Chris in Santa Cruz CA
I believe that’s a vw engine in an industrial application running an air compressor or a pump of some kind. I have built numerous aircooled vw motors both carbd and fi. This looks like some kind of mechanical fi. Just wild ass guessing. Unlike bmw in the states anyway vw skipped the mechanical fi and went straight to a very precise electronic fi which demanded very tight tolerances for valve clearance and timing to run smoothly. They quickly went to hydraulic valve lifters because the heads especially in the southwest us ran really hot and the valves very quickly went out of tolerance. With my 76 Westfalia if I wanted to not adjust the valves often I needed to go 55 on hot days. As romantic as the older vw buses are in cali history they were poorly specd for freeways and warm weather.