Quote:
Originally Posted by Synchro909
a) Isn't the thin silvery grey layer of metal on an insert in fact babbit?
b) If that thin layer lasts so long, wouldn't you expect an all babbit bearing to do at least as well?
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a) It used to be but often times there are different materials used today, but yes in theory you are correct.
b) Two or three things factor in on that theory, and the biggest one is the thicker the cast metal is does not necessarily correlate to being the same density. Less dense will not hold-up as well. Also, the ability to transfer heat away from the spinning crankshaft factors in on wear. Again, density factors in on this too as to how well it can transfer the heat into the main web or cap.