by 
wesley
ANSWERS: 6
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It would need to be cylindrical. I don't see what impact it will make if it's not a perfect circle. It's just a piston.
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if its not you engine will not have the proper compression that it should and you will lose horse power and the parts off of the pistion that are still in the clynder are going to put gouges in the cylender wall and ruin you motor. i would not be driving the car or starting it up untill that problem is fixed or else you are going to need a new motor
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I've heard of a couple of motor designs where the cross section is an ellipse.
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no
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as long as the piston and the cylinder,and rings were mated correctly.if the piston,and rings were machined to match the cylinder.they could be square,oblong or whatever shape,the designer wished.
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Although it doesnt have to be a perfect circle, it does however require that the rings have a proper seat so that compression is retained and there is no blowback into the crankcase. You can only achive this if you use an eliptical shape, if you use any shape such as a square, triangle, ect there will be angles that are too acute and the rings will not seal properly. NOTE, this only applys to the piston of a recipricating I/C Engine and not to a rotory (Wankel) engine where the shape is very triangular.
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