eccentricity in bearings - rotary machines

[fvincent]

I refer first to crank sliding bearings. What are the minimum clearance and the minimum eccentricity possible considering the best technology available for a let's say 100HP engine? (4 cylinders at 5000 rpm)

In fact I have in mind some special applications - a kind of gear pump or rotary engine - where eccentricity should be avoided. Any hint? The use of ball/roller bearing could reduce eccentricity for values below 0.01 mm (0.004")or even lower, considering journal load equal to 10kN at 7000 rps?

For wankel engine would be possible/benefical to replace sliding bearing by roller or ball bearings to decrease appex sealing oscillation?

Is there any possible compensation for eccentricity in such applications? I mean dynamical compensation since load vector moves direction constantly between -30o and 30o

Magnetic bearing has a future for car engines?

many questions... sorry

Thanks


fvincent

PS: this thread also in bearing design, manuf. and maint.

fvincent