On the fourth series of engines the crankshaft nose was changed, the articulated connecting rods were strengthened and the accessory drive was changed.
2.
The introduction of articulated connecting rods was regarded as a " nuisance " by Arthur Rubbra, a Rolls-Royce engine designer, as there were inherent problems with the arrangement.
3.
Like the BMW VI and the Mikulin M-17, the AM-34FRN and subsequent models used articulated connecting rods which caused a different stroke of and between right and left cylinder bank.
4.
To ensure adequate bearing surface at the big ends Coatalen retained the articulated connecting rods, where one rod runs on the crankshaft journal, but the other acts indirectly, through a journal on the other rod.
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