Hi Guys, it is not a Lister or a lister clone, they max out at around 10HP. This is something else, basically a Lister style engine on steroids. To achieve 18 HP would require an increase in piston size and stroke, a bigger crankshaft and bearings and probably a lot of modification and reinforcing of the crankcase.
I vaguely remember Gary at Diesel Electric Service experimenting with a big bore Lister style engine with a turbocharger, I wonder if he knows who made and imported this engine.
Looks like 38ac has some experience of this style of engine and some spares.
Bob