I was on The Ford Barn the other day and I saw this in a response posted there:
"And last I learned at an AACA conference as sometimes happens motors are not happy with available carburetion. When the power, on acceleration, is lacking try a quick sharp pull of the choke rod (up-down). This is a band-aid, but will get the roll going and ready to cruise. " (Post- A newbie in Model T world).
Has anyone ever heard of this or tried it?
When you suddenly open the throttle, the mixture can become momentarily too lean. An accelerator pump tries to solve this by giving the incoming mixture a brief slug of extra gas. Absent an accelerator pump, a brief application of choke might do the same thing. I've never had to try it, but it sounds plausible.
Kind of difficult unless you have 3 hands. How do you steer while pulling the choke and advancing the throttle? Easier to just open the mixture about 1/4 turn just before advancing the throttle and then adjust to where it runs smoothly.
If that happens I would say you may be running too lean, the engine is running too cold, the spark advance is not right or you are running an old puddle type carb from the model T days.
Having the choke closed for a split second is going to shut off all incoming air and cause a hesitation in the power band anyway.
That really wouldn't be effective. You would most likely send a slug of gas into the motor that would momentarily flood it, causing it to stumble for a few revolutions.
As Norman and Aaron suggests, just have your carb adjusted right to begin with and all of this becomes unnecessary.
Back in the 1070's our sons Dave and Bill were driving our C powered 1931 Model A Coupe home from Warner Springs to Los Alamitos and we were towing our 1913 Cadillac Touring car with our 69 Ford 250 Pickup Truck.
That C engine could go faster than we could and Dave kept up with us. We had an open trailer and could keep our eye on the boys who felt rather adult by driving an antique car on the freeway. Anyway before we got to the freeway we were driving close to Glen Chaffin's garage in Corona on a two lane road when the Model A started to slow down. It finally got almost a half mile behind us and so we pulled over to let them catch up.
I walked back to the A and it had a rather fast idle. I asked what was wrong and he said it started to slow down and he had to pull the choke to keep it running. Harris boys are engine savvy. Dave shut it off and we opened up the hood. Now you are perhaps not going to believe this but the carburetor had come lose and was hanging down almost a quarter of an inch from the manifold and the nuts were barely holding it on. We tightened up the nuts and it ran as sweet as pie and off they went.
SO YES, a choke will add more gas and boy was that Model A running lean that day but the choke sure richened up the mixture ;~)
I agree with Gilbert for the reasons he stated. Stop gap measure to be sure but I think it would work.
I had a similar experience to Frank's back in the 1950's when I was on the way to high school and the A acted like it was running out of gas. The carburetor was hanging. Tightened it up and it ran fine again.
Norman, welcome to the hanging carburetor club. If we had been using the dreaded downdraft carburetor that would not have happened ;~)