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disable carter 600cfm 2ndaries

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Old Feb 7, 2010 | 04:29 PM
  #1  
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disable carter 600cfm 2ndaries

I'm sure the info is here but I haven't seen it.
I'd like to disable the 2ndaries on my carter 600cfm stock 4bbl ('87 f150 351) carb. How do I do this?
I don't need the performance/power of the 4 bbl.

Thanks
 
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Old Feb 7, 2010 | 05:10 PM
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just don't punch it.
 
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Old Feb 7, 2010 | 06:23 PM
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quicklook2 has a point...the secondaries won't kick in until you put the hammer down. Keep off the pedal and they wont' kick in.
 
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Old Feb 8, 2010 | 08:09 AM
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I drive w/a very light foot alway's and am just not sure when the 2ndaires come on.

Had another 351 4bbl but w/mechanical advance. I could disconnect the 2ndaires unless I needed them getting me the better gas milage I'm after now.

This trucks a '87 heavy 1/2 ton crew cab/extended bed w/ factory dual range auto trans (even badged as such behind the back wheels) from the factory getting around 14 mpg ........ runs excellent and hate to mess with the jet's etc.
 
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Old Feb 8, 2010 | 10:04 AM
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i would not mess with it.
 
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Old Feb 8, 2010 | 10:37 AM
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14mpg from a truck that big is excellent, don't touch a thing.
 
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Old Feb 8, 2010 | 10:43 AM
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exactly my thoughts.
 
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Old Feb 8, 2010 | 12:56 PM
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yeah, 14mpg is very good. Also, if the secondaries don't work until you nail the throttle, disabling them will net you no mileage gains the way you drive, but will not give you the extra power that you could be getting, if you should ever need it.
 
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Old Feb 9, 2010 | 05:04 AM
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From: Mt Vernon
I expect you're all right guy's. "goliath" is excellent for what he's built 4 which is trailer towing. When I bought him he was set up as a 5th wheel hauler.
I use him for vintage travel trailer towing and shall leave his engine alone.
Thank you all for the input
 
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Old Feb 9, 2010 | 05:19 AM
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Don't fool with it! It won't do you any good. Also, there may be an time when you need the extra power to pull something or just accelerate up a steep hill while towing.
 
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Old Feb 10, 2010 | 07:34 AM
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thanks all. Maybe the answer is to get a boneyard, smaller cfm 2bbl & manifold and swap 'em out as needed if I wanna get ****
 
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Old Feb 10, 2010 | 10:45 AM
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one more time: just leave it alone.
 
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Old Feb 10, 2010 | 12:03 PM
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wow how about u give him the info he was wanting and stop with the leave it alones.

u can adjust the floats to where they wont let anymore fuel in to the rear fuel bowl...

but when u do this and leave it like this for long enoughu will have to rebuild the carb. or it will leak... uhm there are some other ways that i cant think of right now

but if u just want the primarys then u could prolly find a 2bbl pritty cheap and throw a rebuld kit in it...
 
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Old Feb 10, 2010 | 12:17 PM
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Originally Posted by Hitokori
wow how about u give him the info he was wanting and stop with the leave it alones.
I'm confused, if there is no extra fuel consumption unless you hammer the throttle (which never happens) aren't you looking at a theoretical 0mpg gain?
 
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Old Feb 10, 2010 | 12:45 PM
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he wanted to know how to shut them off.


it doesnt matter if its going to make any difference

maybe he just wants to govern it... and as far as the towing i have seen a butt load of f250s with just a 2bbl on them
 
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