Hi Fiery - Hermann Fricke is 86 years old and no longer makes engines for sale. Even when he did sell them, his was a very low volume operation, and I think most engines went to those who knew him in Germany. Likely a big share of deals occurred at model engine events.
Now WRT WOHM engines, I know even less... I have asked Luitpold about WOHM-Builder, and he does not have any info - only that on occasion a WOHM radial shows up on German eBay, offered by its builder. Luitpold thinks that he may have a web site but is unable to find it now. Promises to tell us if he learns more from his engine buddies there.
Ronald Valentine offers his neat multi-cylinder diesels on American eBay - as well as TINY singles and new or like-new older diesels, especially Taifuns. As you know, he has a web site, hhttp://www.ronald-valentine-engines.com/Home_Page. Also eBay-related site, htmlttp://stores.ebay.com/Ronald-Valentines-Hobby-Shop. I have not tried to contact him to check on availability of an engine by direct sale thru the web site. Have heard that his son now works for him.
Can someone who has a Valentine engine tell us something about its quality?
Valentine engines are kinda academic for me, however. I can't afford his prices. I wish him and David Owen and Peter Burford and Tom Ridley good fortune. But I most certainly would not want to try to make engines myself for sale. Even if I could...