07-04-2020, 03:45 PM
Mike - thank you for that very clear advice. I shall have to advise the Chassis Register to correct their records.
Chris - thank you too for once again coming to my assistance. I never realised quite how many features had to be machined and measured on a piston. Interesting too that the what looks like a pre-war drawing uses a mix of metric and imperial units, clearly noting a 2.2" cylinder bore but showing piston dimensions in mm, apart from the gudgeon pin lubrication holes that are 1/8" dia! I haven't actually compared the drawing with one of my pistons but, at first sight, they match. I shall now mull over whether or not to drill the additional holes.
Zetomagneto - thanks for the suggestion but these gudgeon pins have no flats on them, which is an argument perhaps for going ahead and drilling the holes.
Regards,
John.
Chris - thank you too for once again coming to my assistance. I never realised quite how many features had to be machined and measured on a piston. Interesting too that the what looks like a pre-war drawing uses a mix of metric and imperial units, clearly noting a 2.2" cylinder bore but showing piston dimensions in mm, apart from the gudgeon pin lubrication holes that are 1/8" dia! I haven't actually compared the drawing with one of my pistons but, at first sight, they match. I shall now mull over whether or not to drill the additional holes.
Zetomagneto - thanks for the suggestion but these gudgeon pins have no flats on them, which is an argument perhaps for going ahead and drilling the holes.
Regards,
John.