Another disturbing noise from Ruby

[John Mason]

Hello, I have read all the comments on this thread with interest. I have come to the conclusion the noise is either something running tight or without lubrication. As you have eliminated most of the possible causes I like others think it is coming from the rings. It maybe the oil scraper rings are working to well. Try the oil down the bore trick again but run the engine straight away. The oil will lubricate the whole length of the bore as the pistons travel downwards. When I first rebuilt my engine after a rebore the engine squealed for about 20 to 30 seconds until all was lubricated with the oil mist created by the crank.

John Mason.