On Dec 11, 6:10 am, Bruce in Bangkok wrote:

The original Rudolf Diesel design was planned to use powdered coal.

But, it wouldn't work. So, he turned to peanut oil, which ran like an
otto.

Sorry for the pun, but isn't "automobile" a play on the Otto
combustion cycle?

Could nano powdered coal be made to work in a Diesel? Effectively?
Efficiently?

Terry K