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Conecting rad

Practical Engine Building

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Do the conecting rad have facing location ?

Rod?

If you're meaning the way the rods face in the engine then it depends on the engine. For an engine where two rods share a common journal on the crankshaft, one side will have a chamfer and this faces the outside where the chamfer clears the journal radius. Otherwise there is no requirement to align the conrod in a specific direction unless the rod uses a forced oil squirter to spray oil against the thrust face of the bore.