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Brennan Metcalf/Mieser runs a 2100 on his flatty Rango, swears by them and either has a list of off road mods, or sells stuff for them, I can't recall. Worth a conversation (he's easy to find on FB). Lots of info in the Rango thread too:On the wait for gas tank parts, I dove into the Motorcraft 2150 2bbl carburetor. Info from some jeep forums states this is a knockoff because of the circle cast on the side. The numbers 1.21 = 351 cfm. The measurement 1.21 is the diameter of the Venturi or open area above the throttle plates. This is a 2150 258 ci 2bbl carb which has a #52 jet dia hole. This is a lot of big air and gas for this motor, the plugs go black ass coal from just trying to start up this shit box! (rich)
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1.21 = 351 CFM is too large of a venturi. a 1.08 = 287 found in the 2100 Motorcraft carb is best suited for the 258ci.
Here's the breakdown for venturi size
venturi size is the number in a circle on side of carb.
here's a list of what = what
.98 = 190
1.01 = 240
1.02 = 245
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424
If you read the above and disagree please talk about it.
Just trying to start the motor and hear what it needs for repairs then decide the cost-effective next step.
A plan is to fill in the jet hole with a lead soldier and drill a smaller hole for less fuel and tape the Venturi with heating duct foil tape to reduce its size in an effort to get this motor to start. Would this make a difference?
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View attachment 6220
Right on Kunker, the link is about a good way to tune these carbs with a vacuum gauge and patients. The carb he is tuning is a 2100 at 1.08 dia venturi and a #47 jet.Brennan Metcalf/Mieser runs a 2100 on his flatty Rango, swears by them and either has a list of off road mods, or sells stuff for them, I can't recall. Worth a conversation (he's easy to find on FB). Lots of info in the Rango thread too:
Tonight I also got the carb back on the intake and did some retuning.... Lesson learned: If you have a vacuum leak, or even think you do, fix it! With the pesky vacuum leak eliminated under the carb, adapter, and intake I started to tune the carb in again. I am going old school and generally...www.pirate4x4.com
But it's been a while since I've dug through it.
Based on what carb experiments they've run on Engine Masters, I was under the impression that CFM didn't much matter if you had the jetting right. I'd suggest trying to find a jet kit vs solder and drilling OR look at the 2-barrel Sniper kit and forget carbs entirely. But I tend to spiral projects well out of control