Why are the pistons in an engine always circular, anyway?

@Motodrachen I was wondering if it was just manufacturing or if there was some performance reason for it, so I suppose that answered that!

Why did they want more than one valve?

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re: CW for length, Mechanical stuff! 

@Motodrachen On the topic of circles in circles, you've reminded me that this website exists: packomania.com/

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