One thing, the jets(Fuel passages) need about 104% increase in area. Never drill, use a reamer! Area equals pi R squared. A lot depends on what carburetor you're using. The Mac 91 carb (intended for gas) with some tweaks, could run 100% alcohol.Anyone on here know what to.do to blueprint a mikuni carb for methanol.
Using pz27 carbOne thing, the jets(Fuel passages) need about 104% increase in area. Never drill, use a reamer! Area equals pi R squared. A lot depends on what carburetor you're using. The Mac 91 carb (intended for gas) with some tweaks, could run 100% alcohol.
Clear something up for me, when you say twice the size, what does that mean exactly? Twice the diameter or twice the area?I'm going to assume you're talking about a Mikuni round slide? I've dabbled slightly with running methanol through a Mikuni, but I'm still on the beginning edge of the learning curve. I started with putting a main jet in it twice the size as what came in it, being that it takes roughly twice as much methanol as it does gasoline for the same engine. To be honest, I don't remember now where I ended up with jetting, but
I have no idea. I'm just going by the numbering system on Mikuni main jets. I believe my carb came with a 130 main jet, so I put a 260 in it to start with running methanol. I've been told that with Mikuni jets, going to double the number size flows twice as much fuel, so based on that I would assume it's twice the area.Clear something up for me, when you say twice the size, what does that mean exactly? Twice the diameter or twice the area?
I'm lost. 130?? 260?? What are those numbers?Just for reference a Mikuni 130 main jet is .040 and a 260 main is .055. These are inch measurements
This is the arbitrary and rather annoying numbering system Mikuni uses for their jet sizes. It’s as dumb and inconvenient as it sounds.I'm lost. 130?? 260?? What are those numbers?
The numbers now make sense. Actually the starting point for going from gas to methanol from a .040 jet, would be .05656. or a .056 or. 057Just for reference a Mikuni 130 main jet is .040 and a 260 main is .055. These are inch measurements.
fat fingers an decimal points . Or mm and decimals .The numbers now make sense. Actually the starting point for going from gas to methanol from a .040 jet, would be .005656.
And going from a 36 gas jet would be .509 or a .51 jet
If my calculations are correct?
Thank you for pointing out my error. I have now corrected the mistakes. with the floating decimal point.
fat fingers an decimal points . Or mm and decimals .
I'm totally confused now !
Al, I was told the the 3 digit numbers on mikuni jets were flow numbers. I ended up buying a bunch of different sizes and sitting down with my pin gauge set and measuring them.I'm lost. 130?? 260?? What are those numbers?