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chhitizs

piston seals

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as far as i understand, piston have cast iron seals because of the properties of cast iron, which make it a sealing material. but i was wondering, if the cylinder and piston are both made of cast iron and closely fitted together, could we avoid using seals all together?
friction doesn't depend on surface area, so there shouldn't be extra friction, right?

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Seals are used to avoid the fluid (inside the cylinder) to go out of the combustion chamber. So it has to be perfectly Joined with the cylinder. The More is the surface small, the less is difficult (and expensive) to make it. It would be very difficult to join perfectly the piston and the cylinder. It risks to grip.

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