Nice job you made
the SKF NJ 207 are able to deal with such job ,with 0.3 mm crank axial play , but not more than 50 hrs having 80 rwhp , reving at 9000 revs/min .
self-aligning ball bearings will let the crank "open" itself , up to failure , they work good with one piece crank .
I was confident that the ratio between pin diameter and length of press fit (web thickness) was the key. These analyzes have shown that the there is a small connection, but not critical. In the model we increased the web thickness from 20mm to 29mm (to what I have access to forgings), but it only reduced the gap in the press fit by 8%. I think that if the crank pin material was of noticably higher E-modulus than the webs, then there would be more to gain from thicker webs. We have also done some models with large diameter crank pin, but that didn't either make a lot of difference. Maybe it's the combination that will do the trick? large pin, even thicker webs, main bearings close to the webs, angular contact bearings and a sturdy crank case? Or start knitting or learn how to play the violin?
That is also an alternative solution. Little bit too much work if these bearings (which drops straight in) will result in a life length of possibly 50 hours.
BTW, Bushie, did you make the bearings inner rings slide on the crank to avoid any axial forces from being applied on them while the crank is bending?
