bog

Dean Oliver · 05-26-2010, 08:20 PM

Assuming the tune up is at least close (and I can't emphasize that point enough), the main causes of a Q-jet bog typically are related to:
- Too much fuel pressure. Do not depend on one of the little small online gauges for this. Double check your gauge with a second gauge.
- Air valve tension too loose. Keep in mind that adjustments should be made in small increments, like 1/8 turn at a time.
- Weak fuel system. Simple test. See how long it takes your fuel system to fill a one gallon container. Most SBC stockers with a Q-jet should flow a gallon in no more than 30 seconds through the entire fuel system, regulator and all.
- Improperly sized needle/seat (too big or too small) and/or improper float adjustment.

This is not an all inclusive list, but it is some of the more common things. A problem that I see too often is that a racer will just assume these things are good rather than take the time to actually check. Hope this helps. Give me a call if you want to talk more about it Bill.

Dean

05-26-2010, 08:20 PM	#25
Dean Oliver Junior Member Join Date: May 2002 Location: Stuttgart, AR Posts: 53 Likes: 1 Liked 0 Times in 0 Posts	Re: bog Assuming the tune up is at least close (and I can't emphasize that point enough), the main causes of a Q-jet bog typically are related to: - Too much fuel pressure. Do not depend on one of the little small online gauges for this. Double check your gauge with a second gauge. - Air valve tension too loose. Keep in mind that adjustments should be made in small increments, like 1/8 turn at a time. - Weak fuel system. Simple test. See how long it takes your fuel system to fill a one gallon container. Most SBC stockers with a Q-jet should flow a gallon in no more than 30 seconds through the entire fuel system, regulator and all. - Improperly sized needle/seat (too big or too small) and/or improper float adjustment. This is not an all inclusive list, but it is some of the more common things. A problem that I see too often is that a racer will just assume these things are good rather than take the time to actually check. Hope this helps. Give me a call if you want to talk more about it Bill. Dean