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In earlier RET-Monitor articles I have written about the application and challenges of lead-free bearings. Until now the focus has been on the main bearing shells, mainly linked to the crankcase main bearing bore shape and split line quality. In this article I will put focus on the application of lead-free bearings in the small end of the con rod, as well as the design features for creating a reliable small end. A number articles, in both Race Engine Technology magazine and here in...

In earlier RET-Monitor articles I have written about the application and challenges of lead-free bearings. Until now the focus has been on the main bearing shells, mainly linked to the crankcase main bearing bore shape and split line quality. In this article I will put focus on the application of lead-free bearings in the small end of the con rod, as well as the design features for creating a reliable small end. A number articles, in both Race Engine Technology magazine and here in...

In previous articles about the differences between leaded and lead-free bearing shell materials, several reservations about the latter have been discussed, one of which is the heat transport from oil through the bearing shell to the crankcase, where leaded bearings are said to have the advantage. In this article, I want to offer further insight into the temperature differences between the two materials. The data here is to be read as relative between the two materials: due to the...