I've had a Stan Howe OF on my 1926 for two years now and it has worked great, with one exception, the car would stumble moving through 14-16 MPH. For some reason I remember that the economizer could be causing this. So today, I removed the adjustment nut from the economizer stem, so the economizer valve would remain closed. The stumble went away. With that in mind, I got out the book and a few other references that I have and attempted to better understand the economizer. The economizer allows additional air into the mixture flow at throttle closed to slightly open, then closes for great throttle opening. Here is how I adjusted the economizer in an attempt to eliminate the stumble. After setting the high and low speed adjustment screws, I set the economizer so it would not open for any throttle position. No Stumble. Then the economizer screw was turned down 1/2 turn. The stumble showed up and was pretty bad. I continued 1/2 turn increases and monitored the stumble. It improved, but not what I thought was proper. Then I figured that since the economizer was leaning out the low speed, maybe the low speed screw needs to be opened. So I started again with no economizer. So far I have found that turning the economizer down nut 2 1/2 turns and opening up the low speed screw 3 clicks has nearly eliminated the stumble. This adjustment has really made the car run even better than before. I can cruise around at 15 MPH with no stumble, accelerate, slow down. I have written this because I have struggled with the economizer setting before, but this seems to work, at least for me. My 2¢, Mike
Mike I have never adjusted my economizer and there isn't much info in the book about how to adjust it.
Interesting that low speed adjusting screw is opposite of the high speed to richen the mixture.
I've found that even with an inline filter it is very easy to get some clogging in the low speed jet. I've had to clean mine out a couple of times.
I've noticed some dirt in mine. I keep a close eye on my gas tank and gas cans and try to keep my sediment bowl clean.
Seems most of the 'O' series Stromberg's have an economizer, but most books say it is set at the factory and not much else. Mike