Edlebrock AFB carbs

[luke-ao]

I have this carb of unknown history, I got it at an auction on a 302 I purchased. When I screw the air-fuel mixture screws all they way down, instead of the engine stalling as expected, one revs up and one does nothing. I'm just curious what might be the issue, as I don't have plan to use it, but may need it down the road.

Actually when I think about it, I had several AFB's that screwing the air-fuel mixture screws all the way down had no effect on the engine at all. I'm not really a carb guy but I've rebuild a few of these and never had much luck with the finished carb. That's not saying much but I've never really had any real instruction with carb rebuilds and what to look for in regard worn out areas that may not be repairable unless it completely obvious. It's easy enough to tear down, clean and rebuild, but that's really the extent of my knowledge.

[RottenAppleRed]

I happen to be a huge fan of these carbs. The AFB style carburetor is a very simple design...as far as components are concerned. I would say that 25% of all my posts on various auto related forums are on the importance of using the right filter. These carbs are very prone to having the metering jets clogged, as they reside in the lower most part of the fuel bowl. If you think about it, the mid eighties was the last time production vehicles had carburetion. That means the newest an automobile could be, getting a carb replacement, would be at least 30 years old. That's a lot of time for sediment to form in the gas tank. Obviously a fuel system without a filter is doomed to have issues with dirt. It's the systems where the owner thinks they are protected with a glass filter housing and mesh element that sneak up with problems. Those filters allow tons of particles through them to the carb. It is best to use a filter with a paper element. I like the semi-clear plastic housing with the crimped metal outlet. This allows you to still see the fuel flow and cleanliness of the filter. Once that's taken care of, there are a few species on rebuilding and tuning the AFB style carburetor. Here are a couple.

http://www.crankshaftcoalition.com/wiki ... _guide.pdf

http://mre-books.com/sa130/

[luke-ao]

I always run an inline filter, but this particular carb I don't know anything about. I'll definitely hang onto it but I'm not going to fool with it right now..