Question about four ring pistons

Thanks

There is also the "false" economy of NOT replacing the sleeves and just using oversize rings. And now you want to further "economize" by useing only the $18 3-ring kit instead of the $22 4-ring kit.

Byte the bullett, eather the 4-ring piston/sleeve rebuild kit or the BETTER 3-ring piston/sleeve rebuild kit sells for the SAME DOLLAR. 3-ring pistons are more EFFICENT. There must be a reason, all modern engines use 3-ring pistons..... ....Dell

I really don't understand what the difference would be. My thought was if you take a four ring piston and do not install the bottom ring wouldn't you end up with a three ringed piston??

Also what keeps a three ring piston from not "slapping"??

I am just trying to get a understanding ..

I agree with you. There is no difference in skirt diameter between a 3- and 4-ring piston, so no slap should be present. The 4th ring is simply for better control of oil consumption.