2/13/2024 0 Comments Drill bit jet size chart![]() 1/2 of what was in the "source" container. If both jets have the same flow rate, then both "capture" containers will contain exactly the same amount of fluid, i.e. Place 2 containers to capture flow thru the jets. The "common" side of Y goes to a source container of fluid. Connect a reference jet to the left side of an upside-down Y fitting, and a custom jet to the right side. Recalibrating with a known jet every time should eliminate the viscosity variable, and using a large volume of fluid should improve "head" accuracy.Ī more convenient variation on the same theme is to build a "fluid divider" as follows. volume and height above orifice), as well as on viscosity, so you will have to hold those 2 things as consistent as possible. Flow rate depends on "head" of fluid (i.e. Repeat the same with your custom-drilled jet, and calculate flow ratio from there. water) and let it drip till empty thru a known-sized jet and measure the time it took. So couldn't you just measure flow rate of your custom-drilled jet by comparing it to the rate you measure thru a known "reference" jet?įor example, fill a container with 1 liter of fluid (e.g. as much as you care about actual flow rate. It occurs to me that you don't really care about jet I.D. If you made the hole too big, then you would heat up the brass jet and fill it with a drop of solder, and start over again. you twirl that contraption with your fingers. Drilling jets was done strictly by hand, i.e. You could buy a kit at an auto parts store which had a few brass jets and an assortment of drills along with a handle that had a chuck on the end of it. Not to mention the fact that it is pretty difficult for most of us to accurately measure a hole this small.ĭrilling jets is a tough road unless you have a ton of time to test every single jet you modify and document it's characteristics.Īn old timer pro engine tuner told me that drilling your own jets used to be common practice back in the 70's. With flow rates this small it doesn't take much in the way of an internal flaw to effect the variances we are talking about. It's been my experience that quality jets are marked pretty accurately in terms of the physical dimensions, and the differences in bulk flow can just as often come from the manufacturing process. Good jets can vary as much as 5% cheap jets can be closer to 10% variance even when marked with the same jet number. 0008" (I'll let those so inclined do the math to determine the flow difference). Keihn jets are numbered by jet id, and the difference between a 178 and a 180 is about. The flow difference between a Mikuni 175 hex jet and a 180 is about 6cc ~3%). Mikuni hex head jets are numbered by bulk flow, while Mikuni round head jets and Keihn jets are numbered by inner diameter in mm.
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