bearing info

[grumpyvette]

"He claimed the the overly polished surface will cause the oil to flow out between the bearing and the journal too quickly"

 

NO! in fact the flow of oil between the bearing clearances absorbs and transfers heat away from the bearings and the clearances and width of the bearing surface, the end radias, plus the viscosity and pressure of the oil effect the flow far more than the surface finish (within limits of course) but keep in mind that ideally under operation the journals never touch the bearing surfaces because they are seperated by presurized oil. since the pump supplies an endlessly pressurized flow of oil, the only possiable way that the oil can flow out "to QUICKLY" is if its not SUPPLIED FLOWING IN at a SLIGHTLY HIGHER RATE, since PRESURE is a measure of the resistance to FLOW thru those clearances, if it was flowing out too quickly youll have little or no OIL PRESSURE,simply increasing the flow voluum or viscosity will increase the pressure readings, but thats seldom if ever a problem with a correctly set up pump and bearing clearances,in fact thats why your pressure tends to go up as the rpms increase, the pump is a possitive displacement pump, whos voluum increases as the rpms increase but the rate oil can flow thru the clearances does not increase as quickly as the engine speed increases so the resistance to flow increases, IE the pressure goes up!

 

http://www.thirskauto.net/BearingPics.html

 

http://www.babcox.com/editorial/ar/eb20232.htm

 

http://www.babcox.com/editorial/us/us90126.htm

 

http://www.bobistheoilguy.com/bearingwear/bearingwearanalysis.htm

 

http://www.diabolicalperformance.com/clearances.html

 

http://www.babcox.com/editorial/ar/ar20128.htm

 

http://www.micropolishing.com/article1.htm

 

 

the smoother and more consistant in the dia. and surface consistancy the journal has the more actual bearing surface supports weight

 

http://www.manufacturingcenter.com/tooling/archives/0902/0902auto.asp

 

http://www.mmsonline.com/articles/1005ex2.html

 

http://www.chevytalk.org/threads/showfla...78068d0a9d87139

 

the smoother and more consistant in dimension,taper and circumferance the better,the radias on the edge where the journal meets the cranks counter weights must also be consistant

 

these links provide more info

 

http://www.nb-cofrisa.com/docs/web_fallos_ing.PDF

 

http://www.carrilloind.com/tech_archives3.html