Does anyone know of a way to put an air filter on 26-27 vaporizer carb?
Sorry, filter would be a moot point. There is a small air passage that leads down to the internal "carb" bowl area that mixes air with the gas vapor that would better benefit from a filter.... and amy get clogged, ..... but,,,, no way to filter that opening from road crap.
The best is to make sure all connections are sealed and keep the hot plate section clean.... regular maintenance. Been there.
Enjoy your weekend, I'll be at work.
It's possible to not only have an air filter on a vaporizer carburetor, there was an official Ford air cleaner introduced in 1927.
Unfortunately, it was not on the Holley vaporizer. It was on the Kingston B-1 "gasifier," which was the last carburetor to be factory installed on a Model T. The air cleaner is a steel bulb connected to the down-turned air intake with a single slotted screw. Holes punched around the periphery of the bowl admit air. (The same structure provides both sources of air to the carburetor, the hot air to vaporize fuel and the cold air to mix with the vapor.) The air is forced to make a 90-degree turn to be sucked into the carburetor, across a pool of motor oil in a concave dish below the air intake holes. Heavy dust particles are encouraged to stick to the oil as they make the turn.
The owner is expected to replenish the oil in the pan on a weekly basis by squirting his oil can into a convenient air hole. I'm not sure how effective this scheme is, but it's better than nothing, and it's extremely simple. I would think that it could be improved by stuffing some steel wool in the bulb, but that's not mentioned in period literature.
From examining the B-1 patent document, I get the impression that Kingston wanted to sell Ford the carb for his new Model A. Ford was interested, but it was expensive, and he wanted to beta-test it on the Model T. Henry knew that if he started installing it on Model T's he could count on feedback, pro or con, in the form of letters from customers. It was free field-testing from real users, instead of having engineers try to wring it out.
See Jim Kelsey's post titled, "Attaching An Air Filter", in the 2011 Forum.