Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

jmanhoff said

I think I got my carb names mixed up lol oops.

Anyway, I started messing with the timing and Idle mixture first, I tried 10, 12, 14, and nothing made a real difference. Timing is all in 31 degrees at about 2800, I haven't messed with the curve yet. I then went to the jets as I was burning through 20 gallons of gas every 100 miles, and being in college thats not exactly something thats easy to afford. I went into a long parking lot, opened up the throttle, turned it off, checked the plugs. Black and wet. So I ordered 68s, put them in, did the same test. No longer wet but still black, so I went to 66s and I'm where I am today.

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Well, it's never going to be a mileage miser. You may get it "better" but you bought a PERFORMANCE carburetor, not an economy carburetor. Secondly, the jets have zero to do with idle mixture, so if you're trying to make a difference with idle fuel changing jets, it'll never happen. The jets are on the power circuit, not the idle circuit. That carburetor is infinitely adjustable, as it has adjustable air bleeds on top, adjustable idle fuel restrictors in the metering block and adjustable power valve restrictors in the power valve circuit. You can get over your head REAL quick if you don't have experience tuning. My suggestion would be to invest in a wide band O2 tuner, read up on how to use it, get it installed and tune with that.