holley carb help

[nicotine]

i need help or some specs on how to tune my holley 4 barrel i need to know wich of the 2 adjustments on each side are and wich way to turn for adjusment.

 

[socalblazer]

If you're talking about the small (thin) adjustment screws those are to adjust the idle mixture. Turn them all the way in (clockwise), then back them out (richen) about 2 1/2 turns. This is a base, then you can adjust (equal side to side) from there. Don't go much leaner (in) then 1 3/4 turns so you don't burn any valves.

 

[nicotine]

which side is what for mixture right =? left=?

 

[swissk5]

i checked the number that's stamped in my carb and downloaded the manual on
http://holley.com/TechDocs/Instructions/Holley/Holley.aspx

they tell you all about every screw on your carb. great reference!

 

[socalblazer]

Right is right and left is left, that's why you want them to be equal. There usually isn't an adjustment on the rear unless it's a center squirter (race).

 

[nicotine]

it seems to rich and 2 turns and if i go to 1 1/2 turns would that be to bad because it doesent seem to smeel rich there.

 

[mrk5]

I like to use a handheld tach. If you're going to do your own tuning you might as well invest in one. Mine has the tach along with all the other mulitmeter type stuff.

Here's the method I use:

Conventional Idle Mixture Screws that provide a leaner A/F when turned clockwise and richer A/F when turned counter clockwise. The idle air flow is controlled by a conventional screw that opens the Primary Throttles. The following procedure should be used to set the idle mixture and speeds.

1. Fully warm engine and ensure choke is fully open.

2. Air cleaner in place.

3. Set desired idle with the curb idle screw.

4. Adjust the Idle Mixture Screws on ONE side to get the maximum possible RPM. Do not go rich beyond the maximum curb idle point.

5. If the above changed the idle RPM more than 40 RPM, then readjust the curb idle.

6. Adjust the side OPPOSITE of that in Step 4 to get maximum RPM.

7. Reset the curb idle.

8. Carefully trim each Idle Mixture Screws to again get the maximum idle RPM.

9. Go leaner just enough to get a 20 RPM drop in speed.

10. Reset the speed to the desired RPM.

11. This is a Lean-Best Idle Set. Setting richer than this will not improve idle quality or performance, but could tend to foul plugs.

If it's an auto, I like to do this with the tranny in Drive while someone holds the brakes.