Almost nothing

pgerts

Old age member
Mentor
While looking at some spares at my friend i found some really cute engine parts.
010 motordelar.JPG
Can anyone identify the bottom cylinder.
The top is for a Cox 0.01 TeeDee but what is the bottom one?
Seems to be a smaller bore but a thicker pin, possible a diesel?
009 kolv med cylinderfoder.JPG
 

Balsa to Foam

A Jack of All Planes!!!
Probably an older diesel, possibly one that Taifun made, that doesn't have the anodized aluminum cooling fins. I would look that direction.