Well there's also the Jena 1cc....utterly conventional.......except for the intake. The point I was making that AFAIK-there were no sideport ballraced engines of any persuasion during the sideport era of say 1930-1950-the era in which these eccentric bearing diesels were developed and marketed-and light weight was actively sought after, so ball races were not even a consideration-on weight grounds alone, let alone costs. The few ball raced sideports ever produced (Taplin twin, and the Jena) date from the mid fifties and early sixties respectively while Dave's effort is only a decade ago .......

ChrisM
'ffkiwi'