Kevin in NJ
Well-known member
Many moon ago I started building a carb jet flow rate tester.
I had some chunks of thin copper tubing and some attachments. I found a tube chime from a cheap grandfather clock in the trash. I liked the nice sharp edge at the one end so I knew I could be real exact on the length. PVC pipe did not seem a nice an edge to me.
Back then I set it up for a 36" column and never really used it.
So recently I dug it out. Set it up for the 37.25" Ford spec and printed out the stuff from Vince's website.
So as you can see in the picture it is not pretty like Tom makes stuff. The cup on top is one of the old sippy cups from my sons with some silicon glue to catch the overage. I jambed a fitting I had laying around and I had some clear tubing that just fit in the hole so it drains back down to the bucket. The wire hangar on the top was bent to one side to make the tube level because of the weight of stuff below. The pump is borrowed (with permission) from my neighbors fish pond. It has a hose the kind of fits in the hole and is wrapped with electrical tape to hold it in place and keep the water from spraying.
I have some regular 3/8" copper tubing at the 37.25" point. The ID is a bit big for the 5mm threads of the jets. I managed to get some solder in the pipe and tapped it the common 5mm X .80. The correct thread is 5 X .75, but good luck getting that one. In fact on the of cheapo china ones is advertised as 5 x .75, but they send a .80- so watch out. As it turns out the .80 is close enough and it is real soft anyway so it works fine for this.
So at this point I have done 3 different types of original jets. The NOS looking jet came in perfect the first time. The other 2 needed some cleaning. By cleaning I mean a bare wire about the right diameter just rubbed some. This usually cleans off the hard stuff with out changing the diameter. The 2 were off by around 5 ml low. When I cleaned and tried again they were mid range Ford specs.
I have to add that I do not have the correct size measuring cylinder. I have one that goes to 150ml and it goes by 10ml increments. I have ordered a 250ml by 1ml cylinder. When that one arrives I can look closer at the accuracy of my set up. Then I will work the 50 or so jets I have laying around.
I had some chunks of thin copper tubing and some attachments. I found a tube chime from a cheap grandfather clock in the trash. I liked the nice sharp edge at the one end so I knew I could be real exact on the length. PVC pipe did not seem a nice an edge to me.
Back then I set it up for a 36" column and never really used it.
So recently I dug it out. Set it up for the 37.25" Ford spec and printed out the stuff from Vince's website.
So as you can see in the picture it is not pretty like Tom makes stuff. The cup on top is one of the old sippy cups from my sons with some silicon glue to catch the overage. I jambed a fitting I had laying around and I had some clear tubing that just fit in the hole so it drains back down to the bucket. The wire hangar on the top was bent to one side to make the tube level because of the weight of stuff below. The pump is borrowed (with permission) from my neighbors fish pond. It has a hose the kind of fits in the hole and is wrapped with electrical tape to hold it in place and keep the water from spraying.
I have some regular 3/8" copper tubing at the 37.25" point. The ID is a bit big for the 5mm threads of the jets. I managed to get some solder in the pipe and tapped it the common 5mm X .80. The correct thread is 5 X .75, but good luck getting that one. In fact on the of cheapo china ones is advertised as 5 x .75, but they send a .80- so watch out. As it turns out the .80 is close enough and it is real soft anyway so it works fine for this.
So at this point I have done 3 different types of original jets. The NOS looking jet came in perfect the first time. The other 2 needed some cleaning. By cleaning I mean a bare wire about the right diameter just rubbed some. This usually cleans off the hard stuff with out changing the diameter. The 2 were off by around 5 ml low. When I cleaned and tried again they were mid range Ford specs.
I have to add that I do not have the correct size measuring cylinder. I have one that goes to 150ml and it goes by 10ml increments. I have ordered a 250ml by 1ml cylinder. When that one arrives I can look closer at the accuracy of my set up. Then I will work the 50 or so jets I have laying around.
