Quick how to on tuning my carb (air mixture screws). - Chevy Forums at Super Chevy Magazine Super Chevy

Quick how to on tuning my carb (air mixture screws).

  
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Quick how to on tuning my carb (air mixture screws).

 
355RS 355RS
I love my Chevy Chevette! | Posts: 9 | Joined: 09/07
Posted: 09/28/09
08:00 PM

Trying not to pay a mechanic to do it, wanna learn and do i on my own.  I've researched several ways but want to see what you guys recommend or think is the easiest and most effective way.  Remember, talk slowly with lots of details and step by step.  Thanks in advance.  

 
OldCrLvr OldCrLvr
I love my Chevy Chevette! | Posts: 16 | Joined: 03/09
Posted: 09/28/09
08:37 PM

As a plce to start out I learned in school to turn in the screws all the way. Then out 1.5 turns. From there I forget...Sorry. I borrow my buddys book (which is published my HotRod sorry Super Chevy) and do what they say. I believe they say to turn each screw in and watch the RPM's. I think the objective is try to get it to the highest RPM. You can do this with a vacuum gauge as well. Hope this helps  
1963 Chevy II SS
1970 C10
1971 Chevelle Malibu
2000 Z71
2005 Passat 4Motion

 
355RS 355RS
I love my Chevy Chevette! | Posts: 9 | Joined: 09/07
Posted: 09/29/09
06:35 AM

Thanks.  Anyone else with have their own methods?  Also, what RPM should my car idle at?  I run a 355, with cast iron heads (ported), 650 carb, weiand intake (team g), mild cam with hydraulic lifters and msd ignition system.  

 
68scott385 68scott385
V-6 Camaros rule! | Posts: 68 | Joined: 07/09
Posted: 09/29/09
01:40 PM

start with idles screws at same number of turns out (1.5 - 2)
hook vacuum gauge to read manifold vacuum
turn idle screws evenly until highest vacuum reading at idle is reached
reset idle speed if necessary
should idle smoothly between 700 & 800  
-
i did love my chevette (first car) more than my first wife
my 94 4.3L Astrobrick would outrun the 99 5.4L f350 i had to drive for work

 
85_trans_am 85_trans_am
My first time was in a Chevy | Posts: 240 | Joined: 05/09
Posted: 09/29/09
04:28 PM

who makes the carb. there are free vids online on tuning most carbs. also need to know what kind of distributer you have, and the heads are they factory head or a aftermarket head that is ported.

you also need to learn how to read your plugs. that will tell you what going on with timing and carb tuning. hit me back. I'll walk you thourgh it.  

 
85_trans_am 85_trans_am
My first time was in a Chevy | Posts: 240 | Joined: 05/09
Posted: 09/29/09
04:35 PM

one more thing. how many rpms are you wanting your motor to turn.  

 

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