Both engines have rare, locally made, cast alloy marine conversions, including water cooled exhaust manifolds, coolant water reservoir that bolts to the engine thermostat housing, incorporating a mounting for Lees type heat exchanger, separate oil coolers, etc. Mark commented that he had seen this marine conversion on a previous single TS3 engine launch and although that conversion was badly corroded by decades of mindless neglect, the conversions appeared well designed and made. Mark doesn’t know who designed them or where in NZ they were cast, but possibly a long gone foundry in Otahuhu.
Mark has not seen Promethius in person and like us would be keen for an update on the status of the vessel. She does looks very similar to the Wellington based 1968 Owen Woolley launch – Acheron (also twin 140HP TS3 powered), but without Acheron’s 6 foot extension to the stern.