Stock Carb - moving from 5600ft to 200ft

[Lumpskie]

This may be a dumb question. I got a job offer that I couldn't refuse. So, I'm moving from Colorado to New Hampshire. This means I will be dropping from 5600ft to roughly 200ft elevation. Now, I know my carb runs perfect from 4500ft to 14000ft but I don't know about what will happen as I approach sea level. Will the diaphragm mechanism in the carb be able to adjust enough to keep my rig from going lean? Or should I buy some jets (no idea what size or how to install them), ship the waggy and figure out how to tune it when I get there?

[csuengr]

The carb will be fine. Need to retard the timing about 1 degree for every 1000 feet.

[Lumpskie]

^Got it. Good to know!

[Nikkormat]

^Got it. Good to know!

N'hampsha? That's a long drive to go to Ouray.

We should run a trail before you leave. I'm dying to see your Waggy in action.

[Tatsadasayago]

If the carb has an altitude compensator that is in good working condition, you should be fine.
Most late GWs had them and they actually worked! They lean out the mixture by creating an additional air bleed...essentially a calibrated vacuum leak at the venturi.

[tgreese]

They have class 6 roads in NH.

[Lumpskie]

^Got it. Good to know!

N'hampsha? That's a long drive to go to Ouray.

We should run a trail before you leave. I'm dying to see your Waggy in action.

That's a good idea! I'm here all week this week and will be around this weekend. After that, I go on my house hunting trip and leave the following weekend for good.

If the carb has an altitude compensator that is in good working condition, you should be fine.
Most late GWs had them and they actually worked! They lean out the mixture by creating an additional air bleed...essentially a calibrated vacuum leak at the venturi.

I was hoping you'd say that! I'll definitely check for ping based on timing when I fire it up out there but I think the carb's altitude compensator is in good working order.

They have class 6 roads in NH.

I've been reading about that. I haven't found any routes yet but I hear joining a local 4wd club is the best way to find out where those roads and trails are. Are you in a local club out there?

[tgreese]

No, but I used to hang out at the NEOW site. You might look here - http://forums.exploringnh.com/showthrea ... -MappingNH

[Lumpskie]

No, but I used to hang out at the NEOW site. You might look here - http://forums.exploringnh.com/showthrea ... -MappingNH

I just joined that site, under the same screen name. If you still visit it, say "hi" on my intro thread!

[Nikkormat]

Can't remember if I told you this or not, this Saturday CFSJA is doing a trail run of Yankee Hill up in Central City.

[Lumpskie]

I'm sorry I missed this!

[FSJunkie]

The altitude compensator doesn't adjust the idle speed or idle fuel mixture, so you should reset those when you get to lower altitude.

It's normal to advance your timing 5* for high altitude operation, so you should retard it back to factory spec for low altitude operation if it was advanced before.

You're going to have a lot more power at low altitude. At 5000 feet you're down roughly 20% on power. It'll feel like having two more cylinders.

[babywag]

Actually it is 7* per manual. http://oljeep.com/gw/mr253_IS/MR253-IS-13E.pdf
I'd check the jets as well, someone may have installed smaller ones.
57 is the norm for sea level/low altitude, but a tad rich, 55's are better.

I wouldn't count on the altitude compensator, 'bout 50/50 shot it actually works.