Just for background interest
http://www.lathes.co.uk/smartbrown/page5.html
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http://www.lathes.co.uk/sabel/
Just for background interest
Your barrel is evidently rather different to mine which has an iron liner pressed directly into the alloy muff. I have an Alfin barrel as well and that's the same.Joker_Bones wrote: ↑Mon Aug 28, 2023 1:03 pm I'd never thought of there being different piston clearances for ally and iron barrels... the ally barrel has a pretty substantial core of what I assume to be iron, will it not behave the same with respect differential expansion between the bore and the piston as an iron barrel?
The chart also gives some typical values for piston ovality... it appears to me more at the at the crown end.
I agree, I in all likelihood the liner in mine has moved a tad, there is no ally to combustion gas interface, the liner is let within the width of the iron core. I understand a head gasket was not used originally on the ally barrel, the head and barrel were lapped together. I have tried that a couple of times but with little long term success and have fitted gaskets.
It may be different... but I thought the ally muff was bonded on by being cast around the iron core, that is the description of the Al-Fin process in this article.