of mine are running somewhat on the rich side.Most articles on this subject only allude briefly to the technique employed in the soldering and drilling of the jets in order to resize them.

: : I have a set of the smaller drill bits that can be used for this purpose.I could use some input on what drilling techniques have proved the most satisfactory (i.e., without enlarging the opening in the orifice).I remember reading somewhere that if one uses some stainless steel wire (.020"; hobby shop?), that this technique can be of value because solder will not adhere to stainless steel, thereby leaving a .020" opening from which to start once the soldering is completed.

: : Others have suggested mounting the jet itself in a drill, rotating it at a slow speed to minimize wobble, and then using a pin vice to hold the bit in question, which is then brought into contact with the jet by hand.Somehow, I would think that it would be difficult to hold one's hand sufficiently steady for this technique to be effective.

: : I would appreciate any thoughts from those who have gone through this drill already!

: : Thanks.

: : Gordon Biggar
: : Houston Model "A" Club

: Gordon,

: I'm no expert on A's or carbs, but your thought that solder doesn't stick to stainless didn't sound right.So down to my shop I go and I proceeded to solder .025 stainless wire just as well as copper!

: Best of luck,

: Greg Weast




Previous PageE-Mail Comment to WebmasterPost New MessagePrint MessageClose Window

© 1996-2010, Ahooga.Com

Anti Spam