Leaning fuel mixture for altitide

[osamenor]

Do any of you recommend leaning the fuel mixture via the carburetor (I've got a mixture screw on my carb) when going from low altitude to high altitude? I am going from sea level up to about 10,000' for the first time in my rig and haven't messed with the fuel mixture on a road trip. I don't know if it is more trouble than it's worth. I understand that I'll have to re-enrich the mixture on the way back down the hill.

I tried searching the forum and it seems like most people set their fuel mixture for their local area and leave it at that.

Thanks!

 

[Pighead]

I just advance my timing a bit as I climb in altitude, I don't usually fiddle with the idle air screw. Couldn't hurt to try it though.

 

[pb4ugo]

I just advance my timing a bit as I climb in altitude, I don't usually fiddle with the idle air screw. Couldn't hurt to try it though.

^^^^^^^this^^^^^^^

I've been out west and number of times from sea-level. On my sbc, I usually just advance the timing back to proper idle. It needs to breathe. Sometimes I may advance it and bump the idle a little bit. Keep in mind the idle mixture adjustment is for idle. It doesn't really effect anything off idle.

 

[rlong]

Yup.. above. The idle mix screw really only helps at idle and your’e probably not sitting at idle much (if so you could dial back by ear). The rest of the circuits would require re jetting and then re-re jetting when back down so not worth it. (I played the game when I used to run a Holly 350cfm 2 barrel back in the day.. easier to re-jet, but not really worth it)