Thanks K2.Hi Nerd1000. Some of us talk the talk, others get on and do the job! - Excellent stuff! Don't worry about that odd nick from the tool, just make it the location for an oil drilling anyway! How fine did you linish the journals? I'm sure when crank grinding as a teenager, we were using finer than 600 grit, - I think the next may be 1200 grit emery? It was quite expensive stuff as I recall being told! - It came as a big coil of 1" wide... We had a special tool that had a fine adjustment then locking lever arrangement - it used interchangeable jaws that were usually the journal diameter plus a bit, so the linishing emery was clamped "just so" with not a lot of pressure, rotated a dozen or so turns slowly (100~ 200 rpm-ish?) - so on models I use Mole grips for the same task. But I have not made special jaws (Yet) as the "best of my grips" has good flat faces. But we NEVER ran 2 directions for linishing journals. I'm sure the crank grinding was always "clockwise" looking at the timing end (the direction of rotation of the crank in service), and we never had cranks returned (even from Haulage high mileage customers, or car racing guys) for Scuffed journals. We washed the journals (and rinsed oil-ways through) with paraffin before oiling when finished: the clean Paraffin always washed the "smokey" abrasive residue from the finished journal.
When I worked on engines for a major car maker, the Glacier company senior engineer explained the composition of aluminium-tin for the white- "Glacier-metal" shells was selected to have enough silicon (nodules) in the alloy to polish cast iron, without causing undue wear. But I wonder what bearing material you will use? Of course, you are right about the "grinding directionality" of the micro-structure of cast iron shafts. That was a key point about using the aluminium tin bearing shells instead of Phos-bronze metals on cast-iron cranks. - Or so metalurgists and tribologists at both Glacier and Welworthy - and my head office expert - taught me!
Well done on a proper job.
At present I'm planning on using LG2 bronze for my bearings, mostly because it is easy to get and machine. I think I used 600 grit for the polishing, but I can always come back with finer grit to finish up.
The engine is to be splash lubricated so there's no need for an oil drilling in the crankshaft! My plan is to put a scoop on the big end cap with a drilling through to the bearing, this way the big end should get some oil force fed into it every time the scoop splashes into the sump. The mains are more generously sized so they should be able to subsist on the oil mist being flung about in the crankcase, so long as appropriate oil holes are provided.