carb problem
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New User
Joined: Dec 2003
Posts: 22
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From: wa
carb problem
hi guys, i have a 77 f-100 with a 351m rebuilt just about 1000 miles ago and while im driving doen the road it seams that im not burning all the gas when i really punch it becasue it studers a little bit, i believe it may be off on the front metering screws on the carb (edelbrock 600 cfm) 
im i right and how much should i adjust each screw? thanks tye
im i right and how much should i adjust each screw? thanks tye
Thread Starter
|
New User
Joined: Dec 2003
Posts: 22
Likes: 0
From: wa
yes i had the timing checked and yes it does have a vacuum advance the distributor is also brank new too, the truck runs ok im just trying to get max performance out of it. it thought if i turned down the scews a little bit it would push more air and less gas so it would burn more efficently but guess not
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
BCS is right on that one...the screws are for idle mixture only. The Edelbrock can have jets and metering rods changed that would directly effect the performance.
One way of telling if you are not burning the gas properly is to remove a few spark plugs and look them over. Also, when you "punch" it...try using your door mirrors and look back...do you see any black smoke? If yes...then you are running rich. (a little is normal...)
Just a FYI...when you turn the screws, all that is being affected is the amount of air flow. Has nothing to do with fuel directly. So turning the screws "IN" would reduce the amount of air, thus resulting in more fuel. Go the other way...and the opposite is true.
Hope this helps some...
One way of telling if you are not burning the gas properly is to remove a few spark plugs and look them over. Also, when you "punch" it...try using your door mirrors and look back...do you see any black smoke? If yes...then you are running rich. (a little is normal...)
Just a FYI...when you turn the screws, all that is being affected is the amount of air flow. Has nothing to do with fuel directly. So turning the screws "IN" would reduce the amount of air, thus resulting in more fuel. Go the other way...and the opposite is true.
Hope this helps some...
