Originally Posted by Wayne Grenning
Another one that was in the vaults. I heard years ago, such a gizmo existed but always thought it strange that they would go through all of the effort for 4 HP. ( especially when their single cylinder product line included engines much larger) Possibly two cylinders were used for very constant speed regulation - dynamo service?? This engine has spur & bevel gears, single sideshaft, vertical governor ( unusual for Deutz) and variable cutoff speed control. Anyone out there know why they did this for such a small HP? It is basically (2) 2 HP slide valve engines morphed together. What an amazing machine ! - Wayne
Many thanks for posting these pictures! It is strange indeed that they built a 4 HP two-cylinder, but as you say, dynamo service would have been the main reason. Besides of that, it was perhaps also the 'prestige' factor? The vertical upright governor is in my opinion more out of necessity, as a hanging governor would not be accessible? Also strange is, that most of the bigger (and later) 2-cylinder had two sideshafts, although the design with the central shaft seems more revolutionary to me.
So this makes 3 two-cylinder slide valves known to me, do you know of any more?