Postby Karl mander » June 13th, 2017, 9:21 pm
Unfortunately running up the engine with the prop and spinner showed excessive run out on the output shaft. I was unaware of this having ran the engine without the large prop and spinner that magnified the run out.
An expensive professional repair attempt followed which didn't really work
Thus I had a massive model airplane that I had built for an engine that didn't work. Bugger.
Fortunately an identical engine minus the cooling fan was on eBay. I decided to take a gamble on it and came up trumps as the internals are like new.
A couple of days of engineering later the new engine now equipped with cooling apparatus burst into life, turning a 37 by 14 prop at 4900rpm. It sounds awesome.
Spinner had been changed to a smaller metal one due to the high rpm.