Summary

Is there a difference in ring end gap in a steel or aluminium engine block? Not really a difference there in the aluminium or the steel block. So there's not a consideration that we need to take into account there in terms of the expansion. This is at least the situation where most aluminium blocks will be running a cast iron sleeve or liner that the rings run against.

00:00 - Sebastien has asked, difference in ring end gap in a steel or aluminium engine block? Not really a difference there in the aluminium or the steel block.
00:12 So there's not a consideration that we need to take into account there in terms of the expansion.
00:18 This is at least the situation where most aluminium blocks will be running a cast iron sleeve or liner that the rings run against.
00:29 So we've still actually got a cast iron surface that the rings are running against, ductile iron surface that the rings are running against.
00:37 There are some late model aluminium blocks however where they are running a coating such as Nikasil directly on the aluminium surface so the rings run against that.
00:47 But those are quite rare and in that situation we are in a little bit of a different situation because we are really forced to use manufacturer's components.
00:56 It's very difficult to bore and hone an aluminium block with a Nikasil coating.
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