| Re: [GMCnet] Is quadrajet carb with altitude compensation still available ?? [message #172585 is a reply to message #172541] |
Fri, 08 June 2012 12:25   |
Douglas Norton
Messages: 191
Registered: April 2008
Karma:
|
Senior Member |
|
|
I have tried two inexpensive solutions to high altitude carburetor issues. It is not very hard to change out main jets to slightly smaller jets. You can pull the top off the carb with it on the vehicle (I got the hang of it after pulling it off 3 or four times). Make sure you have access to a rebuild kit in case you damage the gasket; do not over-torque the front bolts or you can warp the carb. Jets are available at some carb re-builders. Go down from 72 to 70 if your current jets are 72. If you will be above 6,000 feet you might go down another step to 68 jets. Check one or two spark plugs before and after the changes (and at different altitudes); black sooty plugs suggest too much fuel, grey white suggest to little fuel in the mix. Check the color before you head up the hill and perhaps save out an old plug for color reference just after some highway driving. Second, you can advance the timing a few degrees (until just before it starts to
knock or to just before it stumbles a bit on starting).
This is just what I have done. Proceed at your own risk. My GMC has gone many miles with smaller jets even at sea level; I have burned valves on other vehicles by going too lean. I have used a pyrometer and fuel ratio gauges to be safe.
________________________________
From: steve & debbie <zzdebz@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, June 8, 2012 12:18 AM
Subject: [GMCnet] Is quadrajet carb with altitude compensation still available ??
Hello,
sorry its me again .... Does anyone know if you can still get quadrajet carbs with altitude compensation built in.
Wanting to spend time in much higher elevations when we get up and running. Seemed like that could save on gas, and perhaps less engine problems, as the air/gas mixture would be altered. Not got enough cash for fuel injection, so perhaps that would be a temp solution, if available....
cheers and beers
--
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
