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
|