I just came across this site for users/collectors of old (model aircraft) engines. The site is called http://www.old-engine-model.com/en/ seems to cover all types of older engines (CO2, diesel, ignition and glow) and is located in the Czech Republic. As well as discussing old engines it also seems to have a buy/sell section. It looks like the site is run by one (knowledgable) enthusiast.
Fly with the eagles
