A period pic from about 1935 showing an LOF-6 being assembled. Each cylinder was individual and protruded deeply into the block.
There were four valves per cylinder with a compression ratio of 16:1. You can see the four Bosch Type A injection pumps, two for each bank. The injection pressure is listed at a low 1600 psi. The LOF-6 had coolant and oil heaters to facilitate starting in cold weather or starting at cold high altitudes.
Whether you’ve seen them in person or not, you know there are diesel in ships and boats, road vehicles of all types, off road vehicles of all types and in every conceivable stationary use. If you are a long time reader of this column, you will also know there were, and still are, diesels in the air.