Posted for "Bruce McEwen" <silkeplsn@worldnet.att.net>:

We have also taken interest in the engine for our ES project but based
on the conversations that I've had, Theilert has had some problems with
engine vibration when scaling up the size of from the 4 cylinder
(Centurion 1.7) to the 6 cylinder (Centurion 4.0).  This information is
a month or two old; maybe they have had some breakthroughs since then.
Has anyone else heard anything on how they are progressing with the
vibration issue?
  
Bruce McEwen & Silke Paulsen