Thanks, Jack, for the webshots link. I posted 5 images of two Delavergne diesel engines. These were taken last August at the Mennonite Heritage Museum in Goessel, KS.
They have a large collection of engines and old farm equipment on display, and every year they let collectors bring in even more stuff to show and run. Hit and miss, diesel, steam, horse drawn -- if it has moving parts and it's old, you'll probably find it there.
The big twin was running on straight canola when I was there. Every power stroke shook the ground a little. They fire it up late morning, and the smell of burning veggie oil gets people coming first to see the engine and then to buy fried treats at the food booth.
The smaller engine was running on light filtered crude. It was a real treat watching the operator fire it up, because he sorta climbed onto the flywheel and put a lot of body English into turning it. it didn't look to me like he was bouncing it against compression like some guys do, just pulling it through with the compression released and then letting inertia do the rest.
Extremely cool. if any of you have a chance to visit an old engine show, do it and you'll have a great time.
Russell