I was disappointed with the engine when after running it for a while it stopped running after a glass hot cylinder disintegrated. I then ran it on12 cylinders and it lasted until the same thing happened and the engine was useless…I then bought another new engine which didn’t have the automatic ignition system or the electric generator which was a shame however the hot pistons are stainless steel and will last.I have persevered with this engine as it is brilliantly designed and made and a clever design for a Stirling Cycle engine.l reiterate that I would love to have the automatic ignition and the electric generator system.