 Mixture always too rich- weber 44 idf's |
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| 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? |
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| jmill |
Jul 22 2014, 05:32 PM
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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 |
By decreasing the vent size you just lowered the RPM at which you came on the main jets and enriched the mixture throughout the jet range. You also decreased your top end potential. I would have expected it to exacerbate your current problem. What was your AFR reading with the 32's?
The only reason I'd decrease the vent size would be to cure a lean transition issue or enhance low RPM drivability. On a side note, my handy dandy chart says the 36 vent is right for you with a 6K redline. They should also lean out your mixture. |
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| tornik550 |
Jul 22 2014, 05:44 PM
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#3
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(jmill @ Jul 22 2014, 07:32 PM)  By decreasing the vent size you just lowered the RPM at which you came on the main jets and enriched the mixture throughout the jet range. You also decreased your top end potential. I would have expected it to exacerbate your current problem. What was your AFR reading with the 32's? The only reason I'd decrease the vent size would be to cure a lean transition issue or enhance low RPM drivability. On a side note, my handy dandy chart says the 36 vent is right for you with a 6K redline. They should also lean out your mixture. I think I'm gonna go back to my 36 vents. Last time I had then installed I had a lean transition zone however I also found that I had another carb issue which has now been fixed. Hopefully that will help. Just curious- what ballpark jet sizes do you think I should need if I have 36 vents (just so I can get an idea if I am in the right range) |
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Posts in this topic
tornik550 Mixture always too rich- weber 44 idf's Jul 21 2014, 04:42 PM
Jackgerard Will the car pop when it is to rich or to lean cau... Jul 21 2014, 05:47 PM r_towle smaller vents, try 32mm.
increase the velocity of... Jul 21 2014, 05:48 PM
ThePaintedMan
smaller vents, try 32mm.
increase the velocity o... Jul 21 2014, 05:58 PM rhodyguy pulls like a demon @3k+ yes? Jul 21 2014, 06:30 PM tornik550
pulls like a demon @3k+ yes?
YES!!... Jul 21 2014, 06:46 PM jmill
If you're not able to introduce enough veloci... Jul 21 2014, 07:55 PM ThePaintedMan Good call John. Must have read that wrong after a ... Jul 21 2014, 09:01 PM lonewolfe Which cam are your running and how are your heads ... Jul 22 2014, 12:45 AM Jake Raby When an engine always runs rich I question exhaust... Jul 22 2014, 11:21 AM rhodyguy good insight jake. thanks! Jul 22 2014, 11:29 AM r_towle
good insight jake. thanks!
One proven way to... Jul 22 2014, 01:39 PM tornik550 I decreased the size of my vents to 32 and the car... Jul 22 2014, 03:05 PM Dr Evil :popcorn: Jul 22 2014, 03:20 PM tornik550
:popcorn:
Sooooo- have you moved to ohio yet? ... Jul 22 2014, 03:42 PM Dr Evil Looking at houses again next week. Last day at cur... Jul 22 2014, 04:19 PM jmill Initial jetting is always a SWAG and each engine i... Jul 22 2014, 07:01 PM |
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