Metal Working: Designing and Making Pistons

Learn the details of pouring, feeding and the solidification of iron and aluminum piston castings so you can do it yourself.

Good casting uses small gates and a low pouring temperature.
The highest number of good castings results from using a combination of small gates and low pouring temperature. Gating Scheme 1: The gates must be no thicker than .6 the wall thickness. 
Illustration Courtesy Chastain Publishing