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Old 05-25-2008, 08:11 PM
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edelbrock tuning question

Hey, i have a 401 nailhead that i put a 1411 edelbrock carb on. When i drove it home with the different carb it was just fine, but ever since i put the new 750 cfm carb on, it stalls owhile idling after driving about 30 seconds after it warms up. i'm assuming the problem is the carb because thats the only real engine mod i've done so far what should i do? what size metering rods, if thats the case? what about the tuning kit available? thanks!

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Old 05-25-2008, 08:44 PM
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The calibration kit you need is #1489. What carb did you take off? The 1411 carb should have worked good on your engine right out of the box. Make sure you do not have a vacuum leak, and you have your distributor hooked to the proper port on the carb.
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Old 05-25-2008, 09:10 PM
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When all else fails , Turn both A/F mixture screws all the way closed , then open them up 3/4 of a turn each. If you want fuel economy ,start it up and close one till the idle gets rougher , then open it up just enough to smooth back out. Repeat with the other side next. If you want HP , OPEN one until it starts to idle rougher , then close it just enough to smooth it back out. Repeat with the other side.
Best of luck to you on your adventure.
Mike
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Old 05-25-2008, 09:16 PM
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Here's the Owner's Manual. You should be able to tune it down to a gnat's eyelash with this information......
http://www.edelbrock.com/automotive_...ers_manual.pdf
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Old 05-25-2008, 11:04 PM
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Quote:
Originally Posted by 79C10
When all else fails , Turn both A/F mixture screws all the way closed , then open them up 3/4 of a turn each. If you want fuel economy ,start it up and close one till the idle gets rougher , then open it up just enough to smooth back out. Repeat with the other side next. If you want HP , OPEN one until it starts to idle rougher , then close it just enough to smooth it back out. Repeat with the other side.
Best of luck to you on your adventure.
Mike

Sorry. Idle mixture has NOTHING to do with fuel mileage and/or horsepower. It is for idle quality only.
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Old 05-26-2008, 07:43 AM
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Quote:
Originally Posted by Greg T
Sorry. Idle mixture has NOTHING to do with fuel mileage and/or horsepower. It is for idle quality only.
O.K. , but that info comes directly from their installation DVD that came with my 1408 Carb.
You might want to tell Edelbrock the same thing.
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Old 05-26-2008, 10:27 PM
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I most certainly will. That is nonsense and absolutely incorrect information. And any carb guy will tell you the same. The correct adjustment is as follows. For tailpipe sniffers you should turn the idle mixture screws alternately until you have reached maximum vac, RPM and idle quality. Then, turn each screw IN to obtain a 25 RPM drop for each. First you turn one screw to drop 25 RPM, then the other, then back to the first one and open it up to achieve max RPM, then turn back in to a final 25 RPM drop. This yields a total of 50 RPM drop which is supposed to help please the pipe sniffers.
This setting COULD result in a slight cough or hiccup on acceleration.
So, for High Performance use you would adjust the screws for highest vac, RPM and idle quality and leave them there. This would equate to a little higher emission output but is better for off idle acceleration. It has nothing to do with horse power.

Last edited by Greg T; 05-27-2008 at 07:56 AM.
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