BB chevy main bearings ?

[Reed Granrt]

Originally Posted by BlueOval Ralph

If cross drilling and rod drilling is not done at the correct angle for the stroke it ( the cross drilling) will shut oilling to the rods at about 7600 and above.

Hey yall, please dont think I feel I am a know it all on this subject BUT I wont to express/show an observation.. B O Ralph--I feel that this is one reason that there has been many companies to no longer provide cross drilling, the other reason is that it weakens the crank. Most cracks or breaks start from bad radius or hole. With today oils, if you can establish the wedge, it will remain for one revolution until the oil hole reappears. If you have a groove, you never really got a wedge on the main. The reduction in friction comes from the crank riding on the oil molecules and not on the film. Yes you may loose the wedge but you "hopefully" will ride on the film, but riding on the film is not as friction-less as riding in the middle of the wedge. On the firing stroke, I feel you want the mains and the rods to be in the wedge and not on just film. There is only 3 areas in a motor that you can utilize a wedge---rod bearings, main bearings, and cam bearings. Every place else is on a film. Proper use of the wedge will make it almost friction-less(most synthetics), but a film only lessens the load. This is why synthetics, in this instance, is less friction. The oil molecules are like marbles. Man made synthetics have all marbles the same size. Most mineral base oils have all different size marbles, therefore the crank runs on different size marbles and is point contact loaded (it only rides on the large marbles).
I said enough. Got to work see yall
reed