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MaGic_GV
United Kingdom
868 Posts |
 Posted - 28/07/2007 : 17:10:31
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I am in the process of replacing a con rod, and in showing the bits to another old car man, he commented that with white metal bearings he always put a chamfer across the edges of the big end bearing where the cap meets the rod, leaving a bit at each end un-chamfered. The logic is that this picks up oil as it passes the oil hole on the journal and helps distribution. I have not come across this before but it has since been repeated by another friend... any comments?
It could, of course, be that they are Riley men and just want to settle old scores, but I don't think so!
cheers
Graham |
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mgptype
United Kingdom
709 Posts |
Posted - 28/07/2007 : 18:45:45
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Graham
We use to chamfer the white metal rod bearings on the early Austin 7 engines that had the two bearing bent wire crank as the crank use to whip on high revs and run the bearings then they produced a more ridged three bearing engine and broke the crank more often, this had nothing to do with oil distribution but this may apply to the M type and J2's ( two bearing engines ).
Fred |
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g waiting
United Kingdom
730 Posts |
Posted - 29/07/2007 : 10:58:20
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In my copy of "The modern motor engineer" published in 1927 , these grooves are described as for "the collection of sedimentary deposits from the oil." This is probably not essential with modern oil and filtrarion.
Garry |
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MaGic_GV
United Kingdom
868 Posts |
Posted - 30/07/2007 : 16:31:17
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Thanks Gents - I have not seen it mentioned in any Triple-M literature, and the second hand rods I have acquired seem to lack this mod, so I guess its not necessary.
Gary, "the collection of sedimentary deposits from the oil." is similar to the slightly briefer and more anglo saxon description I was given...
cheers
Graham |
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