The engine incorporates over 10,000 different phrases, pre-recorded by a group of professional voice actors.
These engines incorporate a new injector head design to increase specific impulse.
The designers had aimed at increasing servicing intervals so the engine incorporated both conventional and centrifugal oil filters.
The 660 engine incorporates a five valve cylinder head.
The engine incorporated several innovative features including overhead valves.
All engines incorporated new emissions controls.
Where high-speed steam engines were used, these small engines usually incorporated a single-piece cast iron bed.
Such non-factory engines may also incorporate other upgrades, such as electric starters and electronic ignition.
Such an engine incorporates a piston acted upon by steam alternately on the two sides, hence doubling its power.
The engine also incorporated a low-voltage magneto with make-and-break spark ignition.