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bearing info

grumpyvette

Well-known member
Joined
Apr 17, 2001
Messages
841
Location
Loxahatchee, FL, Palm Beach co
"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
t09-186c.jpg

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
 

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