Making pistons from scrap aluminum - GIF

Making pistons from scrap aluminum.

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Previously:

https://www.homemadetools.net/forum/...267#post169222
https://www.homemadetools.net/forum/...145#post141459
https://www.homemadetools.net/forum/...017#post168251
https://www.homemadetools.net/forum/...845#post223752
https://www.homemadetools.net/forum/...496#post166517

what are the small holes below the piston rings grooves for?

Quote:

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Originally Posted by desbromilow

what are the small holes below the piston rings grooves for?

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If you are talking about the holes below the oil ring perpendicular to the gudgeon pin, these are to allow lubrication to the piston skirt.

Quote:

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Originally Posted by Frank S

If you are talking about the holes below the oil ring perpendicular to the gudgeon pin, these are to allow lubrication to the piston skirt.

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Frank, Yes - thank you for explaining!!!!!! I figured they were for some type of lubrication, but didn't know what they were lubricating.

thanks again,
Des