Originally posted by Pepe J
I think you two guy's discussing automotive piston design are in two different technical era's here. Yes, they use to be of an oval design. I've done my fair share engine rebuilding and some of those piston skirts looked like they were machined with a .030" feed rate and a 500 micron finish.
What do you mean USED TO BE? Auto pistons are oval radially and barrel shaped axially to compensate for expansion of the piston. I operate the machines that finish the O.D.'s of the pistons (as well as the the machines that finish the pin holes and the valve pockets). We have a $250,000 machine in the lab the ONLY checks the ovality and barrel shape. Now they are even starting to make Briggs and Stratton pistons like this as well, they are being made at our LaGrange, GA plant.
What was the topic of the thread again?
