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| Holley 1920 Adjustments https://slantsix.org/forum/viewtopic.php?t=16060 |
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| Author: | Slantedbrain [ Mon Feb 06, 2006 7:52 am ] |
| Post subject: | Holley 1920 Adjustments |
I was looking through the FSM and I noticed that there is no label on the 1920 for fuel mixture adjustment screw, but there in on the BBD, at least I think there is. I'll have to double check. Point is, is there a screw adjustment for the fuel on the 1920? If so, where the hell is it? |
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| Author: | Reed [ Mon Feb 06, 2006 8:00 am ] |
| Post subject: | |
Are you referring to the idle mixture screw? If so, it is the screw in the base of the carb on the opposite side of the idle speed screws. |
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| Author: | Slantedbrain [ Mon Feb 06, 2006 9:50 am ] |
| Post subject: | Yep |
Yep, that would be the one, thanks Reed. And before I forget to ask, what is the proper way to adjust it, b/c if its by smell, I'm screwed. Erm, no pun intended there. |
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| Author: | Eric W [ Mon Feb 06, 2006 10:01 am ] |
| Post subject: | |
Turn the screw in until the engine starts to run rough, then turn it just starts to smooth out and you hear the rpms raise. This will get you in the ball park. The best way to adjust is get a vacuum guage, hook it up to the choke pull off vacuum port (with engine warmed up of course) and adjust the screw out until you get the highest vacuum reading. |
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| Author: | Slantedbrain [ Mon Feb 06, 2006 10:42 am ] |
| Post subject: | And... |
...Thanks again. Another fun thing to fix up on the car. |
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| Author: | Reed [ Mon Feb 06, 2006 10:44 am ] |
| Post subject: | |
Quote: The best way to adjust is get a vacuum guage, hook it up to the choke pull off vacuum port (with engine warmed up of course) and adjust the screw out until you get the highest vacuum reading.
Actualy, the best way to set it is to install an O2 sensor and get a air/fuel ratio guage and set it to stoichiometric. Barring that, Eric's method is best.  
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| Author: | Josh [ Mon Feb 06, 2006 1:02 pm ] |
| Post subject: | |
What is the best way to do this on a dual 1bbl set-up? |
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| Author: | Reed [ Mon Feb 06, 2006 1:53 pm ] |
| Post subject: | |
Start your tuning with the carbs having the mixture screws exactly the same number of turns out, then turn the mixture screw on each carb 1/8 turn at a time. Or run dual exhausts and put an O2 sensor in each exhaust line. |
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| Author: | vynn3 [ Mon Feb 06, 2006 2:23 pm ] |
| Post subject: | |
Quote: Start your tuning with the carbs having the mixture screws exactly the same number of turns out, then turn the mixture screw on each carb 1/8 turn at a time. Or run dual exhausts and put an O2 sensor in each exhaust line.
... and this proceedure would apply to a BBD as well?VM |
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| Author: | Reed [ Mon Feb 06, 2006 3:38 pm ] |
| Post subject: | |
Yes! But on the BBD you can also choose to run the inboard mixture screw 1/8-1/4 turn leaner than the outboard screw, just to compensate for the orientation of the carb. |
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