17-03-2021, 09:12 AM
ok, no takers..
Well, an update. Very early block. Acid stripped beautifully, but didn't touch the agglomeration between the cylinder walls blocking the flow from side to side. So can, over time, some other sort of material reform which would be chemically inert?
I can't see how this material would have been present in the original cast, and it indeed started to shift when drilled.
One bore also perforated; I think this block was at its limit. It also brings up the issue of how much material is needed and where, for a rebore for liners? This has no cracks in the top face and still has numbers visible there. The side branch supports are also good.
Could re-linering take away ALL the duff material in the centre area of the block, creating an efficient waterflow, but just using the top and bottom of original block to affix the liner?
Well, an update. Very early block. Acid stripped beautifully, but didn't touch the agglomeration between the cylinder walls blocking the flow from side to side. So can, over time, some other sort of material reform which would be chemically inert?
I can't see how this material would have been present in the original cast, and it indeed started to shift when drilled.
One bore also perforated; I think this block was at its limit. It also brings up the issue of how much material is needed and where, for a rebore for liners? This has no cracks in the top face and still has numbers visible there. The side branch supports are also good.
Could re-linering take away ALL the duff material in the centre area of the block, creating an efficient waterflow, but just using the top and bottom of original block to affix the liner?