sredish Posted June 28, 2004 Report Share Posted June 28, 2004 I'm going to experiment with a spare main jet I have. I want to drill it out, but I want to incrementally go up from the 230 jet. Anyone know where on the net you could find the inside diamater sizes for the jets? I'll call carbparts.com tomorrow, but they're closed now, maybe someone knows where to find them online. later. Quote Link to comment Share on other sites More sharing options...
brock_fuzzy_69 Posted June 28, 2004 Report Share Posted June 28, 2004 i know that the jet size is related to a metric unit of area times a fixed number not sure exactly what it is tho but u could takr the desired jet size divided by the constant number and you use that number to calculate the dia now that you know the area wish i knew more about it for ya be careful to drill a jet only a few sizes larger as not to interupt the funnel shape of the jet opening a nice set of jet drills is usually available from holley or NOS the nitrous company (wich is owned by holley) Quote Link to comment Share on other sites More sharing options...
sredish Posted June 29, 2004 Author Report Share Posted June 29, 2004 be careful to drill a jet only a few sizes larger as not to interupt the funnel shape of the jet opening a nice set of jet drills is usually available from holley or NOS the nitrous company (wich is owned by holley) Thanks, that's a great idea, never thought of that. Quote Link to comment Share on other sites More sharing options...
brock_fuzzy_69 Posted June 30, 2004 Report Share Posted June 30, 2004 i think that if you coudl find out the size of a few dif jets hole DIA then u coudl calculate the area and then find ou what the constant number is or sorta make you own using the jet drills find the dia of the hole of the jet in american units if you wish calculate the area in square inches and that should relate to the main jet number so if you made a spreasheet of dif main jet numbers and there known hole diamters and the calculated area of each one there should be pattern the jet number divided by the area shoudl equal about the same every time Quote Link to comment Share on other sites More sharing options...
brock_fuzzy_69 Posted June 30, 2004 Report Share Posted June 30, 2004 jets............... Quote Link to comment Share on other sites More sharing options...
J..J. Posted June 30, 2004 Report Share Posted June 30, 2004 (edited) Brock is right, Mikuni uses flowrate in cc's per minute, so it is obvious then that the relationship between jet diameter and flow rate is not linear. (A jet with a diameter of 2x another does not flow 2x the amount of fuel.) You have to establish the relationship between the area and the flowrate, (either a graph or spreadsheet) and then work backwards to get the diameter for a specific flow rate. Also like Brock said, don't mess up the hollow at the non-threaded end of the jet. That drill kit looks the bee's knees, I'd love to have that in my gargage. Sredish, I'm quite keen to see how it turns out... Edited June 30, 2004 by J..J. Quote Link to comment Share on other sites More sharing options...
MotulMonsta Posted July 1, 2004 Report Share Posted July 1, 2004 I guess they don't make the size jet you need? I'm shure that drill kit retails for far more then a handfull of jets would. I've know people who would drill out their own jets with a regular drill just to save a few bucks..I think they had pretty good sucess but they didn't use any mathmatical formulas nor graph their variables on spreadsheets, they just eyeballed it and drilled away. Quote Link to comment Share on other sites More sharing options...
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