Even if you do not run analysis on your engine I believe it is important to understand that the difference in the metalurgy of the rod and main bearing from engine to engine is yet another one of the variables that seems to make some of these engine analysis's here so different from one another .
The current trend from the auto makers is the new Bi-Metal "primarily" Aluminum rod and main bearings . These bearings use less to no lead in the metalurgic make-up .
When you see a Dodge 4.7 throw out little to no copper/bronze in an analysis yet the 4.7 HO Dodge engine does this Bearings used might help explain . The HO engine uses the tried and true Tri-metal bearing most commonly used in hi-performance engines . In the past these offered better embedibility but times have changed .
More on bearing material trends
http://www.aera.org/Members/EngineTech/edge1196/page3.htm
Geeze, might be an ill fated attempt here , brower lost more links and out of time to post however
something to ponder when you see a Ford analysis with ZERO lead and 5w-20 wt oil used is that do you know the exact makeup and percent of lead in the bearings ? Are these engines typically throwing out higher aluminum than a tri-metal bearing engine and making that 5w-20 look really good to those looking at lead as the primary metal of the rod bearing ? Try a google search and see what comes up .
Some engines are now using the Bi metal bearings on the rods and all the mains except the thrust bearing which in this case the old trimetal bearing is used .....all the ducks are not in a row there .
Try googling and many pro written articles on tri-metal and bi-metal bearings will come up .
This info might help understand the differences in UOA's but the links I lost made for an ill fated attempt as I had more to say
but to those interested it might plant the seed needed to produce the need for more info on their engine and bearing type used to aid in decoding your engine oil analysis and possibly even wt of oil used
[ April 30, 2004, 05:36 AM: Message edited by: Motorbike ]
The current trend from the auto makers is the new Bi-Metal "primarily" Aluminum rod and main bearings . These bearings use less to no lead in the metalurgic make-up .
When you see a Dodge 4.7 throw out little to no copper/bronze in an analysis yet the 4.7 HO Dodge engine does this Bearings used might help explain . The HO engine uses the tried and true Tri-metal bearing most commonly used in hi-performance engines . In the past these offered better embedibility but times have changed .
More on bearing material trends
http://www.aera.org/Members/EngineTech/edge1196/page3.htm
Geeze, might be an ill fated attempt here , brower lost more links and out of time to post however
Some engines are now using the Bi metal bearings on the rods and all the mains except the thrust bearing which in this case the old trimetal bearing is used .....all the ducks are not in a row there .
Try googling and many pro written articles on tri-metal and bi-metal bearings will come up .
This info might help understand the differences in UOA's but the links I lost made for an ill fated attempt as I had more to say
[ April 30, 2004, 05:36 AM: Message edited by: Motorbike ]