[Cayoterun]

More grist or memories:

We set them to their peak at night.
Since they all used natural gas, as said, at night the pipes would be cherry red. Then we'd watch the fire out the exhaust pipe ends. They were all short stubs about two feet long. No mufflers. Set the time and fuel mixture to highest rpm with about two inches of steady, pointed, bluish, red fire out the end. It was pulling it's best at that point.
Then set the throttle so the pump shaft was turning 1,750rpm, then go home and bed.

We never thought to use ear protection back then, so no need to wonder why we all wear hearing aids, and have ringing in our ears now.

Yep, the memories are good for a 73yr old. Be patient with us ol' timers, as someday, I hope you have as good of memories as we have, back in your good ol' days. Remember those days are now for you.