I've just made the cylinder liners for my model V8.
They are bored out to 7.2mm and the OD is just over 8mm for a nice friction fit in the block. I made go-no go gauges to keep the bores consistent to 0.01mm.
![](https://www.model-engineer.co.uk/sites/7/images/member_albums/163849/902614.jpg)
I am not happy with the finish of the bores. I am looking for someway of smoothing/polishing them while maintaining the "roundness" and "parallelness" of the bores.
I am considering turning down a bar to a whisker under bore diameter, charging with an abrasive paste and polishing it that way.
Is that a good idea? And if so, what material for the polisher? A softer metal like ali. or harder like silver steel?
Also, would an axial or radial motion be the way to go?
I was thinking of Eucryl mixed with light oil (a toothpaste powder, I've used it before) followed by Autosol.
Any advice, suggestions or guidance would be much appreciated.
Cheers,
Steve