Mixture always too rich- weber 44 idf's |
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Mixture always too rich- weber 44 idf's |
tornik550 |
Jul 21 2014, 04:42 PM
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#1
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
I have dual weber 44 idf's on my 2258. I was having a problem with one of my cylinders and found that the main circuit had some sort of black booger plugging most of the main circuit of cyl 2 and a small on in cyl 3. I completely cleaned everything and reassembled. The car is driving way better. I set the floats at 11.5 without the gasket.
Now I am having the other problem- my car is always too rich. At idle my a/f ratio is 13:1 which is ok for me. If I try to lean it out any more then I get popping on decel at low rpm's. On the main circuit, I am using 125 mains, f11 et, 210 ac and I am consistently around 10.2:1. I can but smaller mains but it seems like I shouldn't need that small of mains. My setup- idles-50 mains-125 et-f11 ac- 210 vents- 34 Any ideas of how to lean the main circuit? |
jmill |
Jul 21 2014, 07:55 PM
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#2
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
If you're not able to introduce enough velocity through the carbs (even though it's a fairly large displacement motor) you're likely to see a rich condition across the RPM range. You have that backwards. More velocity = more vacuum signal. Decreasing the vent size would increase the vacuum signal to the mains and cause an even richer mixture. You can lean the main circuit by either increasing the AC jet size or reducing the main jet size or doing both. I agree that your jetting seems in the ballpark but your AFR says different. A 120 main and a 220 AC jet is also in the ballpark. Popping on deceleration is usually caused by intake or exhaust leaks. Make sure everything is tightened up. |
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