Mike, I am not that familiar with the Jet Central turbine. I haven't a clue as to the size. However I can shed some light on the Wren. It's a Wren 44 electric start. The paper work indicates that it was the first Wren44 built on 23 February 2007 and sent to the original owner on 1 March 2007. The current day price for that engine is $2434 but that includes the British Value added tax. You would deduct the VAT if it was sold to a buyer in the USA. The Wren 54 is an out of production engine. It appears to be electric start also. Can't tell if it's kero start or propane. I'd place the value for that engine around $2K.

Do you go to the Unlimited Hydroplane races in the summer? I had a chance to see the races in Syracuse NY several years ago (they don't come this far east any more). Also happened to be in Seattle during Sea Fair. I love to see them run. They are thrilling to watch and hear even after they switched power to the turbines.