lazylightning@mail.r
Active Member
Hi!
I'm trying to put together a decent immortal crankshaft. Unpressing and repressing and truing is not the problem. These are knowns. The question is, what size and how many rollers are packed into the space between the conrod and crankpin bigend?
For example, my conrod big end is 22mm inner diameter and the crank pin is 16mm(15.95?) in diameter. The bearings that came out are 3mm in diameter (from the smashed cage). By placing them into the space, I count that I could probably fit about 22 - 24 such roller bearings in there. But how tight will it be? What if, I put in 22 and there isn't enough space for number 23 and there is enough space to be a noticeable gap. Maybe an off size like 2.9 mm is in order to get more in so the last one goes in flush with a pretty tight fit. This is all theoretical of course. I'm planning to use special ceramic racing coatings on all surfaces here which take up only a micron of space or less and dont affect clearances. Then the tungsten disulfide that is burnished in also takes up no space.
Has anybody seen one of these Chinese kits with a crowded roller bearing - big end setup with the crank unpressed and looked closely at this setup? What were the spec.s observed? Has anybody got experience in theoretical clearances for crowded roller bearing setup on conrods for two stroke racing machines?
Thanks in advance
Best Regards,
Paul
I'm trying to put together a decent immortal crankshaft. Unpressing and repressing and truing is not the problem. These are knowns. The question is, what size and how many rollers are packed into the space between the conrod and crankpin bigend?
For example, my conrod big end is 22mm inner diameter and the crank pin is 16mm(15.95?) in diameter. The bearings that came out are 3mm in diameter (from the smashed cage). By placing them into the space, I count that I could probably fit about 22 - 24 such roller bearings in there. But how tight will it be? What if, I put in 22 and there isn't enough space for number 23 and there is enough space to be a noticeable gap. Maybe an off size like 2.9 mm is in order to get more in so the last one goes in flush with a pretty tight fit. This is all theoretical of course. I'm planning to use special ceramic racing coatings on all surfaces here which take up only a micron of space or less and dont affect clearances. Then the tungsten disulfide that is burnished in also takes up no space.
Has anybody seen one of these Chinese kits with a crowded roller bearing - big end setup with the crank unpressed and looked closely at this setup? What were the spec.s observed? Has anybody got experience in theoretical clearances for crowded roller bearing setup on conrods for two stroke racing machines?
Thanks in advance
Best Regards,
Paul