If you’re like many of us, you don’t spend a lot of time thinking about the pistons in your engine. Most of the time you don’t need to, but there are times when burnt, scuffed, or cracked pistons need ...

It would have been revolutionary: an internal combustion engine without oil. And it might have worked. But lots of real-world issues got in the way.

SAE Transactions, Vol. 23, PARTS I and II (1928), pp. 145-150 (6 pages) COMPROMISES are necessary in designing a piston, sacrificing the quality of least importance under the given conditions.