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| Holly 1920 idle mixture adjustment https://slantsix.org/forum/viewtopic.php?t=7611 |
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| Author: | Demonboy [ Thu Nov 20, 2003 4:51 pm ] |
| Post subject: | Holly 1920 idle mixture adjustment |
I have a 72 Demon with the Holly 1920 carb on it. I have had it for over 10 years and it has always done well on the emmissions tests. I had it tested today and it just barely passed the Carbon Monoxide test. It is supposed to be a max of 7% and its reading was 6.05%. (This is an idle test only). In the past it has been 1 to 2%. I am thinking that I need to adjust the idle mixture to lean it out. What I can't remember is which way to turn the screw to lean the mixture. Does anyone know? Also, any other suggestions for the high number? Thanks |
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| Author: | Mike@68Dart [ Fri Nov 21, 2003 9:20 am ] |
| Post subject: | |
turn it in (clockwise, that is) to lean it out... I use to turn it in 'til the engine stumbled, then back it out a half turn now I use a vacuum gauge, going for highest manifold vacuum at correct rpm... |
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