I'm making some progress, have all parts together now and starting engine assembly.
As this is my first time doing it I could need tips to pay attention to when putting all together.
One important question: Should I put oil on OUTER surfaces of bearing shells (maybe they get better seated when torqued?) or leaving them dry?
Took risk buying a used crank form eBay and got goodone. Then I decided to lighten crank myself "g5 style", I removed dead material from 2. and 6. throw, see attached pictures.
Total mass removed was 0.7kg (from high radius area).
Here tips if somone wants to do it too:
*I used manual saw as much as possible, no heat, no bending to crank, less chance to damage journals accidentally. At the end crank bend stayed same (0.01mm).
*Using angle ginder: dont run crank hot, make pauses, toutch with hand to check temp.
*Think how to place crank in wice to not drop or deform it.
*I took material away only at those two throws, because this way crank internal balance statys same as from factory. Educate yourself what is internal, static and dynamic balance.
*Do one thow at a time from start to end. When first is done go to balancer shop to give it back rough balance, before starting with next. I did not, had perfect two vertical glass surfaces to roll the crank and give it pluss minus 2g (small magnet is useful).
*Dynamic balancing with mashine is a must, it is not a tractor crank! Since it spinns 14k revs, I did pay my balancer operator extra money saying "show me how many gramms is your machine is capable". At 0.15g (or ca. 10gmm units) numbers started to fluctuate (belt and wind influence). Normally shops do some 0.3g or 25gmm for race engine.
*Let them do balancing with generator disk and specially cam sprocket/crank sensor disk attached too. My generator disk was perfect, but other end (crank sensor disk or cam sprocket) was 30gmm off (1g at it's radius).