I did not explain the other stimulus to this story. Vacu-Jets by design will tend towards leaner mixtures as the engine wears.
The challenge, today, is to make engines that can function on leaner mixtures. This is big business in the auto industries. A lot is at stake.
This was the main reason for my above rant. Modern engine theory is about crossover engines - that behave as both spark ignition and compression ignition engines! Our understanding of gasoline and diesel engines is no longer valid. The video is below...
